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ARPES Studies of Two-Dimensional Electron Gases at Transition Metal Oxide SurfacesDec 12 2016High mobility two-dimensional electron gases (2DEGs) underpin today's silicon based devices and are of fundamental importance for the emerging field of oxide electronics. Such 2DEGs are usually created by engineering band offsets and charge transfer at ... More

Hybrid Kinematic Control for Rigid Body Pose Stabilization using Dual QuaternionsJan 27 2017Feb 28 2017In this paper, we address the rigid body pose stabilization problem using dual quaternion formalism. We propose a hybrid control strategy to design a switching control law with hysteresis in such a way that the global asymptotic stability of the closed-loop ... More

A weak constraint qualification for conic programs and a problem on duality gapApr 22 2015Apr 23 2015We discuss a weak constraint qualification for conic linear programs and its applications for a few classes of cones. This constraint qualification is used to give a solution to a problem proposed by Shapiro and Z\v{a}linescu and show that if a closed ... More

Amenable cones: error bounds without constraint qualificationsDec 18 2017We provide a framework for obtaining error bounds for linear conic problems without assuming constraint qualifications or regularity conditions. The key aspects of our approach are the notions of amenable cones and facial residual functions. For amenable ... More

The automorphism group and the non-self-duality of $p$-conesAug 05 2018In this paper, we determine the automorphism group of the $p$-cones ($p\neq 2$) in dimension greater than two. In particular, we show that the automorphism group of those $p$-cones are the positive scalar multiples of the generalized permutation matrices ... More

A bound on the Carathéodory numberAug 25 2016The Carath\'eodory number k(K) of a pointed closed convex cone K is the minimum among all the k for which every element of K can be written as a nonnegative linear combination of at most k elements belonging to extreme rays. Carath\'eodory's Theorem gives ... More

The $p$-cones in dimension $n \geq 3$ are not homogeneous when $p\neq 2$Jan 20 2017Aug 01 2017Using the T-algebra machinery we show that, up to linear isomorphism, the only strictly convex homogeneous cones in $\Re^n$ with $n \geq 3$ are the 2-cones, also known as Lorentz cones or second order cones. In particular, this shows that the p-cones ... More

Generalized subdifferentials of spectral functions over Euclidean Jordan algebrasFeb 14 2019This paper is devoted to the study of generalized subdifferentials of spectral functions over Euclidean Jordan algebras. Spectral functions appear often in optimization problems field playing the role of "regularizer", "barrier", "penalty function" and ... More

Control of a two-dimensional electron gas on SrTiO3(111) by atomic oxygenMay 13 2014We report on the formation of a two-dimensional electron gas (2DEG) at the bare surface of (111) oriented SrTiO3. Angle resolved photoemission experiments reveal highly itinerant carriers with a 6-fold symmetric Fermi surface and strongly anisotropic ... More

Band Structure and Spin-Orbital Texture of the (111)-KTaO3 Two-Dimensional Electron GasMar 14 2019Two-dimensional electron gases (2DEGs) in oxides show great potential for discovering new physical phenomena and at the same time hold promise for electronic applications. In this work we use angle resolved photoemission to determine the electronic structure ... More

Fermi arcs and their topological character in the candidate type-II Weyl semimetal MoTe2Apr 27 2016Jul 21 2016We report a combined experimental and theoretical study of the candidate type-II Weyl semimetal MoTe2. Using laser-based angle-resolved photoemission we resolve multiple distinct Fermi arcs on the inequivalent top and bottom (001) surfaces. All surface ... More

Upper limit to magnetism in LaAlO3/SrTiO3 heterostructuresSep 06 2011Using polarized neutron reflectometry (PNR) we measured the neutron spin dependent reflectivity from four LaAlO3/SrTiO3 superlattices. This experiment implies that the upper limit for the magnetization induced by an 11 T magnetic field at 1.7 K is 2 emu/cm3. ... More

Structural, magnetic, and electronic properties of GdTiO3 Mott insulator thin films grown by pulsed laser depositionAug 29 2017We report on the optimization process to synthesize epitaxial thin films of GdTiO3 on SrLaGaO4 substrates by pulsed laser deposition. Optimized films are free of impurity phases and are fully strained. They possess a magnetic Curie temperature TC = 31.8 ... More

Facial Reduction and Partial PolyhedralityDec 08 2015May 14 2018We present FRA-Poly, a facial reduction algorithm (FRA) for conic linear programs that is sensitive to the presence of polyhedral faces in the cone. The main goals of FRA and FRA-Poly are the same, i.e., finding the minimal face containing the feasible ... More

Weak Infeasibility in Second Order Cone ProgrammingSep 17 2015The objective of this work is to study weak infeasibility in second order cone programming. For this purpose, we consider a relaxation sequence of feasibility problems that mostly preserve the feasibility status of the original problem. This is used to ... More

A structural geometrical analysis of weakly infeasible SDPsJul 24 2015Jul 28 2015In this article, we present a geometric theoretical analysis of semidefinite feasibility problems (SDFPs). This is done by decomposing a SDFP into smaller problems, in a way that preserves most feasibility properties of the original problem. With this ... More

Solving SDP Completely with an Interior Point OracleJul 29 2015Nov 16 2015We suppose the existence of an oracle which is able to solve any semidefinite programming (SDP) problem having interior feasible points at both its primal and dual sides. We note that such an oracle might not be able to directly solve general SDPs even ... More

Characterization and space embedding of directed graphs and social networks through magnetic LaplaciansDec 05 2018Dec 09 2018Though commonly found in the real world, directed networks have received relatively less attention from the literature in which concerns their topological and dynamical characteristics. In this work, we develop a magnetic Laplacian-based framework that ... More

Exact augmented Lagrangian functions for nonlinear semidefinite programmingMay 18 2017Jun 26 2018In this paper, we study augmented Lagrangian functions for nonlinear semidefinite programming (NSDP) problems with exactness properties. The term exact is used in the sense that the penalty parameter can be taken appropriately, so a single minimization ... More

Facial Reduction and Partial PolyhedralityDec 08 2015Oct 13 2016We present FRA-Poly, a facial reduction algorithm (FRA) for conic linear programs that is sensitive to the presence of polyhedral faces in the cone. The main goals of FRA and FRA-Poly are the same, i.e., finding the minimal face containing the feasible ... More

Electronic structure of buried LaNiO3 layers in (111)-oriented LaNiO3/LaMnO3 superlattices probed by soft x-ray ARPESNov 25 2016Taking advantage of the large electron escape depth of soft x-ray angle resolved photoemission spectroscopy we report electronic structure measurements of (111)-oriented [LaNiO3/LaMnO3] superlattices and LaNiO3 epitaxial films. For thin films we observe ... More

Absence of Giant Spin Splitting in the Two-Dimensional Electron Liquid at the Surface of SrTiO$_3$ (001)Mar 01 2016We reinvestigate the putative giant spin splitting at the surface of SrTiO$_3$ reported by Santander-Syro $et~al.$ [Nature Mat. 13, 1085 (2014)]. Our spin- and angle-resolved photoemission experiments on (001) oriented surfaces supporting a two-dimensional ... More

Atomically precise lateral modulation of a two-dimensional electron liquid in anatase TiO2 thin filmsMar 01 2017Engineering the electronic band structure of two-dimensional electron liquids (2DELs) confined at the surface or interface of transition metal oxides is key to unlocking their full potential. Here we describe a new approach to tailoring the electronic ... More

Observation of Large Topologically Trivial Fermi-Arcs in the Candidate Type-II Weyl Semimetal WTe2Apr 08 2016Sep 12 2016We report angle-resolved photoemission experiments resolving the distinct electronic structure of the inequivalent top and bottom (001) surfaces of WTe2. On both surfaces, we identify a surface state that forms a large Fermi-arc emerging out of the bulk ... More

Radiofrequency and Mechanical Tests of Silver Coated CuCrZr Contacts for the ITER Ion Cyclotron AntennaOct 10 2017Feb 15 2018The ITER Ion Cyclotron Resonance Heating (ICRH) system is designed to couple to the plasma 20 MW of RF power from two antennas in the 40-55 MHz frequency range during long pulses of up to 3600 s and under various plasma conditions with Edge Localized ... More

Observation of out-of-plane spin texture in a SrTiO3 (111) two-dimensional electron gasJun 05 2018We explore the second order bilinear magnetoelectric resistance (BMER) effect in the d-electron-based two-dimensional electron gas (2DEG) at the SrTiO3 (111) surface. We find an evidence of a spin-split band structure with the archetypal spin-momentum ... More

In-situ strain-tuning of the metal-insulator-transition of Ca$_{2}$RuO$_{4}$ in angle-resolved photoemission experimentsMar 01 2018Oct 24 2018We report the evolution of the $k$-space electronic structure of lightly doped bulk Ca$_{2}$RuO$_{4}$ with uniaxial strain. Using ultrathin plate-like crystals, we achieve strain levels up to $-4.1\%$, sufficient to suppress the Mott phase and access ... More

Mode Structure in Superconducting Metamaterial Transmission Line ResonatorsDec 06 2018Superconducting metamaterials are a promising resource for quantum information science. In the context of circuit QED, they provide a means to engineer on-chip, novel dispersion relations and a band structure that could ultimately be utilized for generating ... More

Collapse of the Mott gap and emergence of a nodal liquid in lightly doped Sr$_2$IrO$_4$Jun 01 2015Superconductivity in underdoped cuprates emerges from an unusual electronic state characterised by nodal quasiparticles and an antinodal pseudogap. The relation between this state and superconductivity is intensely studied but remains controversial. The ... More

Implementation of a two-qubit controlled-U gate based on unconventional geometric phase with a constant gating timeMay 18 2011We propose an alternative scheme to implement a two-qubits Controlled-U gate in the hybrid system atom-$CCA$ (coupled cavities array). Our scheme results in a constant gating time and, with an adjustable qubit-bus coupling (atom-resonator), one can specify ... More

Local approximation of observables and commutator boundsMar 29 2011We discuss conditional expectations that can be used as generalizations of the partial trace for quantum systems with an infinite-dimensional Hilbert space of states.

An extension of Chubanov's algorithm to symmetric conesFeb 05 2017Sep 26 2017In this work we present an extension of Chubanov's algorithm to the case of homogeneous feasibility problems over a symmetric cone K. As in Chubanov's method for linear feasibility problems, the algorithm consists of a basic procedure and a step where ... More

Gene clusters reflecting macrodomain structure respond to nucleoid perturbationsNov 04 2010Focusing on the DNA-bridging nucleoid proteins Fis and H-NS, and integrating several independent experimental and bioinformatic data sources, we investigate the links between chromosomal spatial organization and global transcriptional regulation. By means ... More

Consensus and Products of Random Stochastic Matrices: Exact Rate for Convergence in ProbabilityFeb 28 2012Distributed consensus and other linear systems with system stochastic matrices $W_k$ emerge in various settings, like opinion formation in social networks, rendezvous of robots, and distributed inference in sensor networks. The matrices $W_k$ are often ... More

Hierarchical Spatial Organization of Geographical NetworksJun 27 2007In this work we propose the use of a hirarchical extension of the polygonality index as a means to characterize and model geographical networks: each node is associated with the spatial position of the nodes, while the edges of the network are defined ... More

SLA-aware Interactive Workflow Assistant for HPC Parameter Sweeping ExperimentsNov 09 2016A common workflow in science and engineering is to (i) setup and deploy large experiments with tasks comprising an application and multiple parameter values; (ii) generate intermediate results; (iii) analyze them; and (iv) reprioritize the tasks. These ... More

Optimality conditions for problems over symmetric cones and a simple augmented Lagrangian methodJan 19 2017Aug 31 2017In this work we are interested in nonlinear symmetric cone problems (NSCPs), which contain as special cases nonlinear semidefinite programming, nonlinear second order cone programming and the classical nonlinear programming problems. We explore the possibility ... More

Tunable kinetic proofreading in a model with molecular frustrationSep 22 2011In complex systems, feedback loops can build intricate emergent phenomena, so that a description of the whole system cannot be easily derived from the properties of the individual parts. Here we propose that inter-molecular frustration mechanisms can ... More

Optimality Conditions for Nonlinear Semidefinite Programming via Squared Slack VariablesDec 17 2015In this work, we derive second-order optimality conditions for nonlinear semidefinite programming (NSDP) problems, by reformulating it as an ordinary nonlinear programming problem using squared slack variables. We first consider the correspondence between ... More

High Performance Computing Evaluation A methodology based on Scientific Application RequirementsDec 03 2014High Performance Distributed Computing is essential to boost scientific progress in many areas of science and to efficiently deploy a number of complex scientific applications. These applications have different characteristics that require distinct computational ... More

Kalman Filtering with Intermittent Observations: Weak Convergence to a Stationary DistributionMar 17 2009May 28 2010The paper studies the asymptotic behavior of Random Algebraic Riccati Equations (RARE) arising in Kalman filtering when the arrival of the observations is described by a Bernoulli i.i.d. process. We model the RARE as an order-preserving, strongly sublinear ... More

JobPruner: A Machine Learning Assistant for Exploring Parameter Spaces in HPC ApplicationsFeb 03 2018Feb 14 2018High Performance Computing (HPC) applications are essential for scientists and engineers to create and understand models and their properties. These professionals depend on the execution of large sets of computational jobs that explore combinations of ... More

Submicrometric Films of Surface-Attached Polymer Network with Temperature-Responsive PropertiesApr 12 2016Temperature-responsive properties of surface-attached poly(N-isopropylacrylamide) (PNIPAM) network films with well-controlled chemistry are investigated. The synthesis consists of cross-linking and grafting preformed ene-reactive polymer chains through ... More

Distributed inference over directed networks: Performance limits and optimal designApr 28 2015We find large deviations rates for consensus-based distributed inference for directed networks. When the topology is deterministic, we establish the large deviations principle and find exactly the corresponding rate function, equal at all nodes. We show ... More

Scaling in the Lattice Gas ModelJan 18 2002A good quality scaling of the cluster size distributions is obtained for the Lattice Gas Model using the Fisher's ansatz for the scaling function. This scaling identifies a pseudo-critical line in the phase diagram of the model that spans the whole (subcritical ... More

Coupling the Sorkin-Johnston State to GravityAug 15 2014We consider the dynamics of the Sorkin-Johnston (SJ) state for a massless scalar field in two dimensions. We conduct a study of the renormalized stress-tensor by a subtraction procedure, and compare the results with those of the conformal vacuum, with ... More

Microfocus laser-ARPES on encapsulated mono-, bi-, and few-layer 1T'-WTe$_2$Nov 12 2018Two-dimensional crystals of semimetallic van der Waals materials hold much potential for the realization of novel phases, as exemplified by the recent discoveries of a polar metal in few layer 1T'-WTe$_2$ and of a quantum spin Hall state in monolayers ... More

Testing the isotropy of the Universe with type Ia supernovae in a model-independent wayNov 16 2017In this paper, we study an anisotropic universe model with Bianchi-I metric using Joint Light-curve Analysis (JLA) sample of type Ia supernovae (SNe Ia). Because light-curve parameters of SNe Ia vary with different cosmological models and SNe Ia samples, ... More

The H-index Paradox: Your Coauthors Have a Higher H-index than You DoOct 16 2015Oct 19 2015One interesting phenomenon that emerges from the typical structure of social networks is the friendship paradox. It states that your friends have on average more friends than you do. Recent efforts have explored variations of it, with numerous implications ... More

JobPruner: A Machine Learning Assistant for Exploring Parameter Spaces in HPC ApplicationsFeb 03 2018Feb 06 2018High Performance Computing (HPC) applications are essential for scientists and engineers to create and understand models and their properties. These professionals depend on the execution of large sets of computational jobs that explore combinations of ... More

Signals of bimodality in the fragmentation of Au quasi-projectilesApr 01 2008Signals of bimodality have been investigated in experimental data of quasi-projectile decay produced in Au+Au collisions at 35 AMeV. This same data set was already shown to provide several signals characteristic of a first order, liquid-gas-like phase ... More

Bimodal pattern in the fragmentation of Au quasi-projectilesDec 29 2006Signals of bimodality have been investigated in experimental data of quasi-projectile decay produced in Au+Au collisions at 35 AMeV. This same data set was already shown to present several signals characteristic of a first order, liquid-gas-like phase ... More

Tailoring the nature and strength of electron-phonon interactions in the SrTiO$_3$(001) two-dimensional electron liquidJun 03 2015Feb 19 2016Surfaces and interfaces offer new possibilities for tailoring the many-body interactions that dominate the electrical and thermal properties of transition metal oxides. Here, we use the prototypical two-dimensional electron liquid (2DEL) at the SrTiO$_3$(001) ... More

On the Reliability Function of the Discrete Memoryless Relay ChannelApr 12 2013Dec 23 2014Bounds on the reliability function for the discrete memoryless relay channel are derived using the method of types. Two achievable error exponents are derived based on partial decode-forward and compress-forward which are well-known superposition block-Markov ... More

Duality Relations for Potts Correlation FunctionsFeb 10 1997Duality relations are obtained for correlation functions of the q-state Potts model on any planar lattice or graph using a simple graphical analysis. For the two-point correlation we show that the correlation length is precisely the surface tension of ... More

Dimers on two-dimensional latticesMar 13 2003Apr 16 2003We consider close-packed dimers, or perfect matchings, on two-dimensional regular lattices. We review known results and derive new expressions for the free energy, entropy, and the molecular freedom of dimers for a number of lattices including the simple-quartic ... More

Two exactly soluble lattice models in three dimensionsMay 26 1998As a prelude to what might be expected as forthcoming breakthroughs in finding new approaches toward solving three-dimensional lattice models in the twenty-first century, we review the exact solutions of two lattice models in three dimensions obtained ... More

On Sobolev orthogonal polynomialsMar 25 2014Sobolev orthogonal polynomials have been studied extensively in the past 20 years. The research in this field has sprawled into several directions and generates a plethora of publications. This paper contains a survey of the main developments up to now. ... More

Electromagnetic Decays of Hyperons (II)Oct 23 1992Excited negative parity hyperon masses are calculated in a chiral bag model in which the pion and the kaon fields are treated as perturbations. We also calculate the hadronic widths of $\lama$ and $\lamb$ as well as the coupling constants of the lightest ... More

Search for Missing Charmonium States in B-meson DecaysJun 01 2002The recent progress in experiments at B-factories suggests an opportunity to search for missing charmonium states $\eta_{c}'(2^1S_0)$ and $h_c(1^1P_1)$. The feasibility of such a search in B-meson decays are discussed.

Professor C. N. Yang and Statistical MechanicsOct 09 2010Professor Chen Ning Yang has made seminal and influential contributions in many different areas in theoretical physics. This talk focuses on his contributions in statistical mechanics, a field in which Professor Yang has held a continual interest for ... More

A Combinatorial Proof of the Enumeration of Alternating Permutations with Given Peak SetApr 05 2012Using the correspondence between a cycle up-down permutation and a pair of matchings, we give a combinatorial proof of the enumeration of alternating permutations according to the given peak set.

GRB Cosmology and Self-organized Criticality in GRBsJul 14 2015Jul 17 2015Gamma-ray bursts (GRBs), which have isotropic energy up to $10^{54}$ erg, would be the ideal tool to study the properties of early universe: including dark energy, star formation rate, and the metal enrichment history of the Universe. We will briefly ... More

The high-redshift star formation rate derived from GRBs: possible origin and cosmic reionizationJan 23 2014The collapsar model of long gamma-ray bursts (GRBs) indicates that they may trace the star formation history. So long GRBs may be a useful tool of measuring the high-redshift star formation rate (SFR). The collapsar model explains GRB formation via the ... More

Moderate-Deviations of Lossy Source Coding for Discrete and Gaussian SourcesNov 09 2011May 10 2012We study the moderate-deviations (MD) setting for lossy source coding of stationary memoryless sources. More specifically, we derive fundamental compression limits of source codes whose rates are $R(D) \pm \epsilon_n$, where $R(D)$ is the rate-distortion ... More

Asymptotic Estimates in Information Theory with Non-Vanishing Error ProbabilitiesApr 10 2015This monograph presents a unified treatment of single- and multi-user problems in Shannon's information theory where we depart from the requirement that the error probability decays asymptotically in the blocklength. Instead, the error probabilities for ... More

The Pfaffian solution of a dimer-monomer problem: Single monomer on the boundaryJul 25 2006We consider the dimer-monomer problem for the rectangular lattice. By mapping the problem into one of close-packed dimers on an extended lattice, we rederive the Tzeng-Wu solution for a single monomer on the boundary by evaluating a Pfaffian. We also ... More

On Dispersions of Discrete Memoryless Channels with Noncausal State Information at the EncoderApr 02 2012Nov 12 2013In this paper, we study the finite blocklength limits of state-dependent discrete memoryless channels where the discrete memoryless state is known noncausally at the encoder. For the point-to-point case, this is known as the Gel'fand-Pinsker channel model. ... More

Error and Erasure Exponents for the Broadcast Channel with Degraded Message SetsJan 27 2015Error and erasure exponents for the broadcast channel with degraded message sets are analyzed. The focus of our error probability analysis is on the main receiver where, nominally, both messages are to be decoded. A two-step decoding algorithm is proposed ... More

New critical frontiers for the Potts and percolation modelsJan 08 2006We obtain the critical threshold for a host of Potts and percolation models on lattices having a structure which permits a duality consideration. The consideration generalizes the recently obtained thresholds of Scullard and Ziff for bond and site percolation ... More

Self-dual property of the Potts model in one dimensionMay 23 1998May 26 1998A new duality relation is derived for the Potts model in one dimension. It is shown that the partition function is self-dual with the nearest-neighbor interaction and the external field appearing as dual parameters. Zeroes of the partition function are ... More

Spherical HarmonicsApr 09 2013This is Chapter 1 of the book {\it Approximation Theory and Harmonic Analysis on Spheres and Balls} by the authors. It provides a self-contained introduction to spherical harmonics. The book will be published as a title in {\it Springer Monographs in ... More

Discovering Classes of Strongly Equivalent Logic ProgramsOct 12 2011In this paper we apply computer-aided theorem discovery technique to discover theorems about strongly equivalent logic programs under the answer set semantics. Our discovered theorems capture new classes of strongly equivalent logic programs that can ... More

Finding Optimal Sinks for Random Walkers in a NetworkApr 07 2017In a model of network communication based on a random walk in an undirected graph, what subset of nodes (subject to constraints on the set size), enables the fastest spread of information? In this paper, we assume the dynamics of spread is described by ... More

A Formula for the Capacity of the General Gel'fand-Pinsker ChannelOct 03 2012Apr 16 2014We consider the Gel'fand-Pinsker problem in which the channel and state are general, i.e., possibly non-stationary, non-memoryless and non-ergodic. Using the information spectrum method and a non-trivial modification of the piggyback coding lemma by Wyner, ... More

Time evolution and decoherence of a spin-1/2 particle coupled to a spin bath in thermal equilibriumOct 10 2007The time evolution of a spin-1/2 particle under the influence of a locally applied external magnetic field, and interacting with anisotropic spin environment in thermal equilibrium at temperature $T$ is studied. The exact analytical form of the reduced ... More

Critical frontier of the Potts and percolation models in triangular-type and kagome-type lattices I: Closed-form expressionsNov 13 2009We consider the Potts model and the related bond, site, and mixed site-bond percolation problems on triangular-type and kagome-type lattices, and derive closed-form expressions for the critical frontier. For triangular-type lattices the critical frontier ... More

Theory of resistor networks: The two-point resistanceFeb 14 2004Feb 19 2004The resistance between arbitrary two nodes in a resistor network is obtained in terms of the eigenvalues and eigenfunctions of the Laplacian matrix associated with the network. Explicit formulas for two-point resistances are deduced for regular lattices ... More

Pattern Count on Multiply Restricted PermutationsFeb 17 2013Previous work has studied the pattern count on singly restricted permutations. In this work, we focus on patterns of length 3 in multiply restricted permutations, especially for double and triple pattern-avoiding permutations. We derive explicit formulae ... More

Precise peculiar velocities from gravitational waves accompanied by electromagnetic signals and cosmological applicationsOct 17 2017Aug 26 2018Peculiar velocities are a precious tool to study the large-scale distribution of matter in the local universe and test cosmological models. However, present measurements of peculiar velocities are based on empirical distance indicators, which introduce ... More

Non-collinear magnetic ordering in compressed FePd$_3$ ordered alloy: a first principles studyOct 19 2012Dec 14 2012By means of ab initio calculations based on the density functional theory we investigated magnetic phase diagram of ordered FePd$_3$ alloy as a function of external pressure. Considering several magnetic configurations we concluded that the system under ... More

Evidence for Merger Remnants in Early-Type Host Galaxies of Low-Redshift QSOsJan 06 2008We present results from a pilot HST ACS deep imaging study in broad-band V of five low-redshift QSO host galaxies classified in the literature as ellipticals. The aim of our study is to determine whether these early-type hosts formed at high redshift ... More

From bi-layer to tri-layer Fe nanoislands on Cu3Au(001)Sep 24 2001Self assembly on suitably chosen substrates is a well exploited root to control the structure and morphology, hence magnetization, of metal films. In particular, the Cu3Au(001) surface has been recently singled out as a good template to grow high spin ... More

An entropy-based approach to automatic image segmentation of satellite imagesNov 09 2009An entropy-based image segmentation approach is introduced and applied to color images obtained from Google Earth. Segmentation refers to the process of partitioning a digital image in order to locate different objects and regions of interest. The application ... More

State-to-state vibrational kinetics of H$_2$ and H$_2^+$ in a post-shock cooling gas with primordial compositionFeb 10 2016The radiative cooling of shocked gas with primordial chemical composition is an important process relevant to the formation of the first stars and structures, as well as taking place also in high velocity cloud collisions and supernovae explosions. Among ... More

Reconnection outflow generated turbulence in the solar windNov 28 2014Petschek-type time-dependent reconnection (TDR) and quasi-stationary reconnection (QSR) models are considered to understand reconnection outflow structures and the features of the associated locally generated turbulence in the solar wind. We show that ... More

On universal decoherence under gravity: a perspective through the Equivalence PrincipleMar 07 2016In Nature Phys. 11, 668 (2015) (Ref. [1]), a composite particle prepared in a pure initial quantum state and propagated in a uniform gravitational field is shown to undergo a decoherence process at a rate determined by the gravitational acceleration. ... More

Fueling QSOs: The Relevance of MergersJul 21 2008To study the relevance of mergers for the fueling of QSOs, we are currently conducting an HST imaging campaign of a sample of QSO host galaxies classified as ellipticals in the literature. Here, we present results from a study of the first five QSO host ... More

A Soluble Free-Fermion Model in d DimensionsDec 05 1994Dec 09 1994We consider a vertex model in d dimensions characterized by lines which run in a preferred direction. We show that this vertex model is soluble if the weights of vertices with intersecting lines are given by a free-fermion condition, and that a fugacity ... More

Lensing of Fast Radio Bursts by Binaries to Probe Compact Dark MatterJan 23 2018Jan 26 2018The possibility that a fraction of the dark matter is comprised of massive compact halo objects (MACHOs) remains unclear, especially in the 20-100 $M_{\odot}$ window. MACHOs could make up binaries, whose mergers may be detected by LIGO as gravitational ... More

High-resolution photoemission on Sr2RuO4 reveals correlation-enhanced effective spin-orbit coupling and dominantly local self-energiesDec 16 2018We explore the interplay of electron-electron correlations and spin-orbit coupling in the model Fermi liquid Sr2RuO4 using laser-based angle-resolved photoemission spectroscopy. Our precise measurement of the Fermi surface confirms the importance of spin-orbit ... More

Separating Different Models from Measuring $α, β, γ$Jan 13 2000Jan 31 2000New physics effects on the $B^0-\bar{B}^0$ mixing and B-decay amplitudes are discussed. By a combined analysis, the model of new physics can be partially distinguished.It is emphasized that the extraction of unitarity angles $\beta$ and $\gamma$ through ... More

Lepton flavor-changing Scalar Interactions and Muon $g-2$Oct 23 2001Jan 16 2003A systematic investigation on muon anomalous magnetic moment and related lepton flavor-violating process such as $\m\to e\g$, $\t\to e\g$ and $\t\to \m\g$ is made at two loop level in the models with flavor-changing scalar interactions. The two loop diagrams ... More

Approximate and pseudo-amenability of various classes of Banach algebrasJan 22 2008Feb 14 2009We continue the investigation of notions of approximate amenability that were introduced in work of the second and third authors. It is shown that every boundedly approximately contractible Banach algebra has a bounded approximate identity. Among our ... More

Andreev Reflection Spectroscopy in Niobium Point Contacts in Magnetic FieldOct 11 2004Feb 05 2005The Blonder-Tinkham-Klapwijk model of the Point-Contact Andreev Reflection spectroscopy does not provide an adequate description of experiment in the presence of magnetic field. We demonstrate this using a junction between a niobium tip and a copper film. ... More

New sum rule identities and duality relation for the Potts $n$-point correlation functionJun 25 1997It is shown that certain sum rule identities exist which relate correlation functions for $n$ Potts spins on the boundary of a planar lattice for $n\geq 4$. Explicit expressions of the identities are obtained for $n=4,5$. It is also shown that the identities ... More

$F^0-\bar{F}^0 $ Mixing and CP Violation in the General Two Higgs Doublet ModelJun 10 1999Jun 14 1999A phenomenological analysis of the general two Higgs doublet model is presented. Possible constraints of the Yukawa couplings are obtained from the $K^0-\bar{K}^0, B^0-\bar{B}^0$ and $D^0-\bar{D}^0$ mixings. A much larger $D^0-\bar{D}^0$ mixing than the ... More

Searching for strange quark matter objects in exoplanetsFeb 26 2017Sep 13 2017The true ground state of hadronic matter may be strange quark matter (SQM). Consequently, the observed pulsars may actually be strange quark stars, but not neutron stars. However, proving or disproving the SQM hypothesis still remains to be a difficult ... More

Reduced spin-down rate of PSR J0738-4042 explained as due to an asteroid disruption eventMar 05 2015Long term observations by Brook et al. reveal that the derivative of rotational frequency of PSR J0738-4042 changed abruptly in 2005. Originally, the spin-down rate was relatively stable, with the rotational frequency derivative of $-1.14 \times 10^{-14}~\rm ... More

The Initial Mass Function of the Massive Star-forming Region NGC 3603 from Near-Infrared Adaptive Optics observationsOct 15 2007Mar 09 2008We study the initial mass function (IMF) of one of the most massive Galactic star-forming regions NGC 3603 to answer a fundamental question in current astrophysics: is the IMF universal, or does it vary? Using our very deep, high angular resolution JHKsL' ... More