Latest in cond-mat.dis-nn
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The Random Fractional Matching ProblemFeb 08 2018We consider two formulations of the random-link fractional matching problem, a relaxed version of the more standard random-link (integer) matching problem. In one formulation, we allow each node to be linked to itself in the optimal matching configuration. ... More Spin-charge separation and many-body localizationFeb 07 2018Many body localization for a disordered chain of spin 1/2 fermions is discussed. Following [Phys. Rev. B \textbf{94}, 241104 (2016)], we discuss the case of correlated disorder for both spin components, a system that leads to density (charge) localization ... More Solution for a Bipartite Euclidean TSP in one dimensionFeb 05 2018The travelling salesman problem is one of the most studied combinatorial optimization problems, because of the simplicity in its statement and the difficulty in its solution. We characterize the optimal cycle for every convex and increasing cost function ... More Multilayer Network Modeling of Integrated Biological SystemsFeb 05 2018Biological systems, from a cell to the human brain, are inherently complex. A powerful representation of such systems, described by an intricate web of relationships across multiple scales, is provided by complex networks. Recently, several studies are ... More Dense Power-law Networks and Simplicial ComplexesFeb 05 2018There is increasing evidence that dense networks occur in on-line social networks, recommendation networks and in the brain. In addition to being dense, these networks are often also scale-free, i.e. their degree distributions follow $P(k)\propto k^{-\gamma}$ ... More Complex Network Geometry and Frustrated SynchronizationFeb 01 2018The dynamics of networks of neuronal cultures has been recently shown to be strongly dependent on the network geometry and in particular on their dimensionality. However, this phenomenon has been so far mostly unexplored from the theoretical point of ... More Bimeron nanoconfined designJan 24 2018We report on the stabilization of the topological bimeron excitations in confined geometries. The Monte Carlo simulations for a ferromagnet with a strong Dzyaloshinskii-Moriya interaction revealed the formation of a mixed skyrmion-bimeron phase. The vacancy ... More Many-body localization, symmetry, and topologyJan 23 2018We review recent developments in the study of out-of-equilibrium topological states of matter in isolated systems. The phenomenon of many-body localization, exhibited by some isolated systems usually in the presence of quenched disorder, prevents systems ... More The quasi-periodic quantum Ising transition in 1DJan 22 2018Unlike random potentials, quasi-periodic modulation can induce localisation-delocalisation transitions in one dimension. In this article, we analyse the implications of this for symmetry breaking in the quasi-periodically modulated quantum Ising chain. ... More Do the surface Fermi arcs in Weyl semimetals survive disorder?Jan 16 2018We theoretically study the topological robustness of the surface physics induced by Weyl Fermi-arc surface states in the presence of short-ranged quenched disorder and surface-bulk hybridization. This is investigated with numerically exact calculations ... More Applications of deep learning to relativistic hydrodynamicsJan 10 2018Relativistic hydrodynamics is a powerful tool to simulate the evolution of the quark gluon plasma (QGP) in relativistic heavy ion collisions. Using 10000 initial and final profiles generated from 2+1-d relativistic hydrodynamics VISH2+1 with MC-Glauber ... More Structural Covariance in the Hard Sphere FluidDec 22 2017Feb 01 2018We study the joint variability of structural information in a hard sphere fluid biased to avoid crystallisation and form fivefold symmetric geometric motifs. We show that the structural covariance matrix approach, originally proposed for on-lattice liquids ... More Softening and Yielding of Soft Glassy MaterialsNov 20 2017Solids deform and fluids flow, but soft glassy materials, such as emulsions, foams, suspensions, and pastes, exhibit an intricate mix of solid and liquid-like behavior. While much progress has been made to understand their elastic (small strain) and flow ... More Signatures of the Many-body Localized Regime in Two DimensionsNov 07 2017Lessons from Anderson localization highlight the importance of dimensionality of real space for localization due to disorder. More recently, studies of many-body localization have focussed on the phenomena in one dimension using techniques of exact diagonalization ... More Machine learning vortices at the Kosterlitz-Thouless transitionOct 26 2017Efficient and automated classification of phases from minimally processed data is one goal of machine learning in condensed matter and statistical physics. Supervised algorithms trained on raw samples of microstates can successfully detect conventional ... More Non-identical multiplexing promotes chimera statesAug 02 2017Nov 08 2017We present the emergence of chimeras, a state referring to coexistence of partly coherent, partly incoherent dynamics in networks of identical oscillators, in a multiplex network consisting of two non-identical layers which are interconnected. We demonstrate ... More Microscopic processes controlling the Herschel-Bulkley exponentAug 01 2017Jan 15 2018The flow curve of various yield stress materials is singular as the strain rate vanishes, and can be characterized by the so-called Herschel-Bulkley exponent $n=1/\beta$. A mean-field approximation due to Hebraud and Lequeux (HL) assumes mechanical noise ... More Behaviour of l-bits near the many-body localization transitionJul 17 2017Eigenstates of fully many-body localized (FMBL) systems are described by quasilocal operators $\tau_i^z$ (l-bits), which are conserved exactly under Hamiltonian time evolution. The algebra of the operators $\tau_i^z$ and $\tau_i^x$ associated with l-bits ... More Quantum phase recognition via unsupervised machine learningJul 03 2017The application of state-of-the-art machine learning techniques to statistical physic problems has seen a surge of interest for their ability to discriminate phases of matter by extracting essential features in the many-body wavefunction or the ensemble ... More Comments on the Random Thirring ModelFeb 16 2017Mar 21 2017The Thirring model with random couplings is a translationally invariant generalisation of the SYK model to 1+1 dimensions, which is tractable in the large N limit. We compute its two point function, at large distances, for any strength of the random coupling. ... More Learning Criticality in an Embodied Boltzmann MachineFeb 02 2017Many biological and cognitive systems do not operate deep into one or other regime of activity. Instead, they exploit critical surfaces poised at transitions in their parameter space. The pervasiveness of criticality in natural systems suggests that there ... More Quantum subdiffusion with two- and three-body interactionsDec 07 2016We study the dynamics of a few-quantum-particle cloud in the presence of two- and three-body interactions in weakly disordered one-dimensional lattices. The interaction is dramatically enhancing the Anderson localization length $\xi_1$ of noninteracting ... More Anderson localization in open systemsDec 05 2016Dec 08 2016In an isolated single-particle quantum system a spatial disorder can induce Anderson localization. Being a result of interference, this phenomenon is expected to be fragile in the face of dissipation. Here we show that dissipation can drive a disordered ... More Anderson localization in open systemsDec 05 2016In an isolated single-particle quantum system a spatial disorder can induce Anderson localization. Being a result of interference, this celebrated phenomenon is expected to be fragile in the face of environment-induced dissipation and it is commonly believed ... More Dielectric Relaxation Dynamics and the Boson Peak of WaterDec 05 2016By combining dielectric, THz and far-infrared techniques, we have collected temperature-dependent broadband dielectric spectra of water and aqueous LiCl solutions extending up to 20 THz. We demonstrate that the spectral features observed in pure water ... More Theory of deflagration in disordered mediaDec 02 2016The conventional theory of burning works well in the case of uniform media where all system parameters are spatially independent. We develop a theory of burning in disordered media. In this case, rare regions (hot spots) where the burning process is more ... More Tunable edge states and their robustness towards disorderNov 30 2016The interest in the properties of edge states in Chern insulators and in $\mathbb{Z}_2$ topological insulator has increased rapidly in recent years. We present calculations on how to influence the transport properties of chiral and helical edge states ... More Finite size scaling study of a two parameter percolation modelNov 29 2016A two parameter percolation model with nucleation and growth of finite clusters is developed taking the initial seed concentration \rho and a growth parameter g as two tunable parameters. Percolation transition is determined by the final static configuration ... More Stochastic Thermodynamics of LearningNov 28 2016Virtually every organism gathers information about its noisy environment and builds models from that data, mostly using neural networks. Here, we use stochastic thermodynamics to analyse the learning of a classification rule by a neural network. We show ... More Self-Learning Monte Carlo Method in Fermion SystemsNov 28 2016We develop the self-learning Monte Carlo (SLMC) method, a general-purpose numerical method recently introduced to simulate many-body systems, for studying interacting fermion systems. Our method uses a highly-efficient update algorithm, which we design ... More Polaronic quantum diffusion in dynamic localization regimeNov 28 2016We investigate the quantum dynamics in a disordered electronic lattice with Fibonacci sequence of site energy and off-diagonal electron-phonon coupling within a sub-Ohmic bath by the time-dependent density matrix renormalization group algorithm. It is ... More Epidemic spreading and bond percolation in multilayer networksNov 26 2016The Susceptible-Infected-Recovered (SIR) model is studied in multilayer networks with arbitrary number of links across the layers. By following the mapping to bond percolation we give the exact expression for the epidemic threshold and the fraction of ... More How does cell size regulation affect population growth?Nov 23 2016The proliferation of a growing microbial colony is well characterized by the population growth rate. However, at the single-cell level, isogenic cells often exhibit different cell-cycle durations. For evolutionary dynamics, it is thus important to establish ... More Self-averaging in the random 2D Ising ferromagnetNov 23 2016We study sample-to-sample fluctuations in a critical two-dimensional Ising model with quenched random ferromagnetic couplings. Using replica calculations in the renormalization group framework we derive explicit expressions for the probability distribution ... More Spectral correlations in finite-size Anderson insulatorsNov 22 2016We investigate spectral correlations in quasi one-dimensional Anderson insulators with broken time-reversal symmetry. While energy levels are uncorrelated in the thermodynamic limit of infinite wire-length, some correlations remain in finite-size Anderson ... More Structure and dynamics of the t154 lattice glassNov 21 2016We revisit the $t154$ variant of the Biroli-Mezard lattice glass, complementing previous studies by studying statics and dynamics under periodic boundary conditions as well as systems confined in cavities with amorphous boundaries. We compute the point-to-se ... More