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Temperature-dependent criticality in random 2D Ising models: We consider 2D random Ising ferromagnetic models, where quenched disorder is
represented either by random local magnetic fields (Random Field Ising Model)
or by a random distribution of interaction couplings (Random Bond Ising Model).
In both cases we first p... | cond-mat_dis-nn |
Dynamics of weakly coupled random antiferromagnetic quantum spin chains: We study the low-energy collective excitations and dynamical response
functions of weakly coupled random antiferromagnetic spin-1/2 chains. The
interchain coupling leads to Neel order at low temperatures. We use the
real-space renormalization grou... | cond-mat_dis-nn |
The Exponential Capacity of Dense Associative Memories: Recent generalizations of the Hopfield model of associative memories are able
to store a number $P$ of random patterns that grows exponentially with the
number $N$ of neurons, $P=\exp(\alpha N)$. Besides the huge storage capacity,
another interesting feature of th... | cond-mat_dis-nn |
Renormalization of Oscillator Lattices with Disorder: A real-space renormalization transformation is constructed for lattices of
non-identical oscillators with dynamics of the general form
$d\phi_{k}/dt=\omega_{k}+g\sum_{l}f_{lk}(\phi_{l},\phi_{k})$. The
transformation acts on ensembles of such lattices. Critical prope... | cond-mat_dis-nn |
Numerical verification of universality for the Anderson transition: We analyze the scaling behavior of the higher Lyapunov exponents at the
Anderson transition. We estimate the critical exponent and verify its
universality and that of the critical conductance distribution for box,
Gaussian and Lorentzian distributions ... | cond-mat_dis-nn |
Spectral description of the dynamics of ultracold interacting bosons in
disordered lattices: We study the dynamics of a nonlinear one-dimensional disordered system from a
spectral point of view. The spectral entropy and the Lyapunov exponent are
extracted from the short time dynamics, and shown to give a pertinent
ch... | cond-mat_dis-nn |
Creep motion of an elastic string in a random potential: We study the creep motion of an elastic string in a two dimensional pinning
landscape by Langevin dynamics simulations. We find that the Velocity-Force
characteristics are well described by the creep formula predicted from
phenomenological scaling arguments. We a... | cond-mat_dis-nn |
Analysis of Many-body Localization Landscapes and Fock Space Morphology
via Persistent Homology: We analyze functionals that characterize the distribution of eigenstates in
Fock space through a tool derived from algebraic topology: persistent homology.
Drawing on recent generalizations of the localization landscape a... | cond-mat_dis-nn |
Structure and Relaxation Dynamics of a Colloidal Gel: Using molecular dynamics computer simulations we investigate the structural
and dynamical properties of a simple model for a colloidal gel at low volume
fraction. We find that at low T the system is forming an open percolating
cluster, without any sign of a phase se... | cond-mat_dis-nn |
Probing tails of energy distributions using importance-sampling in the
disorder with a guiding function: We propose a simple and general procedure based on a recently introduced
approach that uses an importance-sampling Monte Carlo algorithm in the disorder
to probe to high precision the tails of ground-state energy ... | cond-mat_dis-nn |
Statistical Properties of the one dimensional Anderson model relevant
for the Nonlinear Schrödinger Equation in a random potential: The statistical properties of overlap sums of groups of four eigenfunctions
of the Anderson model for localization as well as combinations of four
eigenenergies are computed. Some of the... | cond-mat_dis-nn |
Tower of quantum scars in a partially many-body localized system: Isolated quantum many-body systems are often well-described by the eigenstate
thermalization hypothesis. There are, however, mechanisms that cause different
behavior: many-body localization and quantum many-body scars. Here, we show how
one can find diso... | cond-mat_dis-nn |
Delocalization of topological surface states by diagonal disorder in
nodal loop semimetals: The effect of Anderson diagonal disorder on the topological surface
(``drumhead'') states of a Weyl nodal loop semimetal is addressed. Since
diagonal disorder breaks chiral symmetry, a winding number cannot be defined.
Seen as... | cond-mat_dis-nn |
Probing the dynamics of Anderson localization through spatial mapping: We study (1+1)D transverse localization of electromagnetic radiation at
microwave frequencies directly by two-dimensional spatial scans. Since the
longitudinal direction can be mapped onto time, our experiments provide unique
snapshots of the build-... | cond-mat_dis-nn |
Supermetallic and Trapped States in Periodically Kicked Lattices: A periodically driven lattice with two commensurate spatial periodicities is
found to exhibit super metallic states characterized by enhancements in wave
packet spreading and entropy. These resonances occur at critical values of
parameters where multi-ba... | cond-mat_dis-nn |
Multifractality of ab initio wave functions in doped semiconductors: In Refs. [1,2] we have shown how a combination of modern linear-scaling DFT,
together with a subsequent use of large, effective tight-binding Hamiltonians,
allows to compute multifractal wave functions yielding the critical properties
of the Anderson ... | cond-mat_dis-nn |
Coexistence of localization and transport in many-body two-dimensional
Aubry-André models: Whether disordered and quasiperiodic many-body quantum systems host a
long-lived localized phase in the thermodynamic limit has been the subject of
intense recent debate. While in one dimension substantial evidence for the
exis... | cond-mat_dis-nn |
Failure Probabilities and Tough-Brittle Crossover of Heterogeneous
Materials with Continuous Disorder: The failure probabilities or the strength distributions of heterogeneous 1D
systems with continuous local strength distribution and local load sharing have
been studied using a simple, exact, recursive method. The f... | cond-mat_dis-nn |
Crossovers in ScaleFree Networks on Geographical Space: Complex networks are characterized by several topological properties: degree
distribution, clustering coefficient, average shortest path length, etc. Using
a simple model to generate scale-free networks embedded on geographical space,
we analyze the relationship b... | cond-mat_dis-nn |
"Single Ring Theorem" and the Disk-Annulus Phase Transition: Recently, an analytic method was developed to study in the large $N$ limit
non-hermitean random matrices that are drawn from a large class of circularly
symmetric non-Gaussian probability distributions, thus extending the existing
Gaussian non-hermitean liter... | cond-mat_dis-nn |
Exact non-Hermitian mobility edges and robust flat bands in
two-dimensional Lieb lattices with imaginary quasiperiodic potentials: The mobility edge (ME) is a critical energy delineates the boundary between
extended and localized states within the energy spectrum, and it plays a
crucial role in understanding the meta... | cond-mat_dis-nn |
Adaptive cluster expansion for the inverse Ising problem: convergence,
algorithm and tests: We present a procedure to solve the inverse Ising problem, that is to find
the interactions between a set of binary variables from the measure of their
equilibrium correlations. The method consists in constructing and selectin... | cond-mat_dis-nn |
Topology invariance in Percolation Thresholds: An universal invariant for site and bond percolation thresholds (p_{cs} and
p_{cb} respectively) is proposed. The invariant writes
{p_{cs}}^{1/a_s}{p_{cb}}^{-1/a_b}=\delta/d where a_s, a_b and \delta are
positive constants,and d the space dimension. It is independent of th... | cond-mat_dis-nn |
Exact Ground State Properties of Disordered Ising-Systems: Exact ground states are calculated with an integer optimization algorithm for
two and three dimensional site-diluted Ising antiferromagnets in a field (DAFF)
and random field Ising ferromagnets (RFIM). We investigate the structure and
the size-distribution of t... | cond-mat_dis-nn |
Towards quantization Conway Game of Life: Classical stochastic Conway Game of Life is expressed by the dissipative
Schr\"odinger equation and dissipative tight-binding model. This is conducted
at the prize of usage of time dependent anomalous non-Hermitian Hamiltonians as
with occurrence of complex value potential that... | cond-mat_dis-nn |
Effect of Strong Disorder on 3-Dimensional Chiral Topological
Insulators: Phase Diagrams, Maps of the Bulk Invariant and Existence of
Topological Extended Bulk States: The effect of strong disorder on chiral-symmetric 3-dimensional lattice
models is investigated via analytical and numerical methods. The phase diagr... | cond-mat_dis-nn |
Interdependent networks with correlated degrees of mutually dependent
nodes: We study a problem of failure of two interdependent networks in the case of
correlated degrees of mutually dependent nodes. We assume that both networks (A
and B) have the same number of nodes $N$ connected by the bidirectional
dependency li... | cond-mat_dis-nn |
Memory effects in transport through a hopping insulator: Understanding
two-dip experiments: We discuss memory effects in the conductance of hopping insulators due to
slow rearrangements of many-electron clusters leading to formation of polarons
close to the electron hopping sites. An abrupt change in the gate voltage... | cond-mat_dis-nn |
Long-range correlations of density in a Bose-Einstein condensate
expanding in a random potential: We study correlations of atomic density in a weakly interacting Bose-Einstein
condensate, expanding diffusively in a random potential. We show that these
correlations are long-range and that they are strongly enhanced at... | cond-mat_dis-nn |
Many-body localization, thermalization, and entanglement: Thermalizing quantum systems are conventionally described by statistical
mechanics at equilibrium. However, not all systems fall into this category,
with many body localization providing a generic mechanism for thermalization to
fail in strongly disordered syste... | cond-mat_dis-nn |
Anderson localization of a Bose-Einstein condensate in a 3D random
potential: We study the effect of Anderson localization on the expansion of a
Bose-Einstein condensate, released from a harmonic trap, in a 3D random
potential. We use scaling arguments and the self-consistent theory of
localization to show that the l... | cond-mat_dis-nn |
Dimensional Dependence of Critical Exponent of the Anderson Transition
in the Orthogonal Universality Class: We report improved numerical estimates of the critical exponent of the
Anderson transition in Anderson's model of localization in $d=4$ and $d=5$
dimensions. We also report a new Borel-Pad\'e analysis of exist... | cond-mat_dis-nn |
Phase Transition in the Random Anisotropy Model: The influence of a local anisotropy of random orientation on a ferromagnetic
phase transition is studied for two cases of anisotropy axis distribution. To
this end a model of a random anisotropy magnet is analyzed by means of the
field theoretical renormalization group a... | cond-mat_dis-nn |
Universality and universal finite-size scaling functions in
four-dimensional Ising spin glasses: We study the four-dimensional Ising spin glass with Gaussian and bond-diluted
bimodal distributed interactions via large-scale Monte Carlo simulations and
show via an extensive finite-size scaling analysis that four-dimen... | cond-mat_dis-nn |
From power law to Anderson localization in nonlinear Schrödinger
equation with nonlinear randomness: We study the propagation of coherent waves in a nonlinearly-induced random
potential, and find regimes of self-organized criticality and other regimes
where the nonlinear equivalent of Anderson localization prevails. ... | cond-mat_dis-nn |
The Leontovich boundary conditions and calculation of effective
impedance of inhomogeneous metal: We bring forward rather simple algorithm allowing us to calculate the
effective impedance of inhomogeneous metals in the frequency region where the
local Leontovich (the impedance) boundary conditions are justified. The
... | cond-mat_dis-nn |
Comment on "Erratum: Collective modes and gapped momentum states in
liquid Ga:Experiment, theory, and simulation": We show, that the theoretical expression for the dispersion of collective
excitations reported in [Phys. Rev. B {\bf 103}, 099901 (2021)], at variance
with what was claimed in the paper, does not account... | cond-mat_dis-nn |
Quantum transport of atomic matterwaves in anisotropic 2D and 3D
disorder: The macroscopic transport properties in a disordered potential, namely
diffusion and weak/strong localization, closely depend on the microscopic and
statistical properties of the disorder itself. This dependence is rich of
counter-intuitive co... | cond-mat_dis-nn |
Elementary plastic events in amorphous silica: Plastic instabilities in amorphous materials are often studied using
idealized models of binary mixtures that do not capture accurately molecular
interactions and bonding present in real glasses. Here we study atomic scale
plastic instabilities in a three dimensional molec... | cond-mat_dis-nn |
Correlated Domains in Spin Glasses: We study the 3D Edwards-Anderson spin glasses, by analyzing spin-spin
correlation functions in thermalized spin configurations at low T on large
lattices. We consider individual disorder samples and analyze connected
clusters of very correlated sites: we analyze how the volume and th... | cond-mat_dis-nn |
Probing many-body localization in a disordered quantum magnet: Quantum states cohere and interfere. Quantum systems composed of many atoms
arranged imperfectly rarely display these properties. Here we demonstrate an
exception in a disordered quantum magnet that divides itself into nearly
isolated subsystems. We probe t... | cond-mat_dis-nn |
Novel scaling behavior of the Ising model on curved surfaces: We demonstrate the nontrivial scaling behavior of Ising models defined on (i)
a donut-shaped surface and (ii) a curved surface with a constant negative
curvature. By performing Monte Carlo simulations, we find that the former model
has two distinct critical ... | cond-mat_dis-nn |
Reply to Comment on "Quantum Phase Transition of Randomly-Diluted
Heisenberg Antiferromagnet on a Square Lattice": This is a reply to the comment by A. W. Sandvik (cond-mat/0010433) on our
paper Phys. Rev. Lett. 84, 4204 (2000). We show that his data do not conflict
with our data nor with our conclusions. | cond-mat_dis-nn |
Realization-dependent model of hopping transport in disordered media: At low injection or low temperatures, electron transport in disordered
semiconductors is dominated by phonon-assisted hopping between localized
states. A very popular approach to this hopping transport is the
Miller-Abrahams model that requires a set... | cond-mat_dis-nn |
A theory of π/2 superconducting Josephson junctions: We consider theoretically a Josephson junction with a superconducting
critical current density which has a random sign along the junction's surface.
We show that the ground state of the junction corresponds to the phase
difference equal to \pi/2. Such a situation can... | cond-mat_dis-nn |
Extended states in disordered systems: role of off-diagonal correlations: We study one-dimensional systems with random diagonal disorder but
off-diagonal short-range correlations imposed by structural constraints. We
find that these correlations generate effective conduction channels for finite
systems. At a certain go... | cond-mat_dis-nn |
Real space Renormalization Group analysis of a non-mean field spin-glass: A real space Renormalization Group approach is presented for a non-mean field
spin-glass. This approach has been conceived in the effort to develop an
alternative method to the Renormalization Group approaches based on the replica
method. Indeed,... | cond-mat_dis-nn |
Signature of ballistic effects in disordered conductors: Statistical properties of energy levels, wave functions and
quantum-mechanical matrix elements in disordered conductors are usually
calculated assuming diffusive electron dynamics. Mirlin has pointed out [Phys.
Rep. 326, 259 (2000)] that ballistic effects may, un... | cond-mat_dis-nn |
Democratic particle motion for meta-basin transitions in simple
glass-formers: We use molecular dynamics computer simulations to investigate the local
motion of the particles in a supercooled simple liquid. Using the concept of
the distance matrix we find that the alpha-relaxation corresponds to a small
number of cro... | cond-mat_dis-nn |
Resistance distance distribution in large sparse random graphs: We consider an Erdos-Renyi random graph consisting of N vertices connected by
randomly and independently drawing an edge between every pair of them with
probability c/N so that at N->infinity one obtains a graph of finite mean
degree c. In this regime, we ... | cond-mat_dis-nn |
Sensitivity, Itinerancy and Chaos in Partly-Synchronized Weighted
Networks: We present exact results, as well as some illustrative Monte Carlo
simulations, concerning a stochastic network with weighted connections in which
the fraction of nodes that are dynamically synchronized is a parameter. This
allows one to desc... | cond-mat_dis-nn |
Modelling Quasicrystal Growth: Understanding the growth of quasicrystals poses a challenging problem, not
the least because the quasiperiodic order present in idealized mathematical
models of quasicrystals prohibit simple local growth algorithms. This can only
be circumvented by allowing for some degree of disorder, wh... | cond-mat_dis-nn |
Electric field induced memory and aging effects in pure solid N_2: We report combined high sensitivity dielectric constant and heat capacity
measurements of pure solid N_2 in the presence of a small external ac electric
field in the audio frequency range. We have observed strong field induced aging
and memory effects w... | cond-mat_dis-nn |
Criterion for the occurrence of many body localization in the presence
of a single particle mobility edge: Non-interacting fermions in one dimension can undergo a
localization-delocalization transition in the presence of a quasi-periodic
potential as a function of that potential. In the presence of interactions,
this... | cond-mat_dis-nn |
Numerical evidences of a universal critical behavior of 2D and 3D random
quantum clock and Potts models: The random quantum $q$-state clock and Potts models are studied in 2 and 3
dimensions. The existence of Griffiths phases is tested in the 2D case with
$q=6$ by sampling the integrated probability distribution of l... | cond-mat_dis-nn |
Absence of disordered Thouless pumps at finite frequency: A Thouless pump is a slowly driven one-dimensional band insulator which pumps
charge at a quantised rate. Previous work showed that pumping persists in
weakly disordered chains, and separately in clean chains at finite drive
frequency. We study the interplay of ... | cond-mat_dis-nn |
Frequency propagation: Multi-mechanism learning in nonlinear physical
networks: We introduce frequency propagation, a learning algorithm for nonlinear
physical networks. In a resistive electrical circuit with variable resistors,
an activation current is applied at a set of input nodes at one frequency, and
an error c... | cond-mat_dis-nn |
Solvable model of a polymer in random media with long ranged disorder
correlations: We present an exactly solvable model of a Gaussian (flexible) polymer chain
in a quenched random medium. This is the case when the random medium obeys very
long range quadratic correlations. The model is solved in $d$ spatial
dimensio... | cond-mat_dis-nn |
Floquet Time Crystals: We define what it means for time translation symmetry to be spontaneously
broken in a quantum system, and show with analytical arguments and numerical
simulations that this occurs in a large class of many-body-localized driven
systems with discrete time-translation symmetry. | cond-mat_dis-nn |
Zero-temperature Glauber dynamics on small-world networks: The zero-temperature Glauber dynamics of the ferromagnetic Ising model on
small-world networks, rewired from a two-dimensional square lattice, has been
studied by numerical simulations. For increasing disorder in finite networks,
the nonequilibrium dynamics bec... | cond-mat_dis-nn |
Scaling the alpha-relaxation time of supercooled fragile organic liquids: It was shown recently that the structural alpha-relaxation time tau of
supercooled o-terphenyl depends on a single control parameter Gamma, which is
the product of a function of density E(ro), by the inverse temperature T -1. We
extend this findi... | cond-mat_dis-nn |
Rare region effects and dynamics near the many-body localization
transition: The low-frequency response of systems near the many-body localization phase
transition, on either side of the transition, is dominated by contributions
from rare regions that are locally "in the other phase", i.e., rare localized
regions in ... | cond-mat_dis-nn |
Human Genome data analyzed by an evolutionary method suggests a decrease
in cerebral protein-synthesis rate as cause of schizophrenia and an increase
as antipsychotic mechanism: The Human Genome Project (HGP) provides researchers with the data of nearly
all human genes and the challenge to use this information for ... | cond-mat_dis-nn |
Critical-to-Insulator Transitions and Fractality Edges in Perturbed
Flatbands: We study the effect of quasiperiodic perturbations on one-dimensional
all-bands-flat lattice models. Such networks can be diagonalized by a finite
sequence of local unitary transformations parameterized by angles $\theta_i$.
Without loss o... | cond-mat_dis-nn |
Dynamic entropies, long-range correlations, and fluctuations in complex
linear structures: We investigate symbolic sequences and in particular information carriers as
e.g. books and DNA-strings. First the higher order Shannon entropies are
calculated, a characteristic root law is detected. Then the algorithmic entrop... | cond-mat_dis-nn |
Flat bands in fractal-like geometry: We report the presence of multiple flat bands in a class of two-dimensional
(2D) lattices formed by Sierpinski gasket (SPG) fractal geometries as the basic
unit cells. Solving the tight-binding Hamiltonian for such lattices with
different generations of a SPG network, we find multip... | cond-mat_dis-nn |
Localization in Correlated Bi-Layer Structures: From Photonic Cristals
to Metamaterials and Electron Superlattices: In a unified approach, we study the transport properties of
periodic-on-average bi-layered photonic crystals, metamaterials and electron
superlattices. Our consideration is based on the analytical expre... | cond-mat_dis-nn |
Random Defect Lines in Conformal Minimal Models: We analyze the effect of adding quenched disorder along a defect line in the
2D conformal minimal models using replicas. The disorder is realized by a
random applied magnetic field in the Ising model, by fluctuations in the
ferromagnetic bond coupling in the Tricritical ... | cond-mat_dis-nn |
Simulating Spin Waves in Entropy Stabilized Oxides: The entropy stabilized oxide
Mg$_{0.2}$Co$_{0.2}$Ni$_{0.2}$Cu$_{0.2}$Zn$_{0.2}$O exhibits antiferromagnetic
order and magnetic excitations, as revealed by recent neutron scattering
experiments. This observation raises the question of the nature of spin wave
excitation... | cond-mat_dis-nn |
Chain breaking and Kosterlitz-Thouless scaling at the many-body
localization transition in the random field Heisenberg spin chain: Despite tremendous theoretical efforts to understand subtleties of the
many-body localization (MBL) transition, many questions remain open, in
particular concerning its critical propertie... | cond-mat_dis-nn |
Many-body localization transition in a frustrated XY chain: We demonstrate many-body localization (MBL) transition in a one-dimensional
isotropic XY chain with a weak next-nearest-neighbor frustration in a random
magnetic field. We perform finite-size exact diagonalization calculations of
level-spacing statistics and f... | cond-mat_dis-nn |
Potts spin glasses with 3, 4 and 5 states near $T=T_c$: expanding around
the replica symmetric solution: Expansion for the free energy functionals of the Potts spin glass models with
3, 4 and 5 states up to the fourth order in $\delta q_{\alpha \beta }$ around
the replica symmetric solution (RS) is investigated using... | cond-mat_dis-nn |
Clustering of solutions in the symmetric binary perceptron: The geometrical features of the (non-convex) loss landscape of neural network
models are crucial in ensuring successful optimization and, most importantly,
the capability to generalize well. While minimizers' flatness consistently
correlates with good generali... | cond-mat_dis-nn |
Mechanical Failure in Amorphous Solids: Scale Free Spinodal Criticality: The mechanical failure of amorphous media is a ubiquitous phenomenon from
material engineering to geology. It has been noticed for a long time that the
phenomenon is "scale-free", indicating some type of criticality. In spite of
attempts to invoke... | cond-mat_dis-nn |
Short-time critical dynamics of the three-dimensional systems with
long-range correlated disorder: Monte Carlo simulations of the short-time dynamic behavior are reported for
three-dimensional Ising and XY models with long-range correlated disorder at
criticality, in the case corresponding to linear defects. The stat... | cond-mat_dis-nn |
Odor recognition and segmentation by a model olfactory bulb and cortex: We present a model of an olfactory system that performs odor segmentation.
Based on the anatomy and physiology of natural olfactory systems, it consists
of a pair of coupled modules, bulb and cortex. The bulb encodes the odor inputs
as oscillating ... | cond-mat_dis-nn |
Neutron Scattering Study of Fluctuating and Static Spin Correlations in
the Anisotropic Spin Glass Fe$_2$TiO$_5$: The anisotropic spin glass transition, in which spin freezing is observed
only along the c-axis in pseudobrookite Fe$_2$TiO$_5$, has long been perplexing
because the Fe$^{3+}$ moments (d$^5$) are expected... | cond-mat_dis-nn |
Transverse confinement of ultrasound through the Anderson transition in
3D mesoglasses: We report an in-depth investigation of the Anderson localization transition
for classical waves in three dimensions (3D). Experimentally, we observe clear
signatures of Anderson localization by measuring the transverse confinement... | cond-mat_dis-nn |
Delays, connection topology, and synchronization of coupled chaotic maps: We consider networks of coupled maps where the connections between units
involve time delays. We show that, similar to the undelayed case, the
synchronization of the network depends on the connection topology,
characterized by the spectrum of the... | cond-mat_dis-nn |
Effect of weak disorder in the Fully Frustrated XY model: The critical behaviour of the Fully Frustrated XY model in presence of weak
positional disorder is studied in a square lattice by Monte Carlo methods. The
critical exponent associated to the divergence of the chiral correlation length
is found to be equal to 1.7... | cond-mat_dis-nn |
Zero-Temperature Dynamics of Plus/Minus J Spin Glasses and Related
Models: We study zero-temperature, stochastic Ising models sigma(t) on a
d-dimensional cubic lattice with (disordered) nearest-neighbor couplings
independently chosen from a distribution mu on R and an initial spin
configuration chosen uniformly at ra... | cond-mat_dis-nn |
Extensive eigenvalues in spin-spin correlations: a tool for counting
pure states in Ising spin glasses: We study the nature of the broken ergodicity in the low temperature phase of
Ising spin glass systems, using as a diagnostic tool the spectrum of
eigenvalues of the spin-spin correlation function. We show that mult... | cond-mat_dis-nn |
Entanglement and localization in long-range quadratic Lindbladians: Existence of Anderson localization is considered a manifestation of coherence
of classical and quantum waves in disordered systems. Signatures of
localization have been observed in condensed matter and cold atomic systems
where the coupling to the envi... | cond-mat_dis-nn |
Spontaneous ordering against an external field in nonequilibrium systems: We study the collective behavior of nonequilibrium systems subject to an
external field with a dynamics characterized by the existence of
non-interacting states. Aiming at exploring the generality of the results, we
consider two types of models a... | cond-mat_dis-nn |
Unsupervised learning of phase transitions via modified anomaly
detection with autoencoders: In this paper, a modified method of anomaly detection using convolutional
autoencoders is employed to predict phase transitions in several statistical
mechanical models on a square lattice. We show that, when the autoencoder ... | cond-mat_dis-nn |
Effect of connecting wires on the decoherence due to electron-electron
interaction in a metallic ring: We consider the weak localization in a ring connected to reservoirs through
leads of finite length and submitted to a magnetic field. The effect of
decoherence due to electron-electron interaction on the harmonics o... | cond-mat_dis-nn |
Spin Domains Generate Hierarchical Ground State Structure in J=+/-1 Spin
Glasses: Unbiased samples of ground states were generated for the short-range Ising
spin glass with Jij=+/-1, in three dimensions. Clustering the ground states
revealed their hierarchical structure, which is explained by correlated spin
domains,... | cond-mat_dis-nn |
Filling a silo with a mixture of grains: Friction-induced segregation: We study the filling process of a two-dimensional silo with inelastic
particles by simulation of a granular media lattice gas (GMLG) model. We
calculate the surface shape and flow profiles for a monodisperse system and we
introduce a novel generaliz... | cond-mat_dis-nn |
Zero-modes in the random hopping model: If the number of lattice sites is odd, a quantum particle hopping on a
bipartite lattice with random hopping between the two sublattices only is
guaranteed to have an eigenstate at zero energy. We show that the localization
length of this eigenstate depends strongly on the bounda... | cond-mat_dis-nn |
Thermodynamic picture of the glassy state gained from exactly solvable
models: A picture for thermodynamics of the glassy state was introduced recently by
us (Phys. Rev. Lett. {\bf 79} (1997) 1317; {\bf 80} (1998) 5580). It starts by
assuming that one extra parameter, the effective temperature, is needed to
describe ... | cond-mat_dis-nn |
Information Bounds on phase transitions in disordered systems: Information theory, rooted in computer science, and many-body physics, have
traditionally been studied as (almost) independent fields. Only recently has
this paradigm started to shift, with many-body physics being studied and
characterized using tools devel... | cond-mat_dis-nn |
Impact of boundaries on fully connected random geometric networks: Many complex networks exhibit a percolation transition involving a
macroscopic connected component, with universal features largely independent of
the microscopic model and the macroscopic domain geometry. In contrast, we show
that the transition to ful... | cond-mat_dis-nn |
Metallic spin-glasses beyond mean-field: An approach to the
impurity-concentration dependence of the freezing temperature: A relation between the freezing temperature ($T^{}_{\rm g}$) and the exchange
couplings ($J^{}_{ij}$) in metallic spin-glasses is derived, taking the
spin-correlations ($G^{}_{ij}$) into account.... | cond-mat_dis-nn |
Finite Temperature Ordering in the Three-Dimensional Gauge Glass: We present results of Monte Carlo simulations of the gauge glass model in
three dimensions using exchange Monte Carlo. We show for the first time clear
evidence of the vortex glass ordered phase at finite temperature. Using finite
size scaling we obtain ... | cond-mat_dis-nn |
Saddles and dynamics in a solvable mean-field model: We use the saddle-approach, recently introduced in the numerical
investigation of simple model liquids, in the analysis of a mean-field solvable
system. The investigated system is the k-trigonometric model, a k-body
interaction mean field system, that generalizes the... | cond-mat_dis-nn |
Random Ising chain in transverse and longitudinal fields: Strong
disorder RG study: Motivated by the compound ${\rm LiHo}_x{\rm Y}_{1-x}{\rm F}_4$, we consider
the Ising chain with random couplings and in the presence of simultaneous
random transverse and longitudinal fields, and study its low-energy properties
at ze... | cond-mat_dis-nn |
Computing the number of metastable states in infinite-range models: In these notes I will review the results that have been obtained in these
last years on the computation of the number of metastable states in
infinite-range models of disordered systems. This is a particular case of the
problem of computing the exponen... | cond-mat_dis-nn |
Dependence of critical parameters of 2D Ising model on lattice size: For the 2D Ising model, we analyzed dependences of thermodynamic
characteristics on number of spins by means of computer simulations. We
compared experimental data obtained using the Fisher-Kasteleyn algorithm on a
square lattice with $N=l{\times}l$ s... | cond-mat_dis-nn |
Experimental Observation of Phase Transitions in Spatial Photonic Ising
Machine: Statistical spin dynamics plays a key role to understand the working
principle for novel optical Ising machines. Here we propose the gauge
transformations for spatial photonic Ising machine, where a single spatial
phase modulator simulta... | cond-mat_dis-nn |
Ward type identities for the 2d Anderson model at weak disorder: Using the particular momentum conservation laws in dimension d=2, we can
rewrite the Anderson model in terms of low momentum long range fields, at the
price of introducing electron loops. The corresponding loops satisfy a Ward
type identity, hence are muc... | cond-mat_dis-nn |
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