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Crossover to Fermi-liquid behavior for weakly-coupled Luttinger liquids
in the anisotropic large-dimension limit: We study the problem of the crossover from one- to higher-dimensional metals
by considering an array of Luttinger liquids (one-dimensional chains) coupled
by a weak interchain hopping {\tp.} We evaluate t... | cond-mat_str-el |
Incommensurate magnetic order in Ag$_{2}$NiO$_{2}$: The nature of the magnetic transition of the half-filled triangular
antiferromagnet Ag$_{2}$NiO$_2$ with $T_{\rm N}$=56K was studied with positive
muon-spin-rotation and relaxation ($\mu^+$SR) spectroscopy. Zero field
$\mu^+$SR measurements indicate the existence of a... | cond-mat_str-el |
Ferromagnetic diagonal stripe states in the two-dimensional Hubbard
model with $U\lesssim\infty$: We have performed a variational Monte Carlo simulation to study the ground
state of a two-dimensional Hubbard model on a square lattice in the strong
coupling region. The energy gain of possible inhomogeneous electron st... | cond-mat_str-el |
The Parent of Misfit-Layered Cobalt Oxides: [Sr2O2]qCoO2: Misfit-layered (ML) cobalt oxides of the general formula of [MmA2Om+2]qCoO2
have been proven to be efficient thermoelectric materials as the structure is
capable in accommodating the two seemingly contradictory characteristics of
high electrical conductivity and... | cond-mat_str-el |
Model Calculation of Electron-Phonon Couplings in a Dimer with a
Non-Degenerate Orbital: We evaluate all the electron-phonon couplings derived from the one-body
electronic interactions, in both the adiabatic and extreme non-adiabatic limit,
for a dimer with a non-degenerate orbital built from atomic wave functions of... | cond-mat_str-el |
Domain switching and exchange bias control by electric field in
multiferroic conical magnet Mn$_2$GeO$_4$: The electric field effect on magnetism was examined in the multiferroic
conical magnet Mn$_2$GeO$_4$, which shows a strong coupling between
ferromagnetic and ferroelectric order parameters. The systematic evalua... | cond-mat_str-el |
Valence Bond Phases in $S=1/2$ Kane-Mele-Heisenberg Model: The phase diagram of Kane-Mele-Heisenberg (KMH) model in classical
limit~\cite{zare}, contains disordered regions in the coupling space, as the
result of to competition among different terms in the Hamiltonian, leading to
frustration in finding a unique ground ... | cond-mat_str-el |
Correlation-driven insulator-metal transition in near-ideal vanadium
dioxide films: We use polarization- and temperature-dependent x-ray absorption spectroscopy,
in combination with photoelectron microscopy, x-ray diffraction and electronic
transport measurements, to study the driving force behind the insulator-metal... | cond-mat_str-el |
Single-molecule-mediated heat current between an electronic and a
bosonic bath: In molecular devices electronic degrees of freedom are coupled to vibrational
modes of the molecule, offering an opportunity to study fundamental aspects of
this coupling between at the nanoscale. To this end we consider the
nonequilibriu... | cond-mat_str-el |
Strong correlation effects in theoretical STM studies of magnetic
adatoms: We present a theoretical study for the scanning tunneling microscopy (STM)
spectra of surface-supported magnetic nanostructures, incorporating strong
correlation effects. As concrete examples, we study Co and Mn adatoms on the
Cu(111) surface,... | cond-mat_str-el |
Strong electron correlations in the normal state of FeSe0.42Te0.58: We investigate the normal state of the '11' iron-based superconductor
FeSe0.42Te0.58 by angle resolved photoemission. Our data reveal a highly
renormalized quasiparticle dispersion characteristic of a strongly correlated
metal. We find sheet dependent ... | cond-mat_str-el |
Local Pairing at U-impurities in BCS Superconductors: We analyse here the role electrons on Anderson-U impurities play in
superconductivity in a metal alloy. We find that phonon coupling at impurities
counteracts the traditional effects which dominate T_c suppression in the
non-magnetic limit. In some cases, we findt h... | cond-mat_str-el |
Nonmagnetic-magnetic transition and magnetically ordered structure in
SmS: SmS, a prototypical intermediate valence compound, has been studied by
performing high-pressure nuclear magnetic resonance measurements on a
$^{33}$S-enriched sample. The observation of an additional signal below 15-20 K
above a nonmagnetic-ma... | cond-mat_str-el |
Selection of factorizable ground state in a frustrated spin tube: Order
by disorder and hidden ferromagnetism: The interplay between frustration and quantum fluctuation in magnetic systems
is known to be the origin of many exotic states in condensed matter physics. In
this paper, we consider a frustrated four-leg spi... | cond-mat_str-el |
Wave Function and Strange Correlator of Short Range Entangled states: We demonstrate the following conclusion: If $|\Psi\rangle$ is a $1d$ or $2d$
nontrivial short range entangled state, and $|\Omega \rangle$ is a trivial
disordered state defined on the same Hilbert space, then the following quantity
(so called strange... | cond-mat_str-el |
Direct determination of the spin structure of Nd$_2$Ir$_2$O$_7$ by means
of neutron diffraction: We report on the spin structure of the pyrochlore iridate Nd$_2$Ir$_2$O$_7$
that could be directly determined by means of powder neutron diffraction. Our
magnetic structure refinement unravels a so-called all-in/all-out m... | cond-mat_str-el |
Interesting magnetic properties of Fe$_{1-x}$Co$_x$Si alloys: Solid solution between nonmagnetic narrow gap semiconductor FeSi and
diamagnetic semi-metal CoSi gives rise to interesting metallic alloys with
long-range helical magnetic ordering, for a wide range of intermediate
concentration. We report various interestin... | cond-mat_str-el |
Incoherent transport in a classical spin liquid: We study the energy and spin transport of the classical spin liquid hosted by
the pyrochlore Heisenberg antiferromagnet in the large $S$ limit. Molecular
dynamics calculation suggests that both the energy and spin diffusion constants
approach finite limits as the tempera... | cond-mat_str-el |
Experimentally Realized Correlated Electron Materials: From
Superconductors to Topological Insulators: Recent discoveries, as well as open questions, in experimentally realized
correlated electron materials are reviewed. In particular, high temperature
superconductivity in the cuprates and in the recently discovered ... | cond-mat_str-el |
Spectral functions in a magnetic field as a probe of spin-charge
separation in a Luttinger liquid: We show that the single-particle spectral functions in a magnetic field can
be used to probe spin-charge separation of a Luttinger liquid. Away from the
Fermi momentum, the magnetic field splits both the spinon peak and... | cond-mat_str-el |
The electronic structure of epitaxially stabilized 5d perovskite
Ca_{1-x}Sr_xIrO_3 (x = 0, 0.5, and 1) thin films: the role of strong
spin-orbit coupling: We have investigated the electronic structure of meta-stable perovskite
Ca1-xSrxIrO3 (x = 0, 0.5, and 1) thin films using transport measurements,
optical spectro... | cond-mat_str-el |
A novel continuous time quantum Monte Carlo solver for dynamical mean
field theory in the compact Legendre representation: Dynamical mean-field theory (DMFT) is one of the most widely-used methods to
treat accurately electron correlation effects in ab-initio real material
calculations. Many modern large-scale impleme... | cond-mat_str-el |
Detecting Quantum Anomalies in Open Systems: Symmetries and quantum anomalies serve as powerful tools for constraining
complicated quantum many-body systems, offering valuable insights into
low-energy characteristics based on their ultraviolet structure. Nevertheless,
their applicability has traditionally been confined... | cond-mat_str-el |
Generating function for projected entangled-pair states: Diagrammatic summation is a common bottleneck in modern applications of
projected entangled-pair states, especially in computing low-energy excitations
of a two-dimensional quantum many-body system. To solve this problem, here we
extend the generating function ap... | cond-mat_str-el |
Non-equilibrium conductivity at quantum critical points: Quantum criticality provides an important route to revealing universal
non-equilibrium behaviour. A canonical example of a quantum critical point is
the Bose-Hubbard model, which we study under the application of an electric
field. A Boltzmann transport formalism... | cond-mat_str-el |
Charge and orbital order due to cooperative Jahn-Teller effect in
manganite chains: We derive an effective Hamiltonian that takes into account the quantum nature
of phonons and models cooperative Jahn-Teller effect in the adiabatic regime
and at strong electron-phonon coupling in one dimension. Our approach involves
... | cond-mat_str-el |
Thermally activated exchange narrowing of the Gd3+ ESR fine structure in
a single crystal of Ce1-xGdxFe4P12 (x = 0.001) skutterudite: We report electron spin resonance (ESR) measurements in the Gd3+ doped
semiconducting filled skutterudite compound Ce1-xGdxFe4P12 (x = 0.001). As the
temperature T varies from T = 150 ... | cond-mat_str-el |
Magnetic ordering tendencies in hexagonal boron nitride-bilayer graphene
moiré structures: When hexagonal boron nitride (hBN) and graphene are aligned at zero or small
twist angle, a moir\'e structure is formed due to the small lattice constant
mismatch between the two structures. In this work, we analyze magnetic or... | cond-mat_str-el |
Orbital Degree of Freedom and Phase Separation in Ferromagnetic
Manganites at Finite Temperatures: The spin and orbital phase diagram for perovskite manganites are investigated
as a function of temperature and hole concentration. The superexchange and
double exchange interactions dominate the ferromagnetic phases in ... | cond-mat_str-el |
Investigation of the commensurate magnetic structure in heavy fermion
CePt2In7 using magnetic resonant X-ray diffraction: We investigated the magnetic structure of the heavy fermion compound
CePt$_2$In$_7$ below $T_N~=5.34(2)$ K using magnetic resonant X-ray diffraction
at ambient pressure. The magnetic order is char... | cond-mat_str-el |
Enhanced anisotropic spin fluctuations below tetragonal-to-orthorhombic
transition in LaFeAs(O_{1-x}F_x) probed by ^{75}As and ^{139}La NMR: $^{75}$As and $^{139}$La NMR results of LaFeAs(O$_{1-x}$F$_x$) ($x$=0, 0.025,
and 0.04) were reported. Upon F-doping, the tetragonal-to-orthorhombic
structural phase transition ... | cond-mat_str-el |
Gutzwiller variational theory for the Hubbard model with attractive
interaction: We investigate the electronic and superconducting properties of a negative-U
Hubbard model. For this purpose we evaluate a recently introduced variational
theory based on Gutzwiller-correlated BCS wave functions. We find significant
diff... | cond-mat_str-el |
Persistent half-metallic ferromagnetism in a (111)-oriented manganite
superlattice: Heterostructures of mixed-valence manganites are still under intense
scrutiny, due to the occurrence of exotic quantum phenomena linked to
electronic correlation and interfacial composition. For instance, if two
anti-ferromagnetic ins... | cond-mat_str-el |
Band structure approach to the resonant x-ray scattering: We study the resonance behaviour of the forbidden 600 and 222 x-ray Bragg
peaks in Ge using LDA band structure methods. These Bragg peaks remain
forbidden in the resonant dipole scattering approximation even taking into
account the non local nature of the band s... | cond-mat_str-el |
Theory of magnetostriction for multipolar quantum spin ice in pyrochlore
materials: Multipolar magnetism is an emerging field of quantum materials research. The
building blocks of multipolar phenomena are magnetic ions with a non-Kramers
doublet, where the orbital and spin degrees of freedom are inextricably
intertwi... | cond-mat_str-el |
Density Matrix Spectra and Order Parameters in the 1D Extended Hubbard
Model: Without any knowledge of the symmetry existing in the system, we derive the
exact forms of the order parameters which show long-range correlation in the
ground state of the one-dimensional extended Hubbard model using a quantum
information ... | cond-mat_str-el |
Magnetic-field induced band-structure change in CeBiPt: We report on a field-induced change of the electronic band structure of
CeBiPt as evidenced by electrical-transport measurements in pulsed magnetic
fields. Above ~25 T, the charge-carrier concentration increases nearly 30% with
a concomitant disappearance of the S... | cond-mat_str-el |
Double-Pulse Deexcitations in a One-Dimensional Strongly Correlated
System: We investigate the ultrafast optical response of the one-dimensional
half-filled extended Hubbard model exposed to two successive laser pulses. By
using the time-dependent Lanczos method, we find that following the first
pulse, the excitation... | cond-mat_str-el |
Multiple Diffusion-Freezing Mechanisms in Molecular Hydrogen Films: Molecular hydrogen is a fascinating candidate for quantum fluid showing
bosonic and fermionic superfluidity. We have studied diffusion dynamics of thin
films of H$_2$, HD and D$_2$ adsorbed on a glass substrate by measurements of
elasticity. The elasti... | cond-mat_str-el |
Phase diagram of a one-dimensional Ising model with an anomalous Z_2
symmetry: Anomalous global symmetries, which can be realized on the boundary of
symmetry-protected topological phases, brings new phases and phase transitions
to condensed matter physics. In this work, we study a one dimensional model
with an anomal... | cond-mat_str-el |
Compensation of Coulomb blocking and energy transfer in the current
voltage characteristic of molecular conduction junctions: We have studied the influence of both exciton effects and Coulomb repulsion
on current in molecular nanojunctions. We show that dipolar energy-transfer
interactions between the sites in the wi... | cond-mat_str-el |
Relationship between the ground-state wave function of a magnet and its
static structure factor: We state and prove two theorems about the ground state of magnetic systems
described by very general Heisenberg-type models and discuss their implications
for magnetic neutron scattering. The first theorem states that two... | cond-mat_str-el |
Tuning the bond order wave (BOW) phase of half-filled extended Hubbard
models: Theoretical and computational studies of the quantum phase diagram of the
one-dimensional half-filled extended Hubbard model (EHM) indicate a narrow bond
order wave (BOW) phase with finite magnetic gap $E_m$ for on-site repulsion $U
< U^*$... | cond-mat_str-el |
Entanglement switching via the Kondo effect in triple quantum dots: We consider a triple quantum dot system in a triangular geometry with one of
the dots connected to metallic leads. Using Wilson's numerical renormalization
group method, we investigate quantum entanglement and its relation to the
thermodynamic and tran... | cond-mat_str-el |
Observation of re-entrant correlated insulators and interaction driven
Fermi surface reconstructions at one magnetic flux quantum per moiré unit
cell in magic-angle twisted bilayer graphene: The discovery of flat bands with non-trivial band topology in magic angle
twisted bi-layer graphene (MATBG) has provided a un... | cond-mat_str-el |
Unified Fock space representation of fractional quantum Hall states: Many bosonic (fermionic) fractional quantum Hall states, such as Laughlin,
Moore-Read and Read-Rezayi wavefunctions, belong to a special class of
orthogonal polynomials: the Jack polynomials (times a Vandermonde determinant).
This fundamental observat... | cond-mat_str-el |
Tensor renormalization group approach to classical dimer models: We analyze classical dimer models on the square and triangular lattice using
a tensor network representation of the dimers. The correlation functions are
numerically calculated using the recently developed "Tensor renormalization
group" (TRG) technique. T... | cond-mat_str-el |
The Effect of Intrinsic Quantum Fluctuations on the Phase Diagram of
Anisotropic Dipolar Magnets: The rare-earth material $\mathrm{LiHoF_4}$ is believed to be an experimental
realization of the celebrated (dipolar) Ising model, and upon the inclusion of
a transverse field $B_x$, an archetypal quantum Ising model. Mor... | cond-mat_str-el |
Cumulant-based calculations of the correlation energy in a molecule: The problem of constructing a guaranteed convergent sequence of corrections
to the Hartree--Fock ground state energy of a molecule without storing the
many-electron wave function is considered. Several methods based on cumulants
are considered and it ... | cond-mat_str-el |
Numerical Study of the Pairing Correlation of the t-J Type Models: We reported that the pair-pair correlation function of the two-dimensional
t-J model does not have long-range d-wave superconducting correlations in the
interesting parameter range of $J/t \leq 0.5$. The power-Lanczos method is used
under the assumption... | cond-mat_str-el |
Road to zero-field antiferromagnetic skyrmions in a frustrated AFM/FM
heterostructure: We demonstrate a mechanism of significant reduction, including complete
elimination, of the external magnetic field required for the stabilization of a
skyrmion lattice (SkX) phase in a frustrated triangular Heisenberg
antiferromag... | cond-mat_str-el |
Exact treatment of exciton-polaron formation by Diagrammatic Monte Carlo: We develop an approximation-free Diagrammatic Monte Carlo technique to study
fermionic particles interacting with each other simultaneously through both an
attractive Coulomb potential and bosonic excitations of the underlying medium.
Exemplarily... | cond-mat_str-el |
Magnon crystals and magnetic phases in a Kagomé-stripe antiferromagnet: In this work we analyze the magnetization properties of an antiferromagnetic
Kagom\'e stripe lattice, motivated by the recent synthesis of materials
exhibiting this structure. By employing a variety of techniques that include
numerical methods as D... | cond-mat_str-el |
Helical magnetic ordering in Sr(Co1-xNix)2As2: SrCo2As2 is a peculiar itinerant magnetic system that does not order
magnetically, but inelastic neutron scattering experiments observe the same
stripe-type antiferromagnetic (AF) fluctuations found in many of the Fe-based
superconductors along with evidence of magnetic fr... | cond-mat_str-el |
t2g-orbital model on a honeycomb lattice: application to antiferromagnet
SrRu2O6: Motivated by the recent discovery of high temperature antiferromagnet
SrRu$_2$O$_6$ and its potential to be the parent of a new superconductor, we
construct a minimal $t_{2g}$-orbital model on a honeycomb lattice to simulate
its low ene... | cond-mat_str-el |
Concentration dependence in kinetic arrest of first order magnetic
transition in Ta doped $HfFe_2$: Magnetic behavior of the pseudo-binary alloy $Hf_{1-x}Ta_xFe_2$ has been
studied, for which the zero field ferromagnetic (FM) to antiferromagnetic (AFM)
transition temperature is tuned near to T=0 K. These alloys show ... | cond-mat_str-el |
Quantum criticality and confinement in weak Mott insulators: Electrons undergoing a Mott transition may shed their charge but persist as
neutral excitations of a quantum spin liquid (QSL). We introduce concrete
two-dimensional models exhibiting this exotic behavior as they transition from
superconducting or topological... | cond-mat_str-el |
Dynamical Properties of small Polarons: On the basis of the two-site polaron problem, which we solve by exact
diagonalization, we analyse the spectral properties of polaronic systems in
view of discerning localized from itinerant polarons and bound polaron pairs
from an ensemble of single polarons. The corresponding ex... | cond-mat_str-el |
Elementary Building Blocks for Cluster Mott Insulators: Mott insulators, in which strong Coulomb interactions fully localize
electrons on single atomic sites, play host to an incredibly rich and exciting
array of strongly correlated physics. One can naturally extend this concept to
cluster Mott insulators, wherein elec... | cond-mat_str-el |
Phase diagram of the one-dimensional extended attractive Hubbard model
for large nearest-neighbor repulsion: We consider the extended Hubbard model with attractive on-site interaction U
and nearest-neighbor repulsions V. We construct an effective Hamiltonian
H_{eff} for hopping t<<V and arbitrary U<0. Retaining the m... | cond-mat_str-el |
Hidden antiferro-nematic order in Fe-based superconductor BaFe$_2$As$_2$
and NaFeAs above $T_S$: In several Fe-based superconductors, slight $C_4$ symmetry breaking occurs at
$T^*$, which is tens of Kelvin higher than the structural transition
temperature $T_S$. In this "hidden" nematic state at $T_S<T<T^*$, the
orth... | cond-mat_str-el |
Spin-valley skyrmions in graphene at filling factor $ν=-1$: We model quantum Hall skyrmions in graphene monolayer at quarter filling by a
theory of CP3 fields and study the energy minimizing skyrmions in presence of
valley pseudospin anisotropy and Zeeman coupling. We present a diagram of all
types of skyrmions in a wi... | cond-mat_str-el |
Probing the stability of the spin liquid phases in the Kitaev-Heisenberg
model using tensor network algorithms: We study the extent of the spin liquid phases in the Kitaev-Heisenberg model
using infinite Projected Entangled-Pair States tensor network ansatz wave
functions directly in the thermodynamic limit. To asses... | cond-mat_str-el |
Existence of Fine Structure inside Spin Gap in CeRu2Al10: We investigate the magnetic field effect on the spin gap state in CeRu2Al10
by measuring the magnetization and electrical resistivity. We found that the
magnetization curve for the magnetic field H//c shows a metamagnetic-like
anomaly at H*~4 T below T_0=27 K, b... | cond-mat_str-el |
Magnetic frustrations in the face centered cubic antiferromagnet NiS2: Neutron scattering experiment on NiS2 single crystal revealed a honeycomb
pattern of the intensity distribution in reciprocal lattice space
(continuous-line structure along the fcc zone boundary) providing the first
direct evidence for nearly frustr... | cond-mat_str-el |
High-pressure crystal growth and investigation of the metal-to-metal
transition of Ruddlesden-Popper trilayer nickelates La$_4$Ni$_3$O$_{10}$: Single crystals of Ruddlesden-Popper nickelates La$_4$Ni$_3$O$_{10}$ were
grown by means of the floating-zone technique at oxygen pressure of 20~bar. Our
results reveal the ef... | cond-mat_str-el |
Quantum critical phenomena in a spin-1/2 frustrated square lattice with
spatial anisotropy: We present a model compound with a spin-1/2 spatially anisotropic frustrated
square lattice, in which three antiferromagnetic interactions and one
ferromagnetic interaction are competing. We observe an unconventional gradual
i... | cond-mat_str-el |
Topological Majorana Two-Channel Kondo Effect: A one-dimensional time-reversal-invariant topological superconductor hosts a
Majorana Kramers pair at each end, where time-reversal symmetry acts as a
supersymmetry that flips local fermion parity. We examine the transport anomaly
of such a superconductor, floating and tun... | cond-mat_str-el |
Constructing Landau framework for topological order: Quantum chains and
ladders: We studied quantum phase transitions in the antiferromagnetic dimerized
spin-1/2 XY chain andvtwo-leg ladders. From analysis of several spin models we
present our main result: the framework to deal with topological orders and
hidden symm... | cond-mat_str-el |
Investigating the electronic structure of MSi (M = Cr, Mn, Fe $\&$ Co)
and calculating $\textit{$U_{eff}$}$ $\&$ $\textit{J}$ by using cDFT: We have investigated electronic energy band structures and partial density of
states of intermetallic compounds $\textit{viz.}$ CrSi, MnSi, FeSi and CoSi, by
using density funct... | cond-mat_str-el |
Quadrupolar Superexchange Interactions, Multipolar Order and Magnetic
Phase Transition in UO$_2$: The origin of non-collinear magnetic order in UO$_{2}$ is studied by an ab
initio dynamical-mean-field-theory framework in conjunction with a
linear-response approach for evaluating inter-site superexchange interactions
... | cond-mat_str-el |
Electronic structure of CrN: A comparison between different exchange
correlation potentials: We report a series of electronic structure calculations for CrN using
different exchange correlation potentials: PBE, LDA+$U$, the Tran-Blaha
modified Becke-Johnson, and hybrid functionals. In every case, our calculations
sho... | cond-mat_str-el |
Bridging the Gap between Deep Learning and Frustrated Quantum Spin
System for Extreme-scale Simulations on New Generation of Sunway
Supercomputer: Efficient numerical methods are promising tools for delivering unique
insights into the fascinating properties of physics, such as the highly
frustrated quantum many-bod... | cond-mat_str-el |
Kagome Materials I: SG 191, ScV$_6$Sn$_6$. Flat Phonon Soft Modes and
Unconventional CDW Formation: Microscopic and Effective Theory: Kagome Materials with flat bands exhibit wildly different physical properties
depending on symmetry group, and electron number. For the case of ScV$_6$Sn$_6$
in space group 191, we inv... | cond-mat_str-el |
Variational Monte Carlo Method in the Presence of Spin-Orbit Interaction
and Its Application to the Kitaev and Kitaev-Heisenberg Model: We propose an accurate variational Monte Carlo method applicable in the
presence of the strong spin-orbit interaction. Our variational wave functions
consist of generalized Pfaffian-... | cond-mat_str-el |
Nonlinear sigma Model Treatment of Quantum Antiferromagnets in a
Magnetic Field: We present a theoretical analysis of the properties of low-dimensional
quantum antiferromagnets in applied magnetic fields. In a nonlinear sigma model
description, we use a spin stiffness analysis, a 1/N expansion, and a
renormalization ... | cond-mat_str-el |
Effect of strong correlations on the high energy anomaly in hole- and
electron-doped high-Tc superconductors: Recently, angle-resolved photoemission spectroscopy (ARPES) has been used to
highlight an anomalously large band renormalization at high binding energies in
cuprate superconductors: the high energy 'waterfall... | cond-mat_str-el |
Optimal grouping of arbitrary diagrammatic expansions via analytic pole
structure: We present a general method to optimize the evaluation of Feynman
diagrammatic expansions, which requires the automated symbolic assignment of
momentum/energy conserving variables to each diagram. With this symbolic
representation, we ... | cond-mat_str-el |
Topological classification of non-Hermitian Hamiltonians with frequency
dependence: We develop a topological classification of non-Hermitian effective
Hamiltonians that depend on momentum and frequency. Such effective Hamiltonians
are in one-to-one correspondence to single-particle Green's functions of
systems that s... | cond-mat_str-el |
Superfluid and supersolid phases of lattice bosons with ring-exchange
interaction: We examine the superfluid phase of a hard-core boson model with
nearest-neighbor exchange J and four-particle ring-exchange K at half-filling
on the square lattice. At zero temperature we find that the superfluid in the
pure-J model is... | cond-mat_str-el |
Analytic Relations between Localizable Entanglement and String
Correlations in Spin Systems: We study the relation between the recently defined localizable entanglement
and generalized correlations in quantum spin systems. Differently from the
current belief, the localizable entanglement is always given by the averag... | cond-mat_str-el |
Charge and spin correlations of a one dimensional electron gas on the
continuum: We present a variational Monte Carlo study of a model one dimensional
electron gas on the continuum, with long-range interaction (1/r decay). At low
density the reduced dimensionality brings about pseudonodes of the many-body
wavefunctio... | cond-mat_str-el |
Bond-bond correlations, gap relations and thermodynamics of spin-$1/2$
chains with spin-Peierls transitions and bond-order-wave phases: The spin-$1/2$ chain with antiferromagnetic exchange $J_1$ and $J_2 = \alpha
J_1$ between first and second neighbors, respectively, has both gapless and
gapped ($\Delta(\alpha) > 0$)... | cond-mat_str-el |
Transport across junctions of a Weyl and a multi-Weyl semimetal: We study transport across junctions of a Weyl and a multi-Weyl semimetal (WSM
and a MSM) separated by a region of thickness $d$ which has a barrier potential
$U_0$. We show that in the thin barrier limit ($U_0 \to \infty$ and $d \to 0$
with $\chi=U_0 d/(\... | cond-mat_str-el |
Suppression of electronic susceptibility in metal-Mott insulator
alternating material, (Me-3,5-DIP)[Ni(dmit)2]2: Frequency shifts and nuclear relaxations of 13C NMR of the metal-insulator
alternating material, (Me-3,5-DIP)[Ni(dmit)2]2, are presented. The NMR
absorption lines originating from metallic and insulating l... | cond-mat_str-el |
Neutron scattering and muon-spin spectroscopy studies of the magnetic
triangular-lattice compounds $A_2$La$_2$NiW$_2$O$_{12}$ ($A$ = Sr, Ba): We report on the geometrically frustrated two-dimensional triangular-lattice
magnets $A_2$La$_2$NiW$_2$O$_{12}$ ($A$ = Sr, Ba) studied mostly by means of
neutron powder diffrac... | cond-mat_str-el |
A continuous transition between fractional quantum Hall and superfluid
states: We develop a theory of a direct, continuous quantum phase transition between
a bosonic Laughlin fractional quantum Hall (FQH) state and a superfluid,
generalizing the Mott insulator to superfluid phase diagram of bosons to allow
for the br... | cond-mat_str-el |
Loop currents in quantum matter: In many quantum materials, strong electron correlations lead to the emergence
of new states of matter. In particular, the study in the last decades of the
complex phase diagram of high temperature superconducting cuprates highlighted
intra-unit-cell electronic instabilities breaking dis... | cond-mat_str-el |
Coexistence of antiferromagnetism and dimerization in a disordered
spin-Peierls model: exact results: A model of disordered spin-Peierls system is considered, where domain walls
are randomly distributed as a telegraph noise. For this realization of the
disorder in an XX spin chain, we calculate exactly the density of... | cond-mat_str-el |
The Kondo effect in the quantum $XX$ spin chain: We investigate the boundary phenomena that arise in a finite-size $XX$ spin
chain interacting through an $XX$ interaction with a spin$-\frac{1}{2}$
impurity located at its edge. Upon Jordan-Wigner transformation, the model is
described by a quadratic Fermionic Hamiltonia... | cond-mat_str-el |
One-particle spectral properties of the t-J-$V$ model on the triangular
lattice near charge order: We study the t-J-$V$ model beyond mean field level at finite doping on the
triangular lattice. The Coulomb repulsion $V$ between nearest neighbors brings
the system to a charge ordered state for $V$ larger than a critic... | cond-mat_str-el |
Low rank compression in the numerical solution of the nonequilibrium
Dyson equation: We propose a method to improve the computational and memory efficiency of
numerical solvers for the nonequilibrium Dyson equation in the Keldysh
formalism. It is based on the empirical observation that the nonequilibrium
Green's func... | cond-mat_str-el |
Real time cumulant approach for charge transfer satellites in x-ray
photoemission spectra: X-ray photoemission spectra generally exhibit satellite features in addition
to the quasi-particle peaks due to many-body excitations, which have been of
considerable theoretical and experimental interest. However, the satellit... | cond-mat_str-el |
Charge and spin stripe in La$_{2-x}$Sr$_{x}$NiO$_{4}$ (x=1/3,1/2): Electronic structure of stripe ordered La$_{2-x}$Sr$_{x}$NiO$_{4}$ is
investigated. The system with x=1/3 is insulator, in LSDA+U calculations, and
shows charge and spin stripe, consistent with the experimental results. Highly
correlated system of x=1/2... | cond-mat_str-el |
The boundaries of 2+1D fermionic topological orders: $2+1$D bosonic topological orders can be characterized by the $S,T$ matrices
that encode the statistics of topological excitations. In particular, the $S,T$
matrices can be used to systematically obtain the gapped boundaries of bosonic
topological orders. Such an app... | cond-mat_str-el |
Anomalies in a slightly doped insulator with strong particle-hole
asymmetry and narrow gap---the case for SmB$_6$?: SmB$_6$, known to be a Kondo insulator, has received intense scrutiny in
recent years due to its paradoxical experimental signatures: while some
quantities show an insulating behavior, others point to a... | cond-mat_str-el |
Short Range Interaction Effects on the Density of States of Disordered
Two Dimensional Crystals with a half--filled band: The Density of electronic States (DoS) of a two--dimensional square lattice
with substitutional impurities is calculated in the presence of short--range
electron--electron interactions. In the mid... | cond-mat_str-el |
Interconnected Renormalization of Hubbard Bands and Green's Function
Zeros in Mott Insulators Induced by Strong Magnetic Fluctuations: We analyze the role of spatial electronic correlations and, in particular, of
the magnetic fluctuations in Mott insulators. A half-filled Hubbard model is
solved at large strength of ... | cond-mat_str-el |
Electron correlation effects in superconducting nanowires in and out of
equilibrium: One-dimensional nanowires with strong spin-orbit coupling and
proximity-induced superconductivity are predicted to exhibit topological
superconductivity with condensed-matter analogues to Majorana fermions. Here,
the nonequilibrium G... | cond-mat_str-el |
New gapped quantum phases for S=1 spin chain with D2h symmetry: We study different quantum phases in integer spin systems with on-site
D2h=D2xZ2 and translation symmetry. We find four distinct non-trivial phases in
S=1 spin chains despite they all have the same symmetry. All the four phases
have gapped bulk excitations... | cond-mat_str-el |
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