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Topological Nature of Anomalous Hall Effect in Ferromagnet: The anomalous Hall effect in two-dimensional ferromagnets is discussed to be
the physical realization of the parity anomaly in (2+1)D, and the band crossing
points behave as the topological singularity in the Brillouin zone. This
appears as the sharp peaks and... | cond-mat_str-el |
CsMn$_4$As$_3$: A layered tetragonal transition-metal pnictide compound
with antiferromagnetic ground state: We report the synthesis and properties of a new layered tetragonal ternary
compound CsMn$_4$As$_3$ (structure: KCu$_4$S$_3$-type, space group: $P4/mmm$,
No. 123 and $Z = 2$). The material is a small band-gap s... | cond-mat_str-el |
The phase diagram and the structure of CDW state in high magnetic field
in quasi-1D materials: mean-field approach: We develop the mean-field theory of a charge-density wave (CDW) state in
magnetic field and study the properties of this state below the transition
temperature. We show that the CDW state with shifted w... | cond-mat_str-el |
Chern and $Z_{2}$ topological insulating phases in perovskite-derived
$4d$ and $5d$ oxide buckled honeycomb lattices: Based on density functional theory calculations including a Coulomb repulsion
parameter $U$, we explore the topological properties of
(La$X$O$_3$)$_2$/(LaAlO$_3$)$_4$(111) with $X=$ $4d$ and $5d$ cati... | cond-mat_str-el |
Constraint Effective Potential of the Magnetization in the Quantum XY
Model: Using an improved estimator in the loop-cluster algorithm, we investigate the
constraint effective potential of the magnetization in the spin $\tfrac{1}{2}$
quantum XY model. The numerical results are in excellent agreement with the
predicti... | cond-mat_str-el |
Phonon anomalies due to stripe collective modes in high T_c cuprates: Phonon anomalies observed in various high $T_c$ cuprates by neutron
experiments are analyzed theoretically in terms of the stripe concept. The
phonon self-energy correction is evaluated by taking into account the charge
collective modes of stripes, g... | cond-mat_str-el |
Hole-pair hopping in arrangements of hole-rich/hole-poor domains in a
quantum antiferromagnet: We study the motion of holes in a doped quantum antiferromagnet in the
presence of arrangements of hole-rich and hole-poor domains such as the
stripe-phase in high-$T_C$ cuprates. When these structures form, it becomes
ener... | cond-mat_str-el |
Analysis of the magnetic response of the edge-sharing chain cuprate
Li$_2$CuO$_2$ within TMRG: It is widely accepted that the low-energy physics in edge-sharing cuprate
materials has one-dimensional (1D) character. The relevant model to study such
systems is believed to be the 1D extended Heisenberg model with ferrom... | cond-mat_str-el |
Functional renormalization group for frustrated magnets with nondiagonal
spin interactions: In the field of quantum magnetism, the advent of numerous spin-orbit assisted
Mott insulating compounds, such as the family of Kitaev materials, has led to a
growing interest in studying general spin models with non-diagonal i... | cond-mat_str-el |
The stability of 3D skyrmions under mechanical stress studied via Monte
Carlo calculations: Using Monte Carlo (MC) simulations, we study the skyrmion
stability/instability as a response to uniaxial mechanical stresses. Skyrmions
emerge in chiral magnetic materials as a stable spin configuration under
external magneti... | cond-mat_str-el |
Luttinger liquid coupled to Bose-Einstein condensation reservoirs: We investigate the transport properties for a Luttinger liquid coupled to two
identical Bose-Einstein condensation reservoirs. Using the approach of equation
of motion for the Green function of the system, we find that the distance
between the two reson... | cond-mat_str-el |
Planar Thermal Hall Effects in Kitaev Spin Liquid Candidate Na2Co2TeO6: We investigate both the longitudinal thermal conductivity ($\kappa_{xx}$) and
the planar thermal Hall conductivity ($\kappa_{xy}$) in the Kitaev spin liquid
candidate of Co-based honeycomb antiferromagnet Na$_2$Co$_2$TeO$_6$ in a
magnetic field ($B... | cond-mat_str-el |
Charge, Lattice, and Spin Dynamics in Photoinduced Phase Transitions
from Charge-Order-Insulator to Metal in Quasi-Two-Dimensional Organic
Conductors: To elucidate different photoinduced melting dynamics of charge orders
observed in quasi-two-dimensional organic conductors $ \theta
$-(BEDT-TTF)$_2$RbZn(SCN)$_4$ and... | cond-mat_str-el |
Spin-glass like dynamics of ferromagnetic clusters in
La$_{0.75}$Ba$_{0.25}$CoO$_3$: We report the magnetization study of the compound
La$_{0.75}$Ba$_{0.25}$CoO$_3$ where Ba$^{2+}$ doping is just above the critical
limit for percolation of ferromagnetic clusters. The field cooled (FC) and zero
field cooled (ZFC) magn... | cond-mat_str-el |
Theory of the field-revealed Kitaev spin liquid: Elementary excitations in highly entangled states such as quantum spin
liquids may exhibit exotic statistics, different from those obeyed by
fundamental bosons and fermions. Excitations called non-Abelian anyons are
predicted to exist in a Kitaev spin liquid - the ground... | cond-mat_str-el |
Unconventional spin transport in strongly correlated kagome systems: Recent progress in material design enables the study of correlated,
low-temperature phases and associated anomalous transport in two-dimensional
kagome systems. Here, we show that unconventional spin transport can arise in
such systems even at elevate... | cond-mat_str-el |
Dynamical Conductivity of Dirac Materials: For graphene (a Dirac material) it has been theoretically predicted and
experimentally observed that DC resistivity is proportional to $ T^4$ when the
temperature is much less than Bloch- Gr\"{u}neisen ($\Theta_{BG}$) temperature
and T linear in opposite case ($T>>\Theta_{BG}$... | cond-mat_str-el |
Metal-Mott insulator interfaces: Motivated by the direct observation of electronic phase separation in
first-order Mott transitions, we model the interface between the
thermodynamically coexisting metal and Mott insulator. We show how to model the
required slab geometry and extract the electronic spectra. We construct ... | cond-mat_str-el |
Magnetic Field Induced Exotic Phases in Isotropic Frustrated Spin-1/2
chain: The frustrated isotropic $J_1-J_2$ model with ferromagnetic $J_1$ and
anti-ferromagnetic $J_2$ interactions in presence of an axial magnetic field
shows many exotic phases, such as vector chiral and multipolar phases. The
existing studies of... | cond-mat_str-el |
Pomeranchuk instability in doped graphene: The density of states of graphene has Van Hove singularities that can be
reached by chemical doping and have already been explored in photoemission
experiments. We show that in the presence of Coulomb interactions the system at
the Van Hove filling is likely to undergo a Pomer... | cond-mat_str-el |
Accessing the spectral function in a current-carrying device: The presence of an electrical transport current in a material is one of the
simplest and most important realisations of non-equilibrium physics. The
current density breaks the crystalline symmetry and can give rise to dramatic
phenomena, such as sliding char... | cond-mat_str-el |
Parametrization of LSDA+$U$ for noncollinear magnetic configurations:
Multipolar magnetism in UO$_2$: To explore the formation of noncollinear magnetic configurations in materials
with strongly correlated electrons, we derive a noncollinear LSDA+$U$ model
involving only one parameter $U$, as opposed to the difference... | cond-mat_str-el |
Characterizing The Many-Body Localization via Studying State Sensitivity
to Boundary Conditions: We introduce novel characterizations for many-body phase transitions between
delocalized and localized phases based on the system's sensitivity to boundary
conditions. In particular, we change boundary conditions from per... | cond-mat_str-el |
Ab initio downfolding for electron-phonon coupled systems: constrained
density-functional perturbation theory (cDFPT): We formulate an ab initio downfolding scheme for electron-phonon coupled
systems. In this scheme, we calculate partially renormalized phonon frequencies
and electron-phonon coupling, which include th... | cond-mat_str-el |
Gutzwiller-correlated wave functions for degenerate bands: exact results
in infinite dimensions: We introduce Gutzwiller-correlated wave functions for the variational
investigation of general multi-band Hubbard models. We set up a diagrammatic
formalism which allows us to evaluate analytically ground-state properties... | cond-mat_str-el |
Field-induced intermediate phase in $α$-RuCl$_3$: Non-coplanar
order, phase diagram, and proximate spin liquid: Frustrated magnets with strong spin-orbit coupling promise to host
topological states of matter, with fractionalized excitations and emergent
gauge fields. Kitaev's proposal for a honeycomb-lattice Majorana... | cond-mat_str-el |
Entanglement entropy of the $ν=1/2$ composite fermion non-Fermi liquid
state: The so-called ``non-Fermi liquid'' behavior is very common in strongly
correlated systems. However, its operational definition in terms of ``what it
is not'' is a major obstacle against theoretical understanding of this
fascinating correlat... | cond-mat_str-el |
Phonon spectral function of the one-dimensional Holstein-Hubbard model: We use the continuous-time interaction expansion (CT-INT) quantum Monte Carlo
method to calculate the phonon spectral function of the one-dimensional
Holstein-Hubbard model at half-filling. Our results are consistent with a
soft-mode Peierls transi... | cond-mat_str-el |
Evolution of magnetism in Pd-substituted Ce$_2$RhIn$_8$ single crystals: The evolution of magnetism and superconductivity in
Ce$_2$Rh$_{1-x}$Pd$_x$In$_8$ solid solutions has been studied within the entire
concentration range by means of thermodynamic and magnetic measurements at
ambient pressure and at temperatures bet... | cond-mat_str-el |
Interpretation of high-pressure experiments on FeAs superconductors: In two recent articles (cond-mat/0606177 and arXiv:0804.1615), we have
suggested a unified theory of superconductivity based on the real-space
spin-parallel electron pairing and superconducting mechanism and have shown
that the stable hexagonal and te... | cond-mat_str-el |
Integrable Extended Hubbard Hamiltonians from Symmetric Group Solutions: We consider the most general form of extended Hubbard Hamiltonian conserving
the total spin and number of electrons, and find all the 1-dimensional
completely integrable models which can be derived from first degree polynomial
solution of the Yang... | cond-mat_str-el |
Topological Magnons: A Review: At sufficiently low temperatures magnetic materials often enter a correlated
phase hosting collective, coherent magnetic excitations such as magnons or
triplons. Drawing on the enormous progress on topological materials of the last
few years, recent research has led to new insights into t... | cond-mat_str-el |
Pair Superfluid and Supersolid of Correlated Hard-Core Bosons on a
Triangular Lattice: We have systematically studied the hard-core Bose-Hubbard model with
correlated hopping on a triangular lattice using density-matrix renormalization
group method. A rich ground state phase diagram is determined. In this phase
diagr... | cond-mat_str-el |
Coulomb matrix elements in multi-orbital Hubbard models: Coulomb matrix elements are needed in all studies in solid-state theory that
are based on Hubbard-type multi-orbital models. Due to symmetries, the matrix
elements are not independent. We determine a set of independent Coulomb
parameters for a $d$-shell and a $f$... | cond-mat_str-el |
The electronic structure of La$_{1.48}$Nd$_{0.4}$Sr$_{0.12}$CuO$_4$
probed by high- and low-energy angle-resolved photoelectron spectroscopy:
evolution with probing depth: We present angle-resolved photoelectron spectroscopy data probing the
electronic structure of the Nd-substituted high-$T_c$ cuprate
La$_{1.48}$N... | cond-mat_str-el |
Terahertz Electrodynamics of Mixed-Valent YbAl$_3$ and LuAl$_3$ Thin
Films: We present THz measurements of thin films of mixed-valent YbAl$_3$ and its
structural analogue LuAl$_3$. Combined with traditional Fourier transform
infrared (FTIR) spectroscopy, the extended Drude formalism is utilized to study
the low-frequ... | cond-mat_str-el |
Magnetic bubble crystal in tetragonal magnets: A magnetic bubble crystal is a two-dimensional soliton lattice consisting of
multiple spin density waves similar to a magnetic skyrmion crystal.
Nevertheless, the emergence of the bubble crystal with a collinear spin texture
is rare compared to that of the skyrmion crystal... | cond-mat_str-el |
The Square-Lattice Heisenberg Antiferromagnet at Very Large Correlation
Lengths: The correlation length of the square-lattice spin-1/2 Heisenberg
antiferromagnet is studied in the low-temperature (asymptotic-scaling) regime.
Our novel approach combines a very efficient loop cluster algorithm --
operating directly in ... | cond-mat_str-el |
Singlet Ground State and Magnetization Plateaus in Ba$_3$Mn$_2$O$_8$: Magnetic susceptibility and the magnetization process have been measured in
\green polycrystal. In this compound, the magnetic manganese ion exists as
Mn$^{5+}$ in a tetrahedral environment, and thus the magnetic interaction can
be described by an S=... | cond-mat_str-el |
Two-stage spin-flop transitions in S = 1/2 antiferromagnetic spin chain
BaCu_2Si_2O_7: Two-stage spin-flop transitions are observed the in quasi-one-dimensional
antiferromagnet, BaCu${}_2$Si${}_2$O${}_7$. A magnetic field applied along the
easy axis induces a spin-flop transition at 2.0 T followed by a second
transit... | cond-mat_str-el |
Curvature induced drift and deformation of magnetic skyrmions:
comparison of ferro- and antiferromagnetic cases: The influence of the geometrical curvature of chiral magnetic films on the
static and dynamic properties of hosted skyrmions are studied theoretically. We
predict the effects of the curvature-induced drift... | cond-mat_str-el |
An Ising model on a 3D honeycomb zigzag-ladder lattice: a solution to
the ground-state problem and application to the SrRE$_2$O$_4$ and
BaRE$_2$O$_4$ magnets: An exact solution (incomplete) of the ground-state problem for an Ising model
in an external field on a 3D honeycomb zigzag-ladder lattice with two types of
... | cond-mat_str-el |
Photoemission spectra of LaMnO3 controlled by orbital excitations: We investigate the spectral function of a hole moving in the orbital-ordered
ferromagnetic planes of LaMnO$_3$, and show that it depends critically on the
type of orbital ordering. While the hole does not couple to the spin
excitations, it interacts str... | cond-mat_str-el |
Finite-temperature dynamic structure factor of the spin-1 XXZ chain with
single-ion anisotropy: Improving matrix-product state techniques based on the purification of the
density matrix, we are able to accurately calculate the finite-temperature
dynamic response of the infinite spin-1 XXZ chain with single-ion anisot... | cond-mat_str-el |
Local atomic and magnetic structure of multiferroic (Sr,Ba)(Mn,Ti)O$_3$: We present a detailed study of the local atomic and magnetic structure of the
type-I multiferroic perovskite system (Sr,Ba)(Mn,Ti)O$_3$ using x-ray and
neutron pair distribution function (PDF) analysis, polarized neutron
scattering, and muon spin ... | cond-mat_str-el |
A robust but disordered collapsed-volume phase in a cerium alloy under
the application of pulsed magnetic fields: We report synchrotron x-ray powder diffraction measurements of
Ce0.8La0.1Th0.1 subject to pulsed magnetic fields as high as 28 Tesla. This
alloy is known to exhibit a continuous volume collapse on cooling... | cond-mat_str-el |
The Effect of Randomness on the Mott State: We reinvestigate the competition between the Mott and the Anderson insulator
state in a one-dimensional disordered fermionic system by a combination of
instanton and renormalization group methods. Tracing back both the
compressibility and the ac-conductivity to a vanishing ki... | cond-mat_str-el |
Magnetic effects at the interface between nonmagnetic oxides: The electronic reconstruction at the interface between two insulating oxides
can give rise to a highly-conductive interface. In analogy to this remarkable
interface-induced conductivity we show how, additionally, magnetism can be
induced at the interface bet... | cond-mat_str-el |
Global phase diagram of the spin-1 antiferromagnet with uniaxial
anisotropy on the kagome lattice: The phase diagram of the XXZ spin-1 quantum magnet on the kagome lattice is
studied for all cases where the $J_z$ coupling is antiferromagnetic. In the
zero magnetic field case, the six previously introduced phases, fou... | cond-mat_str-el |
Strong electronic correlations in superconducting organic charge
transfer salts: We review the role of strong electronic correlations in
quasi--two-dimensional organic charge transfer salts such as (BEDT-TTF)$_2X$,
(BETS)$_2Y$ and $\beta'$-[Pd(dmit)$_2$]$_2Z$. We begin by defining minimal
models for these materials. ... | cond-mat_str-el |
Critical Metal Phase at the Anderson Metal-Insulator Transition with
Kondo Impurities: It is well-known that magnetic impurities can change the symmetry class of
disordered metallic systems by breaking spin and time-reversal symmetry. At low
temperature these symmetries can be restored by Kondo screening. It is also
... | cond-mat_str-el |
Hidden Charge Order in an Iron Oxide Square-Lattice Compound: Since the discovery of charge disproportionation in the FeO$_2$
square-lattice compound Sr$_3$Fe$_2$O$_7$ by M\"ossbauer spectroscopy more than
fifty years ago, the spatial ordering pattern of the disproportionated charges
has remained "hidden" to convention... | cond-mat_str-el |
Ground state of S=1 zigzag spin-orbital chain: We investigate ground-state properties of a $t_{\rm 2g}$-orbital Hubbard
model on a zigzag chain relevant for CaV$_{2}$O$_{4}$, by exploiting numerical
techniques such as Lanczos diagonalization and density-matrix renormalization
group. Assuming a V$^{3+}$ ion, a local spi... | cond-mat_str-el |
Evidence for a fractional quantum Hall state with anisotropic
longitudinal transport: At high magnetic fields, where the Fermi level lies in the N=0 lowest Landau
level (LL), a clean two-dimensional electron system (2DES) exhibits numerous
incompressible liquid phases which display the fractional quantized Hall effec... | cond-mat_str-el |
How do we interrogate the electrons without roughing them up?: Electrons are indistinguishable, but the energy of each electron is different
in different materials and if we can exploit this energy, then we can
systematically study the changes of electronic properties in non free-electron
metals. | cond-mat_str-el |
Entanglement and Topology in Su-Schrieffer-Heeger Cavity Quantum
Electrodynamics: Cavity materials are a frontier to investigate the role of light-matter
interactions on the properties of electronic phases of matter. In this work, we
raise a fundamental question: can non-local interactions mediated by cavity
photons ... | cond-mat_str-el |
From order to randomness: Onset and evolution of the random-singlet
state in bond-disordered BaCu$_2$(Si$_{1-x}$Ge$_x$)$_2$O$_7$ spin-chain
compounds: Heisenberg-type spin-chain materials have been extensively studied over the
years, yet not much is known about their behavior in the presence of disorder.
Starting f... | cond-mat_str-el |
Quantum-critical transport of marginal Fermi-liquids: We present exact results for the electrical and thermal conductivity and
Seebeck coefficient at low temperatures and frequencies in the quantum-critical
region for fermions on a lattice scattering with the collective fluctuations of
the quantum xy model. This is don... | cond-mat_str-el |
The chemical bond as an emergent phenomenon: We first argue that the covalent bond and the various closed-shell
interactions can be thought of as symmetry broken versions of one and the same
interaction, viz., the multi-center bond. We use specially chosen molecular
units to show that the symmetry breaking is controlle... | cond-mat_str-el |
First-Order Reversal Curves of the Magnetostructural Phase Transition in
FeTe: We apply the first-order reversal curve (FORC) method, borrowed from studies
of ferromagnetic materials, to the magneto-structural phase transition of FeTe.
FORC measurements reveal two features in the hysteretic phase transition, even
in ... | cond-mat_str-el |
Two ferromagnetic phases in La1-xSrxMnO3(x ~1/8): It was discovered in La1-xSrxMnO3(x~1/8) that a field induced phase
transition occurs from a ferromagnetic metal(FM) phase to a ferromagnetic
insulator (FI) phase. The magnetization shows a sharp jump at the transition
field accompanying with a remarkable increase of ma... | cond-mat_str-el |
Doping evolution of the electron-hole asymmetric s-wave pseudogap in
underdoped high-Tc cuprate superconductors: We study the doping evolution of the electronic structure in the pseudogap
state of high-Tc cuprate superconductors, by means of a cluster extension of
the dynamical mean-field theory applied to the two-di... | cond-mat_str-el |
The spatial range of the Kondo effect: a numerical analysis: The spatial length of the Kondo screening is still a controversial issue
related to Kondo physics. While renormalization group and Bethe Anzats
solutions have provided detailed information about the thermodynamics of
magnetic impurities, they are insufficient... | cond-mat_str-el |
On the existence of the excitonic insulator phase in the extended
Falicov-Kimball model: an SO(2)-invariant slave-boson approach: We re-examine the three-dimensional spinless Falicov-Kimball model with
dispersive $f$ electrons at half-filling, addressing the dispute about the
formation of an excitonic condensate, whi... | cond-mat_str-el |
Thermal Conductivity due to Spinons in the One-Dimensional Quantum Spin
System Sr2V3O9: We have measured the thermal conductivity along different directions of the S
= 1/2 one-dimensional (1D) spin system Sr2V3O9 in magnetic fields up to 14 T.
It has been found that the thermal conductivity along the [10-1] direction... | cond-mat_str-el |
Effects of electron coupling to intra- and inter-molecular vibrational
modes on the transport properties of single crystal organic semiconductors: Electron coupling to intra- and inter-molecular vibrational modes is
investigated in models appropriate to single crystal organic semiconductors,
such as oligoacenes. Focu... | cond-mat_str-el |
Effects of Dissipation on Solitons in the Hydrodynamic Regime of
Graphene: We use hydrodynamic techniques to analyze the one-dimensional propagation of
solitons in gated graphene on an arbitrary uniform background current. Results
are derived for both the Fermi liquid and Dirac fluid regimes. We find that
these solut... | cond-mat_str-el |
Conserving quasiparticle calculations for small metal clusters: A novel approach for GW-based calculations of quasiparticle properties for
finite systems is presented, in which the screened interaction is obtained
directly from a linear response calculation of the density-density correlation
function. The conserving na... | cond-mat_str-el |
Laser-excited ultrahigh-resolution photoemission spectroscopy of
NaxCoO2.yH2O:Evidence for pseudogap formation: We have studied the temperature-dependent electronic structure near the Fermi
level (EF) of the layered cobaltate superconductor, Na0.35CoO2.1.3H2O, and
related materials, using laser-excited ultrahigh-reso... | cond-mat_str-el |
Current response of nonequilibrium steady states in Landau-Zener
problem: Nonequilibrium Green's function approach: The carrier generation in insulators subjected to strong electric fields is
characterized by the Landau-Zener formula for the tunneling probability with a
nonperturbative exponent. Despite its long hist... | cond-mat_str-el |
Anisotropic optical properties of detwinned BaFe$_{2}$As$_{2}$: The optical properties of a large, detwinned single crystal of BaFe$_2$As$_2$
have been examined over a wide frequency range above and below the structural
and magnetic transition at $T_{\rm N}\simeq 138$ K. Above $T_{\rm N}$ the real
part of the optical c... | cond-mat_str-el |
Some exact results for the zero-bandwidth extended Hubbard model with
intersite charge and magnetic interactions: The extended Hubbard model in the zero-bandwidth limit is studied. The
effective Hamiltonian consists of (i) on-site $U$ interaction and intersite
(ii) density-density interaction $W$ and (iii) Ising-like... | cond-mat_str-el |
Strongly-correlated crystal-field approach to 3d oxides - the orbital
magnetism in 3d-ion compounds: We have developed the crystal-field approach with strong electron
correlations, extended to the Quantum Atomistic Solid-State theory (QUASST), as
a physically relevant theoretical model for the description of electron... | cond-mat_str-el |
The Temperature Evolution of the Out-of-Plane Correlation Lengths of
Charge-Stripe Ordered La(1.725)Sr(0.275)NiO(4): The temperature dependence of the magnetic order of stripe-ordered
La(1.725)Sr(0.275)NiO(4) is investigated by neutron diffraction. Upon cooling,
the widths if the magnetic Bragg peaks are observed to ... | cond-mat_str-el |
Magnetic properties of pressurized CsV$_{3}$Sb$_{5}$ calculated by using
a hybrid functional: Based on the hybrid functional, we find that at 0 GPa, the pristine
CsV$_{3}$Sb$_{5}$ has local magnetic moment of 0.85 $\mu_B$ /unit cell, which
is suppressed at pressure of 2.5 GPa resulting in a spin-crossover. Since the
... | cond-mat_str-el |
Stroboscopic Symmetry-Protected Topological Phases: Symmetry-protected topological (SPT) phases of matter have been the focus of
many recent theoretical investigations, but controlled mechanisms for
engineering them have so far been elusive. In this work, we demonstrate that by
driving interacting spin systems periodic... | cond-mat_str-el |
Spin Liquid State in the 3D Frustrated Antiferromagnet PbCuTe2O6: NMR
and muSR Studies: PbCuTe2O6 is a rare example of a spin liquid candidate featuring a three
dimensional magnetic lattice. Strong geometric frustration arises from the
dominant antiferromagnetic interaction which generates a hyperkagome network of
Cu... | cond-mat_str-el |
Simple parametrization for the ground-state energy of the infinite
Hubbard chain incorporating Mott physics, spin-dependent phenomena and
spatial inhomogeneity: Simple analytical parametrizations for the ground-state energy of the
one-dimensional repulsive Hubbard model are developed. The charge-dependence of
the e... | cond-mat_str-el |
Metal-insulator transition and local-moment collapse in negative
charge-transfer CaFeO$_3$ under pressure: We compute the electronic structure, spin and charge state of Fe ions, and
structural phase stability of paramagnetic CaFeO$_3$ under pressure using a
fully self-consistent in charge density DFT+dynamical mean-f... | cond-mat_str-el |
Dynamical Signature of Fractionalization at the Deconfined Quantum
Critical Point: Deconfined quantum critical points govern continuous quantum phase
transitions at which fractionalized (deconfined) degrees of freedom emerge.
Here we study dynamical signatures of the fractionalized excitations in a
quantum magnet (th... | cond-mat_str-el |
From Kosterlitz-Thouless to Pokrovsky-Talapov transitions in spinless
fermions and spin chains with next-nearest neighbour interactions: We investigate the nature of the quantum phase transition out of
charge-density-wave phase in the spinless fermion model with nearest- and
next-nearest-neighbor interaction at one-t... | cond-mat_str-el |
A finite-frequency functional RG approach to the single impurity
Anderson model: We use the Matsubara functional renormalization group (FRG) to describe
electronic correlations within the single impurity Anderson model. In contrast
to standard FRG calculations, we account for the frequency-dependence of the
two-parti... | cond-mat_str-el |
Graded Projected Entangled-Pair State Representations and An Algorithm
for Translationally Invariant Strongly Correlated Electronic Systems on
Infinite-Size Lattices in Two Spatial Dimensions: An algorithm to find a graded Projected Entangled-Pair State representation
of the ground state wave functions is developed... | cond-mat_str-el |
Spin and orbital ordering in double-layered manganites: We study theoretically the phase diagram of the double-layered perovskite
manganites taking into account the orbital degeneracy, the strong Coulombic
repulsion, and the coupling with the lattice deformation. Observed spin
structural changes as the increased doping... | cond-mat_str-el |
Electric field-induced Skyrmion distortion and giant lattice rotation in
the magnetoelectric insulator Cu2OSeO3: Uniquely in Cu2OSeO3, the Skyrmions, which are topologically protected
magnetic spin vortex-like objects, display a magnetoelectric coupling and can
be manipulated by externally applied electric (E) fields... | cond-mat_str-el |
Effects of Backflow Correlation in the Three-Dimensional Electron Gas:
Quantum Monte Carlo Study: The correlation energy of the homogeneous three-dimensional interacting
electron gas is calculated using the variational and fixed-node diffusion Monte
Carlo methods, with trial functions that include backflow and three-... | cond-mat_str-el |
Tuning the Magnetic Ground State by Charge Transfer Energy in SrCoO2.5
via Strain Engineering: SrCoO2.5 (SCO) is a charge transfer insulator with 3d6 ground state
configuration leading to antiferromagnetic nature. It is observed that
substrate induced strain engineering modifies the ground state of SCO thin film
with... | cond-mat_str-el |
Role of surface states in STM spectroscopy of (111) metal surfaces with
Kondo adsorbates: A nearly-free-electron (NFE) model to describe STM spectroscopy of (111)
metal surfaces with Kondo impurities is presented. Surface states are found to
play an important role giving a larger contribution to the conductance in th... | cond-mat_str-el |
Interacting surface states of three-dimensional topological insulators: We numerically investigate the surface states of a strong topological
insulator in the presence of strong electron-electron interactions. We choose a
spherical topological insulator geometry to make the surface amenable to a
finite size analysis. T... | cond-mat_str-el |
Spectroscopic signatures and origin of a hidden order in Ba$_2$MgReO$_6$: Clarifying the underlying mechanisms that govern ordering transitions in
condensed matter systems is crucial for comprehending emergent properties and
phenomena. While transitions are often classified as electronically driven or
lattice-driven, w... | cond-mat_str-el |
Dynamical vertex approximation for the two-dimensional Hubbard model: Recently, diagrammatic extensions of dynamical mean field theory (DMFT) have
been proposed for including short- and long-range correlations beyond DMFT on
an equal footing. We employ one of these, the dynamical vertex approximation
(D$\Gamma$A), and ... | cond-mat_str-el |
Effect of Li doping on magnetic and transport properties of CoV2O4 and
FeV2O4: The structural, magnetic and transport properties have been studied of Li
doped CoV2O4 and FeV2O4. Li doping increases the ferri-magnetic ordering
temperature of both the samples but decreases the spin-glass transition
temperature of CoV2O... | cond-mat_str-el |
Quasiparticle evolution and pseudogap formation in V2O3: An infrared
spectroscopy study: The infrared conductivity of V2O3 is measured in the whole phase diagram.
Quasiparticles appear above the Neel temperature TN and eventually disappear
further enhancing the temperature, leading to a pseudogap in the optical
spect... | cond-mat_str-el |
Hubbard nanoclusters far from equilibrium: The Hubbard model is a prototype for strongly correlated many-particle
systems, including electrons in condensed matter and molecules, as well as for
fermions or bosons in optical lattices. While the equilibrium properties of
these systems have been studied in detail, the none... | cond-mat_str-el |
Partition Functions of Strongly Correlated Electron Systems as
"Fermionants": We introduce a new mathematical object, the "fermionant"
${\mathrm{Ferm}}_N(G)$, of type $N$ of an $n \times n$ matrix $G$. It
represents certain $n$-point functions involving $N$ species of free fermions.
When N=1, the fermionant reduces t... | cond-mat_str-el |
Superfluid--Insulator Transition in Strongly Disordered One-dimensional
Systems: We present an asymptotically exact renormalization-group theory of the
superfluid--insulator transition in one-dimensional disordered systems, with
emphasis on an accurate description of the interplay between the
Giamarchi--Schulz (insta... | cond-mat_str-el |
Repulsive Fermi gases in a two-dimensional lattice with non-Abelian
gauge fields: Motivated by the recent experiment realizing bidirectional spin-orbit-coupled
Bose-Einstein condensates (BEC), we theoretically explore the properties of
repulsive fermions in the two-dimensional (2D) optical lattice with such
non-Abeli... | cond-mat_str-el |
Topological Equivalence between the Fibonacci Quasicrystal and the
Harper Model: One-dimensional quasiperiodic systems, such as the Harper model and the
Fibonacci quasicrystal, have long been the focus of extensive theoretical and
experimental research. Recently, the Harper model was found to be topologically
nontriv... | cond-mat_str-el |
Two-particle self-consistent approach for broken symmetry phases: Spontaneous symmetry breaking of interacting fermion systems constitutes a
major challenge for many-body theory due to the proliferation of new
independent scattering channels once absent or degenerate in the symmetric
phase. One example is given by the ... | cond-mat_str-el |
Quantum phase transitions in antiferromagnets and superfluids: We present a general introduction to the non-zero temperature dynamic and
transport properties of low-dimensional systems near a quantum phase
transition. Basic results are reviewed in the context of experiments on the
spin-ladder compounds, insulating two-... | cond-mat_str-el |
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