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Phonon-Dressed Two-Dimensional Carriers on the ZnO Surface: Two-dimensional (2D) metallic states formed on the ZnO(10$\bar{1}$0) surface
by hydrogen adsorption have been investigated using angle-resolved
photoelectron spectroscopy (ARPES). The observed metallic state is
characterized by a peak-dip-hump structure at jus... | cond-mat_str-el |
Semiclassical description of anisotropic magnets for spin S=1: In this paper, nonlinear equations describing one-dimensional non-Heisenberg
ferromagnetic model are studied by use of generalized coherent states in a real
parameterization. Also dissipative spin wave equation for dipole and quadruple
branches is obtained ... | cond-mat_str-el |
Hall coefficient diagnostics of surface state in pressurized SmB6: In this study, we report the first results of the high-pressure Hall
coefficient (RH) measurements in the putative topological Kondo insulator SmB6
up to 37 GPa. Below 10 GPa, our data reveal that RH(T) exhibits a prominent
peak upon cooling below 20 K.... | cond-mat_str-el |
Gutzwiller Density Functional Theory: a formal derivation and
application to ferromagnetic nickel: We present a detailed derivation of the Gutzwiller Density Functional Theory
that covers all conceivable cases of symmetries and Gutzwiller wave functions.
The method is used in a study of ferromagnetic nickel where we ... | cond-mat_str-el |
Quantum phase transitions and superconductivity in the pressurized
heavy-fermion compound CeCuP2: The tilted balance among competing interactions can yield a rich variety of
ground states of quantum matter. In most Ce-based heavy fermion systems, this
can often be qualitatively described by the famous Doniach phase d... | cond-mat_str-el |
Strong Correlation, Bloch Bundle Topology and Spinless Haldane-Hubbard
Model: Different realizations of the Hubbard operators in different Hilbert spaces
give rise to various microscopic lattice electron models driven by strong
correlations. In terms of the Gutzwiller projected operators, the most familiar
examples a... | cond-mat_str-el |
Spin-gap opening accompanied by a strong magnetoelastic response in the
S=1 magnetic dimer system Ba3BiRu2O9: Neutron diffraction, magnetization, resistivity, and heat capacity
measurements on the 6H-perovskite Ba3BiRu2O9 reveal simultaneous magnetic and
structural dimerization driven by strong magnetoelastic couplin... | cond-mat_str-el |
Non-local scaling operators with entanglement renormalization: The multi-scale entanglement renormalization ansatz (MERA) can be used, in
its scale invariant version, to describe the ground state of a lattice system
at a quantum critical point. From the scale invariant MERA one can determine
the local scaling operators... | cond-mat_str-el |
Current orderings of interacting electrons in bilayer graphene: By taking into account the possibility of all the intralayer as well as the
interlayer current orderings, we derive an eight-band model for interacting
electrons in bilayer graphene. With the numerical solution to the model, we
show that only the current o... | cond-mat_str-el |
Evaluation of High Order Terms for the Hubbard Model in the
Strong-coupling Limit: The ground-state energy of the Hubbard model on a Bethe lattice with infinite
connectivity at half filling is calculated for the insulating phase. Using
Kohn's transformation to derive an effective Hamiltonian for the
strong-coupling l... | cond-mat_str-el |
Emergence of the XY-like phase in the deformed spin-3/2 AKLT systems: Affleck, Kennedy, Lieb and Taski (AKLT) constructed an exemplary spin-3/2
valence-bond solid (VBS) state on the hexagonal lattice, which is the ground
state of an isotropic quantum antiferromagnet and possesses no spontaneous
magnetization but finite... | cond-mat_str-el |
Crucial role of Internal Collective Modes in Underdoped Cuprates: The enigmatic cuprate superconductors have attracted resurgent interest with
several recent reports and discussions of competing orders in the underdoped
side. Motivated by this, here we address the natural question of fragility of
the d-wave superconduc... | cond-mat_str-el |
Kondo resonances and Fano antiresonances in transport through quantum
dots: The transmission of electrons through a non-interacting tight-binding chain
with an interacting side quantum dot (QD) is analized. When the Kondo effect
develops at the dot the conductance presents a wide minimum, reaching zero at
the unitary... | cond-mat_str-el |
Theory of Large Intrinsic Spin Hall Effect in Iridate Semimetals: We theoretically investigate the mechanism to generate large intrinsic spin
Hall effect in iridates or more broadly in 5d transition metal oxides with
strong spin-orbit coupling. We demonstrate such a possibility by taking the
example of orthorhombic per... | cond-mat_str-el |
A non-perturbative study of bulk photovoltaic effect enhanced by an
optically induced phase transition: Solid systems with strong correlations and interactions under light
illumination have the potential for exhibiting interesting bulk photovoltaic
behavior in the non-perturbative regime, which has remained largely u... | cond-mat_str-el |
Competeing orders in spin-1 and spin-3/2 XXZ Kagome antiferromagnets: A
series expansion study: We study the competition between $\sqrt{3} \times \sqrt{3}$ (RT3) and $q=0$
(Q0) magnetic orders in spin-one and spin-$3/2$ Kagome-lattice XXZ
antiferromagnets with varying XY anisotropy parameter $\Delta$, using series
ex... | cond-mat_str-el |
Diagnostics for plasmon satellites and Hubbard bands in transition metal
oxides: Coulomb correlations between the electrons imprint characteristic signatures
to the spectral properties of materials. Among others, they are at the origin
of a rich phenomenology of satellite features, either stemming from atomic-like
mu... | cond-mat_str-el |
Quantum oscillations in the anomalous phase in Sr3Ru2O7: We report measurements of quantum oscillations detected in the putative
nematic phase of Sr3Ru2O7. Significant improvements in sample purity enabled
the resolution of small amplitude dHvA oscillations between two first order
metamagnetic transitions delimiting th... | cond-mat_str-el |
Multipole Ordering and Fluctuations in f-Electron Systems: We investigate effects of multipole moments in f-electron systems both from
phenomenological and microscopic viewpoints. First, we discuss significant
effects of octupole moment on the magnetic susceptibility in a paramagnetic
phase. It is found that even withi... | cond-mat_str-el |
Thermal conductivity of anisotropic and frustrated spin-1/2 chains: We analyze the thermal conductivity of anisotropic and frustrated spin-1/2
chains using analytical and numerical techniques. This includes mean-field
theory based on the Jordan-Wigner transformation, bosonization, and exact
diagonalization of systems w... | cond-mat_str-el |
Orbital Localization and Delocalization Effects in the U 5f^2
Configuration: Impurity Problem: Anderson models, based on quantum chemical studies of the molecule of
U(C_8H_8)_2, are applied to investigate the problem of an U impurity in a
metal. The special point here is that the U 5f-orbitals are divided into two
su... | cond-mat_str-el |
Kinetic theory of the non-local electrodynamic response in anisotropic
metals: skin effect in 2D systems: The electrodynamic response of ultra-pure materials at low temperatures
becomes spatially non-local. This non-locality gives rise to phenomena such as
hydrodynamic flow in transport and the anomalous skin effect ... | cond-mat_str-el |
Low rank Green's function representations applied to dynamical
mean-field theory: Several recent works have introduced highly compact representations of
single-particle Green's functions in the imaginary time and Matsubara frequency
domains, as well as efficient interpolation grids used to recover the
representations... | cond-mat_str-el |
Are multiphase competition & order-by-disorder the keys to understanding
Yb2Ti2O7?: If magnetic frustration is most commonly known for undermining long-range
order, as famously illustrated by spin liquids, the ability of matter to
develop new collective mechanisms in order to fight frustration is no less
fascinating,... | cond-mat_str-el |
From itinerant to local-moment antiferromagnetism in Kondo lattices:
Adiabatic continuity vs. quantum phase transitions: Motivated by both experimental and theoretical activities, we discuss the
fate of Kondo screening and possible quantum phase transitions in
antiferromagnetically ordered phases of Kondo lattices. W... | cond-mat_str-el |
Hund electronic correlation in La$_3$Ni$_2$O$_7$ under high pressure: By means of density functional theory plus dynamical mean-field theory
(DFT+DMFT), we investigate the correlated electronic structures of
La$_3$Ni$_2$O$_7$ under high pressure. Our calculations show that
La$_3$Ni$_2$O$_7$ is a multi-orbital Hund meta... | cond-mat_str-el |
Screened hybrid functional applied to 3d^0-->3d^8 transition-metal
perovskites LaMO3 (M=Sc-Cu): influence of the exchange mixing parameter on
the structural, electronic and magnetic properties: We assess the performance of the Heyd-Scuseria-Ernzerhof (HSE) screened
hybrid density functional scheme applied to the pe... | cond-mat_str-el |
Angular dependence of Hall effect and magnetoresistance in
SrRuO$_3$-SrIrO$_3$ heterostructures: Perovskite SrRuO$_3$ is a prototypical itinerant ferromagnet which allows
interface engineering of its electronic and magnetic properties. We report
synthesis and investigation of atomically flat artificial multilayers of... | cond-mat_str-el |
Anisotropic magnetoresistance and piezoelectric effect in GaAs Hall
samples: In this work, we argue that an anisotropic interaction potential may
stabilize anisotropic liquid phases of electrons even in a strong magnetic
field regime where normally one expects to see only isotropic quantum Hall or
isotropic Fermi liq... | cond-mat_str-el |
Magnetic Order in Laser-Irradiated Kagome Antiferromagnets: Dispersionless "zero energy mode'' is one of the hallmarks of frustrated
kagome antiferromagnets (KAFMs). It points to extensive classically degenerate
ground-states. The "zero energy mode'' can be observed experimentally when
lifted to a flat mode at finite e... | cond-mat_str-el |
Inducing topological order in a honeycomb lattice: We explore the possibility of inducing a topological insulator phase in a
honeycomb lattice lacking spin-orbit interaction using a metallic (or Fermi
gas) environment. The lattice and the metallic environment interact through a
density-density interaction without parti... | cond-mat_str-el |
Spectral signatures of the Luttinger liquid to charge-density-wave
transition: Electron- and phonon spectral functions of the one-dimensional,
spinless-fermion Holstein model at half filling are calculated in the four
distinct regimes of the phase diagram, corresponding to an attractive or
repulsive Luttinger liquid ... | cond-mat_str-el |
Ground-State Phase Diagram of (1/2,1/2,1) Mixed Diamond Chains: The ground-state phases of mixed diamond chains with ($S, \tau^{(1)},
\tau^{(2)})=(1/2,1/2,1)$, where $S$ is the magnitude of vertex spins, and
$\tau^{(1)}$ and $\tau^{(2)}$ are those of apical spins, are investigated. The
two apical spins in each unit cel... | cond-mat_str-el |
The free energy of anisotropic quantum spin systems: Functional integral
representation: In this work, we propose a method for calculating the free energy of
anisotropic quantum spin systems. We use the Hubbard-Stratonovich
transformation to express the partition function of a generic bilinear
super-exchange Hamilton... | cond-mat_str-el |
The electronic structure of the high-symmetry perovskite iridate Ba2IrO4: We report angle-resolved photoemission (ARPES) measurements, density
functional and model tight-binding calculations on Ba$_2$IrO$_4$ (Ba-214), an
antiferromagnetic ($T_N=230$ K) insulator. Ba-214 does not exhibit the
rotational distortion of the... | cond-mat_str-el |
Field induced tricritical behavior in the S=1/2 quasi one-dimensional
frustrated Ising antiferromagnet: The results of extensive histogram cluster heat-bath Monte Carlo simulations
on the critical behavior of the quasi-one dimensional Ising antiferromagnet on
a stacked triangular lattice are presented. A small applie... | cond-mat_str-el |
Diagrammatic quantum Monte Carlo study of an acoustic lattice polaron: We present the first approximation free diagrammatic Monte Carlo study of a
lattice polaron interacting with an acoustic phonon branch through the
deformation potential. Weak and strong coupling regimes are separated by a
self-trapping region where ... | cond-mat_str-el |
Quantum Skyrmion Lattices in Heisenberg Ferromagnets: Skyrmions are topological magnetic textures that can arise in
non-centrosymmetric ferromagnetic materials. In most systems experimentally
investigated to date, skyrmions emerge as classical objects. However, the
discovery of skyrmions with nanometer length scales ha... | cond-mat_str-el |
LDA+DMFT approach to resonant inelastic x-ray scattering in correlated
materials: We present a computational study of $L$-edge resonant inelastic x-ray
scattering (RIXS) in correlated 3$d$ transition-metal oxides using an $ab$
$initio$ method based on local density approximation + dynamical mean-field
theory (DMFT). ... | cond-mat_str-el |
Magnetic model for A2CuP2O7 (A = Na, Li) revisited: 1D versus 2D
behavior: We report magnetization measurements, full-potential band structure
calculations, and microscopic modeling for the spin-1/2 Heisenberg magnets
A2CuP2O7 (A = Na, Li). Based on a quantitative evaluation of the leading
exchange integrals and the ... | cond-mat_str-el |
Topological Blocking in Quantum Quench Dynamics: We study the non-equilibrium dynamics of quenching through a quantum critical
point in topological systems, focusing on one of their defining features:
ground state degeneracies and associated topological sectors. We present the
notion of 'topological blocking', experien... | cond-mat_str-el |
Orbital polarons in the metal-insulator transition of manganites: The metal-insulator transition in manganites is strongly influenced by the
concentration of holes present in the system. Based upon an orbitally
degenerate Mott-Hubbard model we analyze two possible localization scenarios to
account for this doping depen... | cond-mat_str-el |
Quantized gravitational responses and the sign problem: It is believed that not all quantum systems can be simulated efficiently
using classical computational resources. This notion is supported by the fact
that in quantum Monte Carlo (QMC) simulations for a large number of important
problems it is not known how to exp... | cond-mat_str-el |
Unconventional many-body phase transitions in a non-Hermitian Ising
chain: We study many-body phase transitions in a one-dimensional ferromagnetic
transversed field Ising model with an imaginary field and show that the system
exhibits three phase transitions: one second-order phase transition and two
$\mathcal{PT}$ p... | cond-mat_str-el |
Matrix product states approaches to operator spreading in ergodic
quantum systems: We review different tensor network approaches to study the spreading of
operators in generic nonintegrable quantum systems. As a common ground to all
methods, we quantify this spreading by means of the Frobenius norm of the
commutator ... | cond-mat_str-el |
Charge collective modes in strongly correlated electron systems with
long range interactions: Elucidating the impact of strong electronic correlations on the collective
modes of metallic systems has been of longstanding interest, mainly due to the
inadequacy of the random phase approximation (RPA) in the strongly cor... | cond-mat_str-el |
Relativistic and thermal effects on the magnon spectrum of a
ferromagnetic monolayer: A spin model including magnetic anisotropy terms and Dzyaloshinsky-Moriya
interactions is studied for the case of a ferromagnetic monolayer with C2v
symmetry like Fe/W(110). Using the quasiclassical stochastic
Landau-Lifshitz-Gilber... | cond-mat_str-el |
Metal-Insulator-Like Behavior in Semimetallic Bismuth and Graphite: When high quality bismuth or graphite crystals are placed in a magnetic field
directed along the c-axis (trigonal axis for bismuth) and the temperature is
lowered, the resistance increases as it does in an insulator but then
saturates. We show that the... | cond-mat_str-el |
Real Space Coulomb Interaction: A Pairing Glue for FeAs Superconductors: In this paper we present a real space pairing glue for the iron-based layered
superconductors. It is shown that two static electrons embedded symmetrically
into two adjacent Fe plaquettes of the superconductor can be bounded due to the
Coulombic i... | cond-mat_str-el |
Anomalies in bosonic SPT edge theories: connection to F-symbols and a
method for calculation: We describe a systematic procedure for determining the identity of a 2D
bosonic symmetry protected topological (SPT) phase from the properties of its
edge excitations. Our approach applies to general bosonic SPT phases with
... | cond-mat_str-el |
From the double-exchange Hamiltonian to the $t-J$ model: Classical spins: From the double-exchange Hamiltonian with classical localized spins in the
limit of large but finit Hund exchange coupling we obtain the $t-J$ model (with
classical localized spins). | cond-mat_str-el |
Theory of Twist Liquids: Gauging an Anyonic Symmetry: Topological phases in (2+1)-dimensions are frequently equipped with global
symmetries, like conjugation, bilayer or electric-magnetic duality, that
relabel anyons without affecting the topological structures. Twist defects are
static point-like objects that permute ... | cond-mat_str-el |
Thermal drag in spin ladders coupled to phonons: We study the spin-phonon drag effect in the magnetothermal transport of
spin-1/2 two-leg ladders coupled to lattice degrees of freedom. Using a bond
operator description for the triplon excitations of the spin ladder and
magnetoelastic coupling to acoustic phonons, we em... | cond-mat_str-el |
Twofold van Hove singularity and origin of charge order in topological
kagome superconductor CsV3Sb5: The layered vanadium antimonides AV3Sb5 (A = K, Rb, Cs) are a recently
discovered family of topological kagome metals with a rich phenomenology of
strongly correlated electronic phases including charge order and
supe... | cond-mat_str-el |
A Gate-tunable Polarized Phase of Two-Dimensional Electrons at the
LaAlO3/SrTiO3 Interface: Controlling the coupling between localized spins and itinerant electrons can
lead to exotic magnetic states. A novel system featuring local magnetic moments
and extended 2D electrons is the interface between LaAlO3 and SrTiO3.... | cond-mat_str-el |
Strong enhancement of magnetic order from bulk to stretched monolayer
FeSe as Hund's metals: Despite of the importance of magnetism in possible relation to other key
properties in iron-based superconductors, its understanding is still far from
complete especially for FeSe systems. On one hand, the origin of the absen... | cond-mat_str-el |
How does a quadratic term in the energy dispersion modify the
single-particle Green's function of the Tomonaga-Luttinger model?: We calculate the effect of a quadratic term in the energy dispersion on the
low-energy behavior of the Green's function of the spinless Tomonaga-Luttinger
model (TLM). Assuming that for sma... | cond-mat_str-el |
Dynamical Mean-Field Theory for Doped Antiferromagnets: We have generalized the dynamical mean-field theory to study the doping
dependence of the crossover from antiferromagnetic to short-range order
modelled by an incommensurate spin density wave in the Hubbard model. The local
selfenergy which includes spin fluctuati... | cond-mat_str-el |
Doped carrier formulation of the t-J model: the projection constraint
and the effective Kondo-Heisenberg lattice representation: We show that the recently proposed doped carrier Hamiltonian formulation of
the t-J model should be complemented with the constraint that projects out the
unphysical states. With this new i... | cond-mat_str-el |
Orbital-selective Mott transitions in two-band Hubbard models: The anisotropic two-orbital Hubbard model is investigated at low temperatures
using high-precision quantum Monte Carlo (QMC) simulations within dynamical
mean-field theory (DMFT). We demonstrate that two distinct orbital-selective
Mott transitions (OSMTs) o... | cond-mat_str-el |
Topological and trivial magnetic oscillations in nodal loop semimetals: Nodal loop semimetals are close descendants of Weyl semimetals and possess a
topologically dressed band structure. We argue by combining the conventional
theory of magnetic oscillation with topological arguments that nodal loop
semimetals host coex... | cond-mat_str-el |
Quantum adiabatic theorem for chemical reactions and systems with
time-dependent orthogonalization: A general quantum adiabatic theorem with and without the time-dependent
orthogonalization is proven, which can be applied to understand the origin of
activation energies in chemical reactions. Further proofs are also d... | cond-mat_str-el |
The Falicov-Kimball model in external magnetic field: orbital effects: We study thermodynamic properties of the two-dimensional (2D) Falicov-Kimball
model in the presence of external magnetic field perpendicular to the lattice.
The field is taken into account by the Peierls substitution in the hopping
term. In the non-... | cond-mat_str-el |
Excitations and relaxation dynamics in multiferroic GeV4S8 studied by
THz and dielectric spectroscopy: We report on THz time-domain spectroscopy on multiferroic GeV4S8, which
undergoes orbital ordering at a Jahn-Teller transition at 30.5 K and exhibits
antiferromagnetic order below 14.6 K. The THz experiments are com... | cond-mat_str-el |
Electronic Liquid Crystalline Phases in a Spin-Orbit Coupled
Two-Dimensional Electron Gas: We argue that the ground state of a two-dimensional electron gas with Rashba
spin-orbit coupling realizes one of several possible liquid crystalline or
Wigner crystalline phases in the low-density limit, even for short-range
re... | cond-mat_str-el |
Spin-polarization coupling in multiferroic transition-metal oxides: A systematic microscopic theory of magnetically induced ferroelectricity and
lattice modulation is presented for all electron configurations of
Mott-insulating transition-metal oxides. Various mechanisms of polarization are
identified in terms of a str... | cond-mat_str-el |
Determination of intrinsic ferroelectric polarization in lossy improper
ferroelectric systems: We measured the intrinsic hysteretic polarization in lossy improper and
nanoferroelectric systems where the nonhysteretic polarization and leakage are
large and the relaxation takes place over a broader time scale. We used
... | cond-mat_str-el |
Spin Waves in Antiferromagnetic Spin Chains with Long Range Interactions: We study antiferromagnetic spin chains with unfrustrated long-range
interactions that decays as a power law with exponent $\beta$, using the spin
wave approximation. We find for sufficiently large spin $S$, the Neel order is
stable at T=0 for $\b... | cond-mat_str-el |
Spin-orbit physics of j=1/2 Mott insulators on the triangular lattice: The Heisenberg-Kitaev (HK) model on the triangular lattice is conceptually
interesting for its interplay of geometric and exchange frustration. HK models
are also thought to capture the essential physics of the spin-orbital
entanglement in effective... | cond-mat_str-el |
Details of Sample Dependence and Transport Properties of URu2Si2: Resistivity and specific heat measurements were performed in the low carrier
unconventional superconductor URu2Si2 on various samples with very different
qualities. The superconducting transition temperature (TSC) and the hidden
order transition temperat... | cond-mat_str-el |
Interaction Correction of Conductivity Near a Ferromagnetic Quantum
Critical Point: We calculate the temperature dependence of conductivity due to interaction
correction for a disordered itinerant electron system close to a ferromagnetic
quantum critical point which occurs due to a spin density wave instability. In
t... | cond-mat_str-el |
Quantum Wire Hybridized with a Single-Level Impurity: We have studied low-temperature properties of interacting electrons in a
one-dimensional quantum wire (Luttinger liquid) side-hybridized with a
single-level impurity. The hybridization induces a back-scattering of electrons
in the wire which strongly affects its low... | cond-mat_str-el |
Kondo Effect and Persistent Currents in a Mesoscopic Ring: Numerically
Exact Results: We study the persistent current circulating along a mesoscopic ring with a
dot side-coupled to it when threaded by a magnetic field. A cluster including
the dot and its vicinity is diagonalized and embedded into the rest of the
syst... | cond-mat_str-el |
Nonlinear spectroscopy of collective modes in excitonic insulator: The nonlinear optical response of an excitonic insulator coupled to lattice
degrees of freedom is shown to depend in strong and characteristic ways on
whether the insulating behavior originates primarily from electron-electron or
electron-lattice intera... | cond-mat_str-el |
The Chern-Simons Invariant in the Berry Phase of a Two by Two
Hamiltonian: The positive (negaive)-energy eigen vectors of the two by two Hamiltonian
$H=\v{r}\cdot\vec{\s}$ where $\vec{\s}$ are the Pauli matrices and $\v{r}$ is a
3-vector, form a U(1) fiber bundle when $\v{r}$ sweeps over a manifold $\cM$ in
the three... | cond-mat_str-el |
Energetics of Domain Walls in the 2D t-J model: Using the density matrix renormalization group, we calculate the energy of a
domain wall in the 2D t-J model as a function of the linear hole density
\rho_\ell, as well as the interaction energy between walls, for J/t=0.35. Based
on these results, we conclude that the gro... | cond-mat_str-el |
A photo-induced strange metal with electron and hole quasi-particles: Photo-doping of Mott insulators or correlated metals can create an unusual
metallic state which simultaneously hosts hole-like and electron-like
particles. We study the dynamics of this state up to long times, as it passes
its kinetic energy to the e... | cond-mat_str-el |
Spin excitations in metallic kagome lattice FeSn and CoSn: In two-dimensional (2D) metallic kagome lattice materials, destructive
interference of electronic hopping pathways around the kagome bracket can
produce nearly localized electrons, and thus electronic bands that are flat in
momentum space. When ferromagnetic or... | cond-mat_str-el |
The emergence of charged collective modes from a large N extrapolation
of the Hubbard model: We consider a symplectic extrapolation of the Hubbard model of N fold
replicated electrons and solve this model exactly in two special cases, at
N=infinity in the bosonic sector and for any N on a dimer of two points. At
N=in... | cond-mat_str-el |
Heavy holes: precursor to superconductivity in antiferromagnetic CeIn3: Numerous phenomenological parallels have been drawn between f- and d-
electron systems in an attempt to understand their display of unconventional
superconductivity. The microscopics of how electrons evolve from participation
in large moment antife... | cond-mat_str-el |
On planar fermions with quartic interaction at finite temperature and
density: We study the breaking of parity symmetry in the 2+1 Gross-Neveu model at
finite temperature with chemical potential $\mu$, in the presence of an
external magnetic field. We find that the requirement of gauge invariance,
which is considered... | cond-mat_str-el |
Composition and field tuned magnetism and superconductivity in
Nd1-xCexCoIn5: The Nd1-xCexCoIn5 alloys evolve from local moment magnetism (x = 0) to heavy
fermion superconductivity (x =1). Magnetic order is observed over a broad range
of x. For a substantial range of x (0.83 <= x <= 0.95) in the temperature -
composi... | cond-mat_str-el |
Boundary effects in the critical scaling of entanglement entropy in 1D
systems: We present exact diagonalization and density matrix renormalization group
results for the entanglement entropy of critical spin-1/2 XXZ chains. We find
that open boundary conditions induce an alternating term in both the energy
density an... | cond-mat_str-el |
The effects of k-dependent self-energy in the electronic structure of
correlated materials: It is known from self-energy calculations in the electron gas and sp
materials based on the GW approximation that a typical quasiparticle
renormalization factor (Z factor) is approximately 0.7-0.8. Band narrowing in
electron g... | cond-mat_str-el |
Absence of static stripes in the two-dimensional $t{-}J$ model by an
accurate and systematic quantum Monte Carlo approach: We examine the two-dimensional $t{-}J$ model by using variational approach
combined with well established quantum Monte Carlo techniques [S. Sorella {\it
et al.}, \prl {\bf 88}, 117002 (2002)] th... | cond-mat_str-el |
Magnetic Field Effect on Crossover Temperature from Non-Fermi Liquid to
Fermi Liquid Behavior in f^2-Impurity Systems with Crystalline-Electric-Field
Singlet State Competing with Kondo-Yosida Singlet State: We investigate the magnetic field dependence of the physical properties of
f^2-configuration systems with a c... | cond-mat_str-el |
Reply to "Comment on `Orbital-selective Mott transitions in the
anisotropic two-band Hubbard model at finite temperatures'": In a Comment [cond-mat/0506138] on our recent e-print [cond-mat/0505106]
Liebsch claimed "excellent correspondence" between our high-precision quantum
Monte-Carlo (QMC) data for the anisotropic... | cond-mat_str-el |
Crystalline Solutions of Kohn-Sham Equations in the Fractional Quantum
Hall Regime: A Kohn-Sham density functional approach has recently been developed for the
fractional quantum Hall effect, which maps the strongly interacting electrons
into a system of weakly interacting composite fermions subject to an exchange
co... | cond-mat_str-el |
The spin-1 ladder : A bosonization study: We construct a field-theoretic description of two coupled spin-1 Heisenberg
chains, starting with the known representation of a single spin-1 chain in
terms of Majorana fermions (or Ising models). After reexamining the
bosonization rules for two Ising models, taking particular ... | cond-mat_str-el |
Effect of Interdots Electronic Repulsion in the Majorana Signature for a
Double Dot Interferometer: We investigate theoretically the features of the Majorana hallmark in the
presence of Coulomb repulsion between two quantum dots describing a spinless
Aharonov-Bohm-like interferometer, where one of the dots is strongl... | cond-mat_str-el |
Reply to Millis et al. on "A Tale of Two Theories: Quantum Griffiths
Effects in Metallic Systems": In a recent paper (cond-mat/0411197) we showed the equivalence of two
seemingly contradictory theories on Griffiths-McCoy singularities (GMS) in
metallic antiferromagnets close to a quantum critical point (QCP). In a re... | cond-mat_str-el |
Transport in a classical model of an one-dimensional Mott insulator:
Influence of conservation laws: We study numerically how conservation laws affect the optical conductivity
sigma(w) of a slightly doped one-dimensional Mott insulator. We investigate a
regime where the average distance between charge excitations is ... | cond-mat_str-el |
Magnetism and berry phase manipulation in an emergent structure of
perovskite ruthenate by (111) strain engineering: The interplay among symmetry of lattices, electronic correlations, and Berry
phase of the Bloch states in solids has led to fascinating quantum phases of
matter. A prototypical system is the magnetic W... | cond-mat_str-el |
Superconducting properties of Pr-based Filled skutterudite
PrRu$_4$As$_{12}$: We report on systematic study of superconducting characteristics and Pr
crystalline-electric-field (CEF) levels of filled-skutterudite \pra ($T_{\rm
c}$ = 2.33 K). The temperature dependences of the upper critical field $H_{\rm
c2}$ and the... | cond-mat_str-el |
Transfer of spectral weight across the gap of Sr2IrO4 induced by La
doping: We study with Angle Resolved PhotoElectron Spectroscopy (ARPES) the evolution
of the electronic structure of Sr2IrO4, when holes or electrons are introduced,
through Rh or La substitutions. At low dopings, the added carriers occupy the
first ... | cond-mat_str-el |
Conversion of glassy antiferromagnetic-insulating phase to equilibrium
ferromagnetic-metallic phase by devitrification and recrystallization in Al
substituted Pr${_{0.5}}$Ca$_{0.5}$MnO${_3}$: We show that Pr${_{0.5}}$Ca$_{0.5}$MnO${_3}$ with 2.5% Al substitution and
La${_{0.5}}$Ca$_{0.5}$MnO${_3}$ (LCMO) exhibit qu... | cond-mat_str-el |
Comment on arXiv:0811.1575 entitled "Quantum phase transitions in the
Hubbard model on triangular lattice" by T. Yoshioka, A. Koga and N. Kawakami: We show that the phase boundary between the paramagnetic metal and the
nonmagnetic Mott insulator for the Hubbard model on a triangular lattice
obtained by Yoshioka et al... | cond-mat_str-el |
Magnetic order in Tb$_2$Sn$_2$O$_7$ under high pressure: from ordered
spin ice to spin liquid and antiferromagnetic order: We have studied the Tb$_2$Sn$_2$O$_7$ frustrated magnet by neutron
diffraction under isotropic pressure of 4.6 GPa, combined with uniaxial
pressure of 0.3 GPa, in the temperature range 0.06 K$<$T... | cond-mat_str-el |
Abrupt disappearance and reemergence of the SU(2) and SU(4) Kondo
effects due to population inversion: The interplay of almost degenerate levels in quantum dots and molecular
junctions with possibly different couplings to the reservoirs has lead to many
observable phenomena, such as the Fano effect, transmission phas... | cond-mat_str-el |
Emergence of a 2d macro-spin liquid in a highly frustrated 3d quantum
magnet: The classical Ising model on the frustrated 3d swedenborgite lattice has
disordered spin liquid ground states for all ratios of inter- and intra-planar
couplings. Quantum fluctuations due to a transverse field give rise to several
exotic qu... | cond-mat_str-el |
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