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Disordered and interacting parabolic semimetals in two and three
dimensions: A clean noninteracting parabolic semimetal is characterized by quadratic band
touching between the conduction and the valence bands at isolated diabolic
points in the Brillouin zone and describes a fermionic quantum critical system
with dyna... | cond-mat_str-el |
Thickness-dependent magnetic properties and strain-induced orbital
magnetic moment in SrRuO3 thin films: Thin films of the ferromagnetic metal SrRuO3 (SRO) show a varying easy
magnetization axis depending on the epitaxial strain and undergo a
metal-to-insulator transition with decreasing film thickness. We have
inves... | cond-mat_str-el |
Expansion of the tetragonal magnetic phase with pressure in the
iron-arsenide superconductor Ba{1-x}KxFe2As2: In the temperature-concentration phase diagram of most iron-based
superconductors, antiferromagnetic order is gradually suppressed to zero at a
critical point, and a dome of superconductivity forms around tha... | cond-mat_str-el |
Field-Tuned Quantum Effects in a Triangular-Lattice Ising Magnet: We report thermodynamic and neutron scattering measurements of the
triangular-lattice quantum Ising magnet TmMgGaO 4 in longitudinal magnetic
fields. Our experiments reveal a quasi-plateau state induced by quantum
fluctuations. This state exhibits an unc... | cond-mat_str-el |
Antiferromagnetic and d-wave pairing correlations in the strongly
interacting two-dimensional Hubbard model from the functional renormalization
group: Using the dynamical mean-field theory (DMFT) as a `booster-rocket', the
functional renormalization group (fRG) can be upgraded from a weak-coupling
method to a power... | cond-mat_str-el |
Spin Precession and Real Time Dynamics in the Kondo Model: A
Time-Dependent Numerical Renormalization-Group Study: A detailed derivation of the recently proposed time-dependent numerical
renormalization-group (TD-NRG) approach to nonequilibrium dynamics in quantum
impurity systems is presented. We demonstrate that th... | cond-mat_str-el |
Pinball liquid phase from Hund's coupling in frustrated transition metal
oxides: The interplay of non-local Coulomb repulsion and Hund's coupling in the
d-orbital manifold in frustrated triangular lattices is analyzed by a mutliband
extended Hubbard model. We find a rich phase diagram with several competing
phases, i... | cond-mat_str-el |
Spin correlations in Ca3Co2O6: A polarised-neutron diffraction and Monte
Carlo study: We present polarised-neutron diffraction measurements of the Ising-like
spin-chain compound Ca3Co2O6 above and below the magnetic ordering temperature
TN. Below TN, a clear evolution from a single-phase spin-density wave (SDW)
struc... | cond-mat_str-el |
Anderson impurity in the one-dimensional Hubbard model on finite size
systems: An Anderson impurity in a Hubbard model on chains with finite length is
studied using the density-matrix renormalization group (DMRG) technique. In the
first place, we analyzed how the reduction of electron density from
half-filling to qua... | cond-mat_str-el |
Modified Curie-Weiss Law for $j_{\rm eff}$ Magnets: In spin-orbit-coupled magnetic materials, the usually applied Curie-Weiss law
can break down. This is due to potentially sharp temperature-dependence of the
local magnetic moments. We therefore propose a modified Curie-Weiss formula
suitable for analysis of experiment... | cond-mat_str-el |
Low Curie-temperature ferromagnetic phase in SmPt2Cd20 possibly
accompanied by strong quantum fluctuations: Electrical resistivity, magnetization and specific heat have been measured
for single crystals of SmPt$_{2}$Cd$_{20}$. It has been found that
SmPt$_{2}$Cd$_{20}$ exhibits a ferromagnetic (FM) transition at $T_{... | cond-mat_str-el |
Spin polarization induced tenfold magneto-resistivity of highly metallic
2D holes in a narrow GaAs quantum well: We observe that an in-plane magnetic field ($B_{||}$) can induce an order of
magnitude enhancement in the low temperature ($T$) resistivity ($\rho$) of
metallic 2D holes in a narrow (10nm) GaAs quantum wel... | cond-mat_str-el |
X-Ray Resonant Scattering as a Direct Probe of Orbital Ordering in
Transition-Metal Oxides: X-ray resonant scattering at the K-edge of transition metal oxides is shown
to measure the orbital order parameter, supposed to accompany magnetic ordering
in some cases. Virtual transitions to the 3d-orbitals are quadrupolar ... | cond-mat_str-el |
Far Infrared absorption of non center of mass modes and optical sum rule
in a few electron quantum dot with Rashba spin-orbit coupling: Spin-orbit interaction in a quantum dot couples far infrared radiation to non
center of mass excitation modes, even for parabolic confinement and dipole
approximation. The intensitie... | cond-mat_str-el |
Unconventional electron states in $δ$-doped SmTiO$_3$: The Mott-insulating distorted perovskite SmTiO$_3$, doped with a single SrO
layer in a quantum-well architecture is studied by the combination of density
functional theory with dynamical mean-field theory. A rich correlated
electronic structure in line with recent ... | cond-mat_str-el |
Flavor Degeneracy and Effects of Disorder in Ultracold Atom Systems: Cold atoms in optical lattices offer an exciting new laboratory where quantum
many-body phenomena can be realized in a highly controlled way. They can even
serve as quantum simulators for notoriously difficult problems like
high-temperature supercondu... | cond-mat_str-el |
Reduced fidelity in topological quantum phase transitions: We study the reduced fidelity between local states of lattice systems
exhibiting topological order. By exploiting mappings to spin models with
classical order, we are able to analytically extract the scaling behavior of
the reduced fidelity at the corresponding... | cond-mat_str-el |
Development of spin fluctuations under the presence of $d$-wave bond
order in cuprate superconductors: In cuprate superconductors, superconductivity appears below the CDW
transition temperature $T_{CDW}$. However, many-body electronic states under
the CDW order are still far from understood. Here, we study the develo... | cond-mat_str-el |
A Proposal to Use Neutron Scattering to Measure Scalar Spin Chirality
Fluctuations in Kagome Lattices: In the theory of quantum spin liquids, gauge fluctuations are emergent
excitations at low energy. The gauge magnetic field is proportional to the
scalar spin chirality, S1.(S2xS3). It is therefore highly desirable t... | cond-mat_str-el |
Emergent Potts order in the kagomé $J_1-J_3$ Heisenberg model: Motivated by the physical properties of Vesignieite
BaCu$_3$V$_2$O$_8$(OH)$_2$, we study the $J_1-J_3$ Heisenberg model on the
kagom\'e lattice, that is proposed to describe this compound for $J_1<0$ and
$J_3\gg|J_1|$. The nature of the classical ground sta... | cond-mat_str-el |
Theory of inelastic light scattering in spin-1 systems: resonant regimes
and detection of quadrupolar order: Motivated by the lack of an obvious spectroscopic probe to investigate
non-conventional order such as quadrupolar orders in spin S>1/2 systems, we
present a theoretical approach to inelastic light scattering f... | cond-mat_str-el |
lattice-symmetries: A package for working with quantum many-body bases: Exact diagonalization (ED) is one of the most reliable and established
numerical methods of quantum many-body theory. The main limiting factor of the
method is the exponential scaling of Hilbert space dimension with system size.
Fortunately, by sym... | cond-mat_str-el |
Anyonic braiding via quench dynamics in fractional quantum Hall liquids: In a Laughlin fractional quantum Hall state, one- and two-quasihole states
can be obtained by diagonalizing the many-body Hamiltonian with a trapping
potential or, for larger systems, from the linear combination of the edge Jack
polynomials. The q... | cond-mat_str-el |
Metallic mean-field stripes, incommensurability and chemical potential
in cuprates: We perform a systematic slave-boson mean-field analysis of the three-band
model for cuprates with first-principle parameters. Contrary to widespread
believe based on earlier mean-field computations low doping stripes have a
linear den... | cond-mat_str-el |
Localized excitation in the hybridization gap in YbAl3: The intermediate valence compound YbAl3 exhibits a broad magnetic excitation
with characteristic energy E1 ~ 50meV, of order of the Kondo energy (TK ~
600-700K). In the low temperature (T < Tcoh ~ 40K) Fermi liquid state, however,
a new magnetic excitation arises ... | cond-mat_str-el |
Theory of Low-Temperature Hall Effect in Stripe--Ordered Cuprates: We investigate the effect of static anti-phase stripe order on the weak-field
Hall effect of electrons on a two-dimensional square lattice with electron
dispersion appropriate to the high T$_c$ cuprates. We first consider the cases
where the magnitudes ... | cond-mat_str-el |
Magnetic phase diagram of a spin S=1/2 antiferromagnetic two-leg ladder
in the presence of modulated along legs Dzyaloshinskii-Moriya interaction: We study the ground-state magnetic phase diagram of a spin S=1/2
antiferromagnetic two-leg ladder in the presence of period two lattice units
modulated, Dzyaloshinskii-Mor... | cond-mat_str-el |
Low-dimensional quantum magnetism in Cu(NCS)$_2$: A molecular framework
material: Low-dimensional magnetic materials with spin-$\frac{1}{2}$ moments can host a
range of exotic magnetic phenomena due to the intrinsic importance of quantum
fluctuations to their behavior. Here, we report the structure, magnetic
structur... | cond-mat_str-el |
Comment on ``Exact bosonization for an interacting Fermi gas in
arbitrary dimensions'': This a comment on arXiv:0907.3243v2. We demonstrate that the method proposed
by Efetov {\it et. al.} is just a reformulation of the Blankenbeckler,
Scalapino, and Sugar approach and thus it contains exactly the same sign
problem, ... | cond-mat_str-el |
Analysis of the Knight shift data on Li and Zn substituted YBCO: The Knight shift data on Li and Zn substituted YBa$_2$Cu$_3$O$_{6+x}$ are
analysed using an itinerant model with short-range antiferromagnetic
correlations. The model parameters, which are determined by fitting the
experimental data on the transverse nucl... | cond-mat_str-el |
Spin and charge density waves in the Lieb lattice: We study the mean-field phase diagram of the two-dimensional (2D) Hubbard
model in the Lieb lattice allowing for spin and charge density waves. Previous
studies of this diagram have shown that the mean-field magnetization
surprisingly deviates from the value predicted ... | cond-mat_str-el |
Quantum criticality and non-Fermi-liquid behavior in a two-level
two-lead quantum dot: Analytical and continuous-time quantum Monte Carlo methods are used to
investigate the possibility of occupation switching and quantum criticality in
a model of two quantum impurities coupled to two leads. A general discussion of
p... | cond-mat_str-el |
Spin Drag and Spin-Charge Separation in Cold Fermi Gases: Low-energy spin and charge excitations of one-dimensional interacting
fermions are completely decoupled and propagate with different velocities.
These modes however can decay due to several possible mechanisms. In this paper
we expose a new facet of spin-charge ... | cond-mat_str-el |
Relationship between ferroelectricity and Dzyaloshinskii-Moriya
interaction in multiferroics and the effect of bond-bending: We studied the microscopic mechanism of multiferroics, in particular with the
"spin current" model (Hosho Katsura, Naoto Nagaosa and Aleander V. Balatsky,
Phys. Rev. Lett. 95, 057205 (2005)). S... | cond-mat_str-el |
Quasiparticle lifetime behaviour in a simplified self-consistent
T-matrix treatment of the attractive Hubbard model in 2D: The attractive Hubbard model on a 2-D square lattice is studied at low
electronic densities using the ladder approximation for the pair
susceptibility. This model includes (i) the short coherence... | cond-mat_str-el |
Spin-Wave and Electromagnon Dispersions in Multiferroic MnWO4 as
Observed by Neutron Spectroscopy: Isotropic Heisenberg Exchange versus
Anisotropic Dzyaloshinskii-Moriya Interaction: High resolution inelastic neutron scattering reveals that the elementary
magnetic excitations in multiferroic MnWO4 consist of low en... | cond-mat_str-el |
Polaronic signatures in the optical properties of
Nd$_{2-x}$Ce$_x$CuO$_4$: We investigate the temperature and doping dependence of the optical
conductivity $\sigma(\omega)$ of Nd$_{2-x}$Ce$_x$CuO$_4$ in terms of
magnetic/lattice polaron formation. We employ dynamical mean-field theory in
the context of the Holstein-t... | cond-mat_str-el |
Symmetry-protected topological phases of alkaline-earth cold fermionic
atoms in one dimension: We investigate the existence of symmetry-protected topological phases in
one-dimensional alkaline-earth cold fermionic atoms with general half-integer
nuclear spin I at half filling. In this respect, some orbital degrees of... | cond-mat_str-el |
On the stability of topological order in tensor network states: We construct a tensor network representation of the 3d toric code ground
state that is stable to a generating set of uniform local tensor perturbations,
including those that do not map to local operators on the physical Hilbert
space. The stability is esta... | cond-mat_str-el |
Extended DFT+U+V method with on-site and inter-site electronic
interactions: In this article we introduce a generalization of the popular DFT+U method
based on the extended Hubbard model that includes on-site and inter-site
electronic interactions. The novel corrective Hamiltonian is designed to study
systems for whi... | cond-mat_str-el |
Possible interaction driven topological phases in (111) bilayers of
LaNiO3: We use the variational mean-field approach to systematically study the phase
diagram of a bilayer heterostructure of the correlated transition metal oxide
LaNiO3, grown along the (111) direction. The Ni 3+ ions with d7 (or eg1)
configuration ... | cond-mat_str-el |
Nine classes of integrable boundary conditions for the eight-state
supersymmetric fermion model: Nine classes of integrable boundary conditions for the eight-state
supersymmetric model of strongly correlated fermions are presented. The
boundary systems are solved by using the coordinate Bethe ansatz method and the
Be... | cond-mat_str-el |
Extension of the spin-1/2 frustrated square lattice model: the case of
layered vanadium phosphates: We study the influence of the spin lattice distortion on the properties of
frustrated magnetic systems and consider the applicability of the spin-1/2
frustrated square lattice model to materials lacking tetragonal symm... | cond-mat_str-el |
Effects of quantum impurity spins on the magnetic properties of zigzag
and linear spin chains: We investigated the magnetic ground state and low-energy excitations of the
spin chains compounds SrCuO$_{2}$ (zigzag chains) and Sr$_{2}$CuO$_{3}$ (linear
chains) in the presence of quantum impurities induced by lightly do... | cond-mat_str-el |
Unraveling Orbital Correlations via Magnetic Resonant Inelastic X-ray
Scattering: Although orbital degrees of freedom are a factor of fundamental importance in
strongly correlated transition metal compounds, orbital correlations and
dynamics remain very difficult to access, in particular by neutron scattering.
Via a ... | cond-mat_str-el |
Emergent SU(3) symmetry in random spin-1 chains: We show that generic SU(2)-invariant random spin-1 chains have phases with an
emergent SU(3) symmetry. We map out the full zero-temperature phase diagram and
identify two different phases: (i) a conventional random singlet phase (RSP) of
strongly bound spin pairs (SU(3) ... | cond-mat_str-el |
Comment on "Critical spin dynamics of the 2D quantum Heisenberg
antiferromagnets: Sr2CuO2Cl2 and Sr2Cu3O4Cl2": We compare the neutron measurements of Kim et al. (cond-mat/0012239) on
two-dimensional, S=1/2 antiferromagnets with the continuum quasiclassical
theory of S. Sachdev and O.A. Starykh (cond-mat/9904354). The... | cond-mat_str-el |
Energy band of graphene ribbons under the tensile force: According to the tight-binding approximation, we investigate the electronic
structures of graphene ribbons with zigzag shaped edges (ZGRs) and armchair
shaped edges (AGRs) drawn by the tensile force, and obtain the analytic
relations between the energy bands of p... | cond-mat_str-el |
Dimensionality Control of d-orbital Occupation in Oxide Superlattices: Manipulating the orbital state in a strongly correlated electron system is of
fundamental and technological importance for exploring and developing novel
electronic phases. Here, we report an unambiguous demonstration of orbital
occupancy control be... | cond-mat_str-el |
Pseudofermion ferromagnetism in the Kondo lattices: a mean-field
approach: Ground state ferromagnetism of the Kondo lattices is investigated within
slave fermion approach by Coleman and Andrei within a mean-field approximation
in the effective hybridization model. Conditions for formation of both
saturated (half-meta... | cond-mat_str-el |
Ferromagnetism and Fermi-surface transition in the periodic Anderson
model: Second-order phase transition without symmetry breaking: We study ferromagnetism in the periodic Anderson model with and without a
magnetic field by the Gutzwiller theory. We find three ferromagnetic phases: a
weak ferromagnetic phase (FM0), ... | cond-mat_str-el |
Steady-state superconductivity in electronic materials with repulsive
interactions: We study the effect of laser driving on a minimal model for a hexagonal
two-dimensional material with broken inversion symmetry. Through the
application of circularly polarised light and coupling to a thermal free
electron bath, the s... | cond-mat_str-el |
Correlation-driven electronic nematicity in the Dirac semimetal BaNiS2: In BaNiS2 a Dirac nodal-line band structure exists within a two-dimensional
Ni square lattice system, in which significant electronic correlation effects
are anticipated. Using scanning tunneling microscopy, we discover signs of
correlated-electron... | cond-mat_str-el |
Quantum chaos on a critical Fermi surface: We compute parameters characterizing many-body quantum chaos for a critical
Fermi surface without quasiparticle excitations. We examine a theory of $N$
species of fermions at non-zero density coupled to a $U(1)$ gauge field in two
spatial dimensions, and determine the Lyapunov... | cond-mat_str-el |
Magnetic critical properties and basal-plane anisotropy of Sr$_2$IrO$_4$: The anisotropic magnetic properties of Sr$_2$IrO$_4$ are investigated, using
longitudinal and torque magnetometry. The critical scaling across $T_c$ of the
longitudinal magnetization is the one expected for the 2D XY universality
class. Modeling ... | cond-mat_str-el |
Angular dependence of the Hall effect of lsmo films: We find that the Hall effect resistivity ($\rho_{xy}$) of thin films of
\lsmo\ varies as a function of the angle $\theta$ between the applied magnetic
field and the film normal as $\rho_{xy}=a\cos \theta + b\cos 3\theta$, where
$|b|$ increases with increasing tempera... | cond-mat_str-el |
Spin Density and Non-Collinear Magnetization in Frustrated Pyrochlore
\tbti from Polarized Neutron Scattering: We used a local susceptibility approach in extensive polarized neutron
diffraction studies of the spin liquid \tbti. For a magnetic field applied
along the [110] and [111] directions, we found that, at high ... | cond-mat_str-el |
Microscopic characterization of the magnetic properties of the itinerant
antiferromagnet La2Ni7 by 139La NMR/NQR measurements: 139La nuclear magnetic resonance (NMR) and nuclear quadrupole resonance (NQR)
measurements have been performed to investigate the magnetic properties of the
itinerant magnet La2Ni7 which show... | cond-mat_str-el |
Metamagnetic transition in the two $f$ orbitals Kondo lattice model: In this work, we study the effects of a transverse magnetic field in a Kondo
lattice model with two $f$ orbitals interacting with the conduction electrons.
The $f$ electrons that are present on the same site interact through Hund's
coupling, while on ... | cond-mat_str-el |
Renormalization Group Potential for Quasi-One-Dimensional Correlated
Systems: We studied the correlated quasi-one-dimensional systems by one-loop
renormalization group techniques in weak coupling. In contrast to conventional
g-ology approach, we formulate the theory in terms of bilinear currents and
obtain all possib... | cond-mat_str-el |
Zero frequency divergence and gauge phase factor in the optical response
theory: The static current-current correlation leads to the definitional zero
frequency divergence (ZFD) in the optical susceptibilities. Previous
computations have shown nonequivalent results between two gauges (${\bf p\cdot
A}$ and ${\bf E \cd... | cond-mat_str-el |
Majorana Edge States for Z2 Topological Orders of the Wen-plaquette
Model and the Toric-code Model: In this paper we study the symmetry protected Majorana edge states for the Z2
topological order of the Wen-plaquette model and the toric-code model and
calculate the dispersion of the Majorana edge states. For the syst... | cond-mat_str-el |
Reply to 'Comment on "Dynamic correlations of the spinless Coulomb
Luttinger liquid [Phys. Rev. B 65, 125109 (2002)]"': We show that the criticism of our paper [Phys. Rev. B 65, 125109 (2002)] by
Wang, Millis, and Das Sarma [cond-mat/0206203] is based on a trivial
mathematical mistake they have committed. | cond-mat_str-el |
Symmetry projected Jastrow mean field wavefunction in variational Monte
Carlo: We extend our low-scaling variational Monte Carlo (VMC) algorithm to optimize
the symmetry projected Jastrow mean field (SJMF) wavefunctions. These
wavefunctions consist of a symmetry-projected product of a Jastrow and a
general broken-sym... | cond-mat_str-el |
Matrix-product-state method with a dynamical local basis optimization
for bosonic systems out of equilibrium: We present a method for simulating the time evolution of one-dimensional
correlated electron-phonon systems which combines the time-evolving block
decimation algorithm with a dynamical optimization of the loc... | cond-mat_str-el |
Floquet second-order topological insulators in non-Hermitian systems: Second-order topological insulator (SOTI) is featured with the presence of
$(d-2)$-dimensional boundary states in $d$-dimension systems. The
non-Hermiticity induced breakdown of bulk-boundary correspondence (BBC) and the
periodic driving on systems g... | cond-mat_str-el |
Stability of skyrmions in perturbed ferromagnetic chiral magnets: Magnetic skyrmions, topological spin textures observed in chiral magnets,
have attracted huge interest due to their applications in the field of
spintronics. In this work we study the stability of circular isolated skyrmions
in ferromagnetic chiral magne... | cond-mat_str-el |
Floquet multi-Weyl points in crossing-nodal-line semimetals: Weyl points with monopole charge $\pm 1$ have been extensively studied,
however, real materials of multi-Weyl points, whose monopole charges are higher
than $1$, have yet to be found. In this Rapid Communication, we show that
nodal-line semimetals with nontri... | cond-mat_str-el |
The possibility of measuring intrinsic electronic correlations in
graphene using a d-wave contact Josephson junction: While not widely recognized, electronic correlations might play an important
role in graphene. Indeed, Pauling's resonance valence bond (RVB) theory for the
pp-bonded planar organic molecules, of whic... | cond-mat_str-el |
Bending and Breaking of Stripes in a Charge-Ordered Manganite: In complex electronic materials, coupling between electrons and the atomic
lattice gives rise to remarkable phenomena, including colossal
magnetoresistance and metal-insulator transitions. Charge-ordered phases are a
prototypical manifestation of charge-lat... | 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 effects in partially ionized mass asymmetric electron-hole
plasmas: The effects of strong Coulomb correlations in dense three-dimensional
electron-hole plasmas are studied by means of unbiased direct path integral
Monte Carlo simulations. The formation and dissociation of bound states, such
as excitons an... | cond-mat_str-el |
The ALPS project release 1.3: open source software for strongly
correlated systems: We present release 1.3 of the ALPS (Algorithms and Libraries for Physics
Simulations) project, an international open source software project to develop
libraries and application programs for the simulation of strongly correlated
quant... | cond-mat_str-el |
Magnetic excitations in hole-doped Sr2IrO4: A comparison with
electron-doped cuprates: We have studied the evolution of magnetic and orbital excitations as a
function of hole-doping in single crystal samples of Sr2Ir(1-x)Rh(x)O4 (0.07 <
x < 0.42) using high resolution Ir L3-edge resonant inelastic x-ray scattering
(R... | cond-mat_str-el |
The Thermoelectric Effect and Its Natural Heavy Fermion Explanation in
Twisted Bilayer and Trilayer Graphene: We study the interacting transport properties of twisted bilayer graphene
(TBG) using the topological heavy-fermion (THF) model. In the THF model, TBG
comprises localized, correlated $f$-electrons and itinera... | cond-mat_str-el |
Emergent soft-gap Anderson models at quantum criticality in a lattice
Hamiltonian within dynamical mean field theory: Local quantum criticality in itinerant fermion systems has been extensively
investigated through the soft-gap Anderson impurity model, wherein a localized,
correlated impurity, hybridizes with a broad... | cond-mat_str-el |
Calculating ground state properties of correlated fermionic systems with
BCS trial wave functions in Slater determinant path-integral approaches: We introduce an efficient and numerically stable technique to make use of a
BCS trial wave function in the computation of correlation functions of strongly
correlated quant... | cond-mat_str-el |
Demonstration of a robust pseudogap in a three-dimensional correlated
electronic system: We outline a partial-fractions decomposition method for determining the
one-particle spectral function and single-particle density of states of a
correlated electronic system on a finite lattice in the non self-consistent
T-matri... | cond-mat_str-el |
Fermi surface reconstruction by a charge-density-wave with finite
correlation length: Even a small amplitude charge-density-wave (CDW) can reconstruct a Fermi
surface, giving rise to new quantum oscillation frequencies. Here, we
investigate quantum oscillations when the CDW has a finite correlation length
$\xi$ -- a ... | cond-mat_str-el |
A look at the crossover region between BCS superconductivity and Bose
Einstein Condensation: Pair fluctuation theory has been used to study the crossover from the weak
coupling BCS theory to the strong coupling Bose Einstein Condensation. The
effect of fluctuations has been studied over the whole crossover regime. It... | cond-mat_str-el |
Magnetic field dependence of the many-electron states in a magnetic
quantum dot: The ferromagnetic-antiferromagnetic transition: The electron-electron correlations in a many-electron (Ne = 1, 2,..., 5)
quantum dot confined by a parabolic potential is investigated in the presence
of a single magnetic ion and a perpend... | cond-mat_str-el |
Thermodynamic investigations in the precursor region of FeGe: High-resolution DC magnetization and AC-specific heat data of the cubic
helimagnet FeGe have been measured as function of temperature and magnetic
field. The magnetization data as well as the isothermal susceptibility data
confirm the complexity of the magne... | cond-mat_str-el |
Formation of energy gap in higher dimensional spin-orbital liquids: A Schwinger boson mean field theory is developed for spin liquids in a
symmetric spin-orbital model in higher dimensions. Spin, orbital and coupled
spin-orbital operators are treated equally. We evaluate the dynamic correlation
functions and collective... | cond-mat_str-el |
Emergent Anisotropic Non-Fermi Liquid at a Topological Phase Transition
in Three Dimensions: Understanding correlation effects in topological phases and their transitions
is a cutting-edge area of research in recent condensed matter physics. We study
topological quantum phase transitions (TQPTs) between double-Weyl s... | cond-mat_str-el |
Dynamical Effects from Anomaly: Modified Electrodynamics in Weyl
Semimetal: We discuss the modified quantum electrodynamics from a time-reversal-breaking
Weyl semimetal coupled with a $U(1)$ gauge (electromagnetic) field. A key role
is played by the soft dispersion of the photons in a particular direction, say
$\hat{... | cond-mat_str-el |
Model for the Magnetic Order and Pairing Channels in Fe Pnictide
Superconductors: A two-orbital model for Fe-pnictide superconductors is investigated using
computational techniques on two-dimensional square clusters. The hopping
amplitudes are derived from orbital overlap integrals, or by band structure
fits, and the... | cond-mat_str-el |
Light-induced magnetization driven by interorbital charge motion in a
spin-orbit assisted Mott insulator alpha-RuCl3: In a honeycomb-lattice spin-orbit assisted Mott insulator {\alpha}-RuCl3, an
ultrafast magnetization is induced by circularly polarized excitation below the
Mott gap. Photo-carriers play an important ... | cond-mat_str-el |
Wigner-molecule supercrystal in transition-metal dichalcogenide moiré
superlattices: Lessons from the bottom-up approach: The few-body problem for $N=4$ fermionic charge carriers in a double-well
moir\'{e} quantum dot (MQD), representing the first step in a bottom-up
strategy to investigate formation of molecular sup... | cond-mat_str-el |
Excitation Spectra and Thermodynamic Response of Segmented Heisenberg
Spin Chains: The spectral and thermodynamic response of segmented quantum spin chains is
analyzed using a combination of numerical techniques and finite-size scaling
arguments. Various distributions of segment lengths are considered, including
the ... | cond-mat_str-el |
Itinerant Quantum Critical Point with Fermion Pockets and Hot Spots: Metallic quantum criticality is among the central theme in the understanding
of correlated electronic systems, and converging results between analytical and
numerical approaches are still under calling. In this work, we develop
state-of-art large scal... | cond-mat_str-el |
First-order melting of a weak spin-orbit Mott insulator into a
correlated metal: The electronic phase diagram of the weak spin-orbit Mott insulator
(Sr(1-x)Lax)3Ir2O7 is determined via an exhaustive experimental study. Upon
doping electrons via La substitution, an immediate collapse in resistivity
occurs along with a... | cond-mat_str-el |
Local Potential Functional Embedding Theory: A Self-Consistent Flavor of
Density Functional Theory for Lattices without Density Functionals: The recently proposed Householder transformed density-matrix functional
embedding theory (Ht-DMFET) [Sekaran et al., Phys. Rev. B 104, 035121 (2021)],
which is equivalent to (bu... | cond-mat_str-el |
Detection of long-range entanglement in gapped quantum spin liquids by
local measurements: Topological order, reflected in long range patterns of entanglement, is
quantified by the topological entanglement entropy (TEE) $\gamma$. We show that
for gapped quantum spin liquids (QSL) it is possible to extract $\gamma$ us... | cond-mat_str-el |
Ring Exchange Mechanism for Triplet Superconductivity in a Two-Chain
Hubbard Model: Possible Relevance to Bechgaard Salts: The density-matrix renormalization group method is used to study the ground
state of the two-chain zigzag-bond Hubbard model at quarter filling. We show
that, with a proper choice of the signs of... | cond-mat_str-el |
Geometrical quadrupolar frustration in DyB$_4$: Physical properties of DyB$_4$ have been studied by magnetization, specific
heat, and ultrasonic measurements. The magnetic entropy change and the
ultrasonic properties in the intermediate phase II indicate that the degeneracy
of internal degrees of freedom is not fully l... | cond-mat_str-el |
Signatures of a topological Weyl loop in Co$_3$Sn$_2$S$_2$: The search for novel topological phases of matter in quantum magnets has
emerged as a frontier of condensed matter physics. Here we use state-of-the-art
angle-resolved photoemission spectroscopy (ARPES) to investigate single
crystals of Co$_3$Sn$_2$S$_2$ in it... | cond-mat_str-el |
Asymptotic Freedom and Large Spin Antiferromagnetic Chains: Building on the mapping of large-$S$ spin chains onto the O($3$) nonlinear
$\sigma$ model with coupling constant $2/S$, and on general properties of that
model (asymptotic freedom, implying that perturbation theory is valid at high
energy, and Elitzur's conjec... | cond-mat_str-el |
Imaginary part of Hall conductivity in tilted doped Weyl semimetal with
both broken time reversal and inversion symmetry: We consider a Weyl semimetal (WSM) with finite doping and tilt within a
continuum model Hamiltonian with both broken time reversal and inversion
symmetry. We calculate the absorptive part of the a... | cond-mat_str-el |
Orbital Polarization in Strained LaNiO$_{3}$: Structural Distortions and
Correlation Effects: Transition-metal heterostructures offer the fascinating possibility of
controlling orbital degrees of freedom via strain. Here, we investigate
theoretically the degree of orbital polarization that can be induced by
epitaxial... | cond-mat_str-el |
Comment on "Origin of Giant Optical Nonlinearity in
Charge-Transfer--Mott Insulators: A New Paradigm for Nonlinear Optics": Comment on Phys. Rev. Lett. 86, 2086 (2001) | cond-mat_str-el |
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