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Ineffectiveness of the Dzyaloshinskii-Moriya interaction in the
dynamical quantum phase transition in the ITF model: Quantum phase transition occurs at a quantum critical value of a control
parameter such as the magnetic field in the Ising model in a transverse
magnetic field (ITF). Recently, it is shown that ramping... | cond-mat_str-el |
Strong correlation induced charge localization in antiferromagnets: The fate of an injected hole in a Mott antiferromagnet is an outstanding
issue of strongly correlated physics. It provides important insights into doped
Mott insulators closely related to high-temperature superconductivity in
cuprates. Here, we report ... | cond-mat_str-el |
Hartree-Fock study of the moiré Hubbard model for twisted bilayer
transition metal dichalcogenides: Twisted bilayer transition metal dichalcogenides have emerged as important
model systems for the investigation of correlated electron physics because
their interaction strength, carrier concentration, band structure, a... | cond-mat_str-el |
Vortex creation and control in the Kitaev spin liquid by local bond
modulations: The Kitaev model realizes a quantum spin liquid where the spin excitations
are fractionalized into itinerant Majorana fermions and localized
$\mathbb{Z}_2$ vortices. Quantum entanglement between the fractional
excitations can be utilized... | cond-mat_str-el |
Reply to Comment on "Magnetotransport signatures of a single nodal
electron pocket constructed from Fermi arcs": In a recent manuscript, we showed how an electron pocket in the shape of a
diamond with concave sides could potentially explain changes in sign of the
Hall coefficient R_H in the underdoped high-Tc cuprate... | cond-mat_str-el |
Supersymmetric Approach to Heavy-Fermion Systems: We present a new supersymmetric approach to the Kondo lattice model in order
to describe simultaneously the quasiparticle excitations and the low-energy
magnetic fluctuations in heavy-Fermion systems. This approach mixes the
fermionic and the bosonic representation of t... | cond-mat_str-el |
Electrically controllable magnetic order in the bilayer Hubbard model on
honeycomb lattice --- a determinant quantum Monte Carlo study: Layered antiferromagnetic spin density wave (LAF) state is one of the
plausible ground states of charge neutral Bernal stacked bilayer graphene. In
this paper, we use determinant qua... | cond-mat_str-el |
Thermal stability and irreversibility of skyrmion-lattice phases in
Cu$_2$OSeO$_3$: Small angle neutron scattering measurements have been performed to study the
thermodynamic stability of skyrmion-lattice phases in Cu$_2$OSeO$_3$. We found
that the two distinct skyrmion-lattice phases [SkX(1) and SkX(2) phases] can b... | cond-mat_str-el |
Disorder effects in spiral spin liquids: Long-range spin textures,
Friedel-like oscillations, and spiral spin glasses: Spiral spin liquids are correlated states of matter in which a frustrated
magnetic system evades order by fluctuating between a set of (nearly)
degenerate spin spirals. Here, we investigate the respo... | cond-mat_str-el |
The Composite Particle-Hole Spinor of the Lowest Landau Level: We propose to form a two-component effective field theory from L = (L_ce +
L_ch)/2, where L_ce is the Lagrangian of composite electrons with a
Chern-Simons term, and L_ch is the particle-hole conjugate of L_ce - the
Lagrangian of composite holes. In the the... | cond-mat_str-el |
Phase transitions in chiral magnets from Monte Carlo simulations: Motivated by the unusual temperature dependence of the specific heat in MnSi,
comprising a combination of a sharp first-order feature accompanied by a broad
hump, we study the extended Heisenberg model with competing exchange $J$ and
anisotropic Dzyalosh... | cond-mat_str-el |
Magnetic structure determination of Ca$_3$LiOsO$_6$ using neutron and
x-ray scattering: We present a neutron and x-ray scattering investigation of Ca$_3$LiOsO$_6$, a
material predicted to host magnetic ordering solely through an extended
superexchange pathway involving two anions, an interaction mechanism that has
un... | cond-mat_str-el |
Spin polarons in the t-J model in an unconstrained representation: The report discusses the slave-fermion representations of the t-J model and
describes another representation, in which fermions and bosons are completely
commuting and in which the properties of fermions are directly related to the
properties of physica... | cond-mat_str-el |
DMRG Approach to Optimizing Two-Dimensional Tensor Networks: Tensor network algorithms have been remarkably successful solving a variety
of problems in quantum many-body physics. However, algorithms to optimize
two-dimensional tensor networks known as PEPS lack many of the aspects that
make the seminal density matrix r... | cond-mat_str-el |
Results on the symmetries of integrable fermionic models on chains: We investigate integrable fermionic models within the scheme of the graded
Quantum Inverse Scattering Method, and prove that any symmetry imposed on the
solution of the Yang-Baxter Equation reflects on the constants of motion of the
model; generalizati... | cond-mat_str-el |
Multiple supersonic phase fronts launched at a complex-oxide
hetero-interface: Selective optical excitation of a substrate lattice can drive phase changes
across hetero-interfaces. This phenomenon is a non-equilibrium analogue of
static strain control in heterostructures and may lead to new applications in
optically ... | cond-mat_str-el |
Monte Carlo modeling the phase diagram of magnets with the
Dzyaloshinskii - Moriya interaction: We use classical Monte Carlo calculations to model the high-pressure behavior
of the phase transition in the helical magnets. We vary values of the exchange
interaction constant J and the Dzyaloshinskii-Moriya interaction ... | cond-mat_str-el |
Fermionic Monte Carlo study of a realistic model of twisted bilayer
graphene: The rich phenomenology of twisted bilayer graphene (TBG) near the magic angle
is believed to arise from electron correlations in topological flat bands. An
unbiased approach to this problem is highly desirable, but also particularly
challen... | cond-mat_str-el |
Inelastic neutron scattering studies of the quantum frustrated magnet
clinoatacamite, $γ$-Cu2(OD)3Cl, a proposed valence bond solid (VBS): The frustrated magnet clinoatacamite, $\gamma$-Cu$_2$(OH)$_3$Cl, is
attracting a lot of interest after suggestions that at low temperature it forms
an exotic quantum state termed ... | cond-mat_str-el |
Modified kagome physics in the natural spin-1/2 kagome lattice systems -
kapellasite Cu3Zn(OH)6Cl2 and haydeeite Cu3Mg(OH)6Cl2: The recently discovered natural minerals Cu3Zn(OH)6Cl2 and Cu3Mg(OH)6Cl2 are
spin 1/2 systems with an ideal kagome geometry. Based on electronic structure
calculations, we develop a realisti... | cond-mat_str-el |
Freezing out of a low-energy bulk spin exciton in SmB6: The Kondo insulator SmB6 is purported to develop into a robust topological
insulator at low temperature. Yet there are several puzzling and unexplained
physical properties of the insulating bulk. It has been proposed that bulk spin
excitons may be the source of th... | cond-mat_str-el |
Rigorous Wilsonian Renormalization Group for impurity models with a
spectral gap: The Anderson impurity model (AIM) has long served as a cornerstone in the
study of correlated electron systems. While numerical renormalization group
(RG) offers great flexibility for metallic reservoirs, it becomes impossible in
an unb... | cond-mat_str-el |
Quantization of fractional corner charge in $C_n$-symmetric higher-order
topological crystalline insulators: In the presence of crystalline symmetries, certain topological insulators
present a filling anomaly: a mismatch between the number of electrons in an
energy band and the number of electrons required for charge... | cond-mat_str-el |
Unconventional density wave in CeCoIn_5?: Very recently large Nernst effect and Seebeck effect were observed above the
superconducting transition temperature 2.3K in a heavy fermion superconductor
CeCoIn_5. We shall interpret this large Nernst effect in terms of
unconventional density wave (UDW), which appears around T... | cond-mat_str-el |
Magnetic-Field-Independent Ultrasonic Dispersions in the Magnetically
Robust Heavy Fermion System SmOs4Sb12: Elastic properties of the filled skutterudite compound SmOs$_4$Sb$_{12}$ have
been investigated by ultrasonic measurements. The elastic constant
$C_{11}(\omega)$ shows two ultrasonic dispersions at $\sim$15 K ... | cond-mat_str-el |
Dynamical spin susceptibility in La2CuO4 studied by resonant inelastic
x-ray scattering: Resonant inelastic X-ray scattering (RIXS) is a powerful probe of elementary
excitations in solids. It is now widely applied to study magnetic excitations.
However, its complex cross-section means that RIXS has been more difficul... | cond-mat_str-el |
Contiguous 3d and 4f magnetism: towards strongly correlated 3d electrons
in YbFe2Al10: We present magnetization, specific heat, and 27Al NMR investigations on
YbFe2Al10 over a wide range in temperature and magnetic field. The magnetic
susceptibility at low temperatures is strongly enhanced at weak magnetic
fields, ac... | cond-mat_str-el |
Dynamics of a bond-disordered $S=1$ quantum magnet near $z=1$
criticality: Neutron scattering is used to study
NiCl$_{2-2x}$Br$_{2x}\cdot$4SC(NH$_2$)$_2$, $x=0.06$, a bond-disordered
modification of the well-known gapped $S=1$ antiferromagnetic quantum spin
system NiCl$_{2}\cdot$4SC(NH$_2$)$_2$. The magnetic excitati... | cond-mat_str-el |
Competing Correlated Insulators in multi-orbital systems coupled to
phonons: We study the interplay between electron-electron interaction and a
Jahn-Teller phonon coupling in a two-orbital Hubbard model. We demonstrate that
the e-ph interaction coexists with the Mott localization driven by the Hubbard
repulsion U, bu... | cond-mat_str-el |
Orbital Disordering and metal-insulator transition with hole-doping in
perovskite-type vanadium oxides: Filling-control metal-insulator transitions (MITs) and related electronic
phase diagrams have been investigated for hole-doped vanadium oxides,
Pr_{1-x}Ca_xVO_3, Nd_{1-x}Sr_xVO_3 and Y_{1-x}Ca_xVO_3, with perovskit... | cond-mat_str-el |
Quantum criticality and the formation of a putative electronic liquid
crystal in Sr3Ru2O7: We present a brief review of the physical properties of Sr3Ru2O7, in which
the approach to a magnetic-field-tuned quantum critical point is cut off by the
formation of a novel phase with transport characteristics consistent wit... | cond-mat_str-el |
Gapless edges of 2d topological orders and enriched monoidal categories: In this work, we give a precise mathematical description of a fully chiral
gapless edge of a 2d topological order (without symmetry). We show that the
observables on the 1+1D world sheet of such an edge consist of a family of
topological edge exci... | cond-mat_str-el |
An anomalous butterfly-shaped magnetoresistance loop in an alloy,
Tb4LuSi3: Magnetic-field (H) induced first-order magnetic transition and the assiciated
electronic phase-separation phenomena are active topics of research in
magnetism. Magnetoresistance (MR) is a key property to probe these phenomena
and, in literatu... | cond-mat_str-el |
Spin-fluctuation mechanism of superconductivity in cuprates: The theory of superconductivity within the t-J model, as relevant for
cuprates, is developed. It is based on the equations of motion for projected
fermionic operators and the mode-coupling approximation for the self-energy
matrix. The dynamical spin susceptib... | cond-mat_str-el |
Quantum and thermal effects in the double exchange ferromagnet: The physics of the ferromagnetic phase of the ``double exchange'' model has
been widely discussed in the context of the CMR manganites. Usually, the double
exchange ferromagnet is treated is classically, by mapping it onto an effective
Heisenberg model. Ho... | cond-mat_str-el |
Interacting Anisotropic Dirac Fermions in Strained Graphene and Related
Systems: We study the role of long-range electron-electron interactions in a system of
two-dimensional anisotropic Dirac fermions, which naturally appear in
uniaxially strained graphene, graphene in external potentials, some strongly
anisotropic ... | cond-mat_str-el |
Elastic Properties and Magnetic Phase Diagrams of Dense Kondo Compound
Ce0.75La0.25B6: We have investigated the elastic properties of the cubic dense Kondo compound
Ce0.75La0.25B6 by means of ultrasonic measurements. We have obtained magnetic
fields vs temperatures (H-T) phase diagrams under magnetic fields along the... | cond-mat_str-el |
Magnetism and fine electronic structure of UPd2Al3 and NpPd2Al3: We claim the existence of the f3 (U3+) configuration in UPd2Al3. It is in
agreement with inelastic-neutron-scattering (INS) excitations and is consistent
with the trivalent neptunium configuration in NpPd2Al3. We have derived set of
CEF parameters for the... | cond-mat_str-el |
Temperature-dependent $f$-electron evolution in CeCoIn$_5$ via a
comparative infrared study with LaCoIn$_5$: We investigated CeCoIn$_5$ and LaCoIn$_5$ single crystals, which have the
same HoCoGa$_5$-type tetragonal crystal structure, using infrared spectroscopy.
However, while CeCoIn$_5$ has 4$f$ electrons, LaCoIn$_5... | cond-mat_str-el |
Vortices in the presence of a nonmagnetic atom impurity in 2D XY
ferromagnets: Using a model of nonmagnetic impurity potential, we have examined the
behavior of planar vortex solutions in the classical two-dimensional XY
ferromagnets in the presence of a spin vacancy localized out of the vortex
core. Our results show... | cond-mat_str-el |
Antiferromagnetic spin-1/2 chains in (NO)Cu(NO3)3: a microscopic study: We report on the microscopic model of the recently synthesized
one-dimensional quantum magnet (NO)Cu(NO3)3. Applying density functional theory
band structure calculations, we obtain a leading antiferromagnetic exchange
coupling J ~ 200 K, which run... | cond-mat_str-el |
Anisotropic pseudogap in the half-filling 2-d Hubbard model at finite T: We have studied the pseudogap formation in the single-particle spectra of the
half-filling two-dimensional Hubbard model. Using a Green's function with the
one-loop self-energy correction of the spin and charge fluctuations, we have
numerically ca... | cond-mat_str-el |
Fermionic superfluidity: From high Tc superconductors to ultracold Fermi
gases: We present a pairing fluctuation theory which self-consistently incorporates
finite momentum pair excitations in the context of BCS--Bose-Einstein
condensation (BEC) crossover, and we apply this theory to high $T_c$
superconductors and ul... | cond-mat_str-el |
Renormalized perturbation calculations for the single impurity Anderson
model: We illustrate the renormalized perturbation expansion method by applying it
to a single impurity Anderson model. Previously, we have shown that this
approach gives the {\it exact} leading order results for the specific heat,
spin and charg... | cond-mat_str-el |
Phonon-induced disorder in dynamics of optically pumped metals from
non-linear electron-phonon coupling: The non-equilibrium dynamics of matter excited by light may produce
electronic phases that do not exist in equilibrium, such as laser-induced
high-transition-temperature superconductivity. Here we simulate the dyn... | cond-mat_str-el |
Complex pressure-temperature structural phase diagram of honeycomb
iridate Cu$_2$IrO$_3$: $\mathrm{Cu_2IrO_3}$ is among the newest layered honeycomb iridates and a
promising candidate to harbor a Kitaev quantum spin liquid state. Here, we
investigate the pressure and temperature dependence of its structure through a
... | cond-mat_str-el |
Magnetic transition and spin fluctuations in the unconventional
antiferromagnetic compound Yb3Pt4: Muon spin rotation and relaxation measurements have been carried out on the
unconventional antiferromagnet Yb_3Pt_4. Oscillations are observed below T_N =
2.22(1) K, consistent with the antiferromagnetic (AFM) Neel temp... | cond-mat_str-el |
Quantum kagome antiferromagnet: ZnCu3(OH)6Cl2: Herbertsmithite, ZnCu3(OH)6Cl2, is the prototype candidate for a spin liquid
behavior on a geometrically perfect kagome lattice. Its discovery and the
absence of any evidence for spin-freezing down to the lowest probed temperature
to-date enable one to explore the properti... | cond-mat_str-el |
Construction of Localized Basis for Dynamical Mean Field Theory: Many-body Hamiltonians obtained from first principles generally include all
possible non-local interactions. But in dynamical mean field theory the
non-local interactions are ignored, and only the effects of the local
interactions are taken into account. ... | cond-mat_str-el |
Structural and dynamical study of moment localization in
beta-Mn(1-x)In(x): We have used neutron scattering and muon spin relaxation (muSR) to
investigate the structural and magnetic properties of the beta-phase of
elemental manganese doped with dilute amounts of indium. beta-Mn is an example
of a topologically frust... | cond-mat_str-el |
Terahertz parametric amplification as a reporter of exciton condensate
dynamics: Condensates are a hallmark of emergence in quantum materials with
superconductors and charge density wave as prominent examples. An excitonic
insulator (EI) is an intriguing addition to this library, exhibiting
spontaneous condensation o... | cond-mat_str-el |
Scaling of THz-conductivity at metal-insulator transition in doped
manganites: Magnetic field and temperature dependence of the Terahertz conductivity and
permittivity of the colossal magnetoresistance manganite
Pr_{0.65}Ca_{0.28}Sr_{0.07}MnO_3 (PCSMO) is investigated approaching the
metal-to-insulator transition (MI... | cond-mat_str-el |
Ground-state selection and spin-liquid behaviour in the classical
Heisenberg model on the breathing pyrochlore lattice: Magnetic pyrochlore oxides, including the spin ice materials, have proved to
be a rich field for the study of geometrical frustration in 3 dimensions.
Recently, a new family of magnetic oxides has b... | cond-mat_str-el |
My Random Walks in Anderson's Garden: Anderson's Garden is a drawing presented to Philip W. Anderson on the eve of
his 60th birthday celebration, in 1983. This cartoon (Fig. 1), whose author is
unknown, succinctly depicts some of Anderson's pre-1983 works, as a blooming
garden. As an avid reader of Anderson's papers, r... | cond-mat_str-el |
Magnetic-field induced triplet superconductivity in the Hubbard model on
a triangular lattice: We propose theoretically that a magnetic field can realize spin-triplet
superconductivity in repulsively interacting electron systems having strong
ferromagnetic spin fluctuations. We confirm the general idea for the
low-de... | cond-mat_str-el |
Phonon Thermal Transport of URu2Si2: Broken Translational Symmetry and
Strong-Coupling of the Hidden Order to the Lattice: A dramatic increase in the total thermal conductivity (k) is observed in the
Hidden Order (HO) state of single crystal URu2Si2. Through measurements of the
thermal Hall conductivity, we explicitl... | cond-mat_str-el |
Charge Stripe in an Antiferromagnet: 1d Band of Composite Excitations: With the help of analytical and numerical studies of the $t$-$J_z$ model we
argue that the charge stripe in an antiferromagnetic insulator should be
understood as a system of holon-spin-polaron excitations condensed at the
self-induced antiphase dom... | cond-mat_str-el |
Josephson current through the SYK model: We calculate the equilibrium Josephson current through a disordered
interacting quantum dot described by a Sachdev-Ye-Kitaev model contacted by two
BCS superconductors. We show that, at zero temperature and at the conformal
limit, i.e. in the strong interacting limit, the Joseph... | cond-mat_str-el |
Lattice source for charge and spin inhomogeneity in 2D perovskite
cuprates: In the work we highlight the structural features of 2D perovskite cuprates
(tilted CuO$_6$ octahedra with different orientation with respect to spacer
rocksalt layers), where sources of charge and spin inhomogeneity can be hidden.
We used the... | cond-mat_str-el |
Connecting high-field quantum oscillations to zero-field electron
spectral functions in the underdoped cuprates: The central puzzle of the cuprate superconductors at low hole density is the
nature of the pseudogap regime. It has a number of seemingly distinct
experimental signatures: a suppression of the paramagnetic... | cond-mat_str-el |
Minimalist approach to the classification of symmetry protected
topological phases: A number of proposals with differing predictions (e.g. Borel group
cohomology, oriented cobordism, group supercohomology, spin cobordism, etc.)
have been made for the classification of symmetry protected topological (SPT)
phases. Here... | cond-mat_str-el |
Realistic Modeling of Complex Oxide Materials: Since electronic and magnetic properties of many transition-metal oxides can
be efficiently controlled by external factors such as the temperature,
pressure, electric or magnetic field, they are regarded as promising materials
for various applications. From the viewpoint o... | cond-mat_str-el |
Intrasubband and Intersubband Electron Relaxation in Semiconductor
Quantum Wire Structures: We calculate the intersubband and intrasubband many-body inelastic Coulomb
scattering rates due to electron-electron interaction in two-subband
semiconductor quantum wire structures. We analyze our relaxation rates in terms
of... | cond-mat_str-el |
Decoherence of charge density waves in beam splitters for interacting
quantum wires: Simple intersections between one-dimensional channels can act as coherent
beam splitters for non-interacting electrons. Here we examine how coherent
splitting at such intersections is affected by inter-particle interactions, in
the s... | cond-mat_str-el |
Influence of phonon-assisted tunneling on the linear thermoelectric
transport through molecular quantum dots: We investigate the effect of vibrational degrees of freedom on the linear
thermoelectric transport through a single-level quantum dot described by the
spinless Anderson-Holstein impurity model. To study the e... | cond-mat_str-el |
Muon spin rotation and neutron scattering study of the
non-centrosymmetric tetragonal compound CeAuAl3: We have investigated the non-centrosymmetric tetragonal heavy-fermion
compound CeAuAl3 using muon spin rotation (muSR), neutron diffraction (ND) and
inelastic neutron scattering (INS) measurements. We have also rev... | cond-mat_str-el |
Magnetic tunneling induced Weyl node annihilation in TaP: Weyl nodes are topological objects in three-dimensional metals. Their
topological property can be revealed by studying the high-field transport
properties of a Weyl semimetal. While the energy of the lowest Landau band
(LLB) of a conventional Fermi pocket always... | cond-mat_str-el |
NaCo2(SeO3)2(OH): Competing Magnetic Ground States of a New Sawtooth
Structure with 3d7 Co2+ Ions: While certain magnetic sublattices have long been known theoretically to give
rise to emergent physics via competing magnetic interactions and quantum
effects, finding such configurations in real materials is often deep... | cond-mat_str-el |
Van der Waals Schottky barriers as interface probes of the correlation
between chemical potential shifts and charge density wave formation in
1T-TiSe$_2$ and 2H-NbSe$_2$: Layered transition metal dichalcogenide (TMD) materials, i.e. 1T-TiSe$_2$ and
2H-NbSe$_2$, harbor a second order charge density wave (CDW) transi... | cond-mat_str-el |
Quantum renormalization of entanglement in an antisymmetric anisotropic
and bond-alternating spin system: The quantum renormalization group method is applied to study the quantum
criticality and entanglement entropy of the ground state of the Ising chain in
the presence of antisymmetric anisotropic couplings and alte... | cond-mat_str-el |
Photo-induced Tomonaga-Luttinger-like liquid in a Mott insulator: Photo-induced metallic states in a Mott insulator are studied for the
half-filled, one-dimensional Hubbard model with the time-dependent density
matrix renormalization group. An irradiation of strong AC field is found to
create a linear dispersion in the... | cond-mat_str-el |
Interaction-induced adiabatic cooling and antiferromagnetism of cold
fermions in optical lattices: We propose an interaction-induced cooling mechanism for two-component cold
fermions in an optical lattice. It is based on an increase of the ``spin''
entropy upon localisation, an analogue of the Pomeranchuk effect in l... | cond-mat_str-el |
Magnon-Hole Scattering and Charge Order in $Sr_{14-x}Ca_xCu_{24}O_{41}$: The magnon thermal conductivity $\kappa_{\mathrm{mag}}$ of the hole doped
spin ladders in $\rm Sr_{14-x}Ca_xCu_{24}O_{41}$ has been investigated at low
doping levels $x$. The analysis of $\kappa_{\mathrm{mag}}$ reveals a strong
doping and temperat... | cond-mat_str-el |
Negative local resistance caused by viscous electron backflow in
graphene: Graphene hosts a unique electron system in which electron-phonon scattering
is extremely weak but electron-electron collisions are sufficiently frequent to
provide local equilibrium above liquid nitrogen temperature. Under these
conditions, el... | cond-mat_str-el |
Scattering rate, transport and specific heat in a metal close to a
quantum critical point : emergence of a robust Fermi liquid picture ?: We calculate the low temperature one-particle scattering rate and the
specific heat in a weakly disordered metal close to a quantum critical point.
To lowest order in the fluctuati... | cond-mat_str-el |
Nonresonant B1g Raman scattering in the Hubbard model: The numerically exact solution for nonresonant B1g Raman scattering is
presented for the half-filled Hubbard model in infinite dimensions. This
solution illustrates the modifications of the Raman response (in a system tuned
through the quantum-critical point of a m... | cond-mat_str-el |
Spontaneous Magnetization of an Ideal Ferromagnet: Beyond Dyson's
Analysis: Using the low-energy effective field theory for magnons, we systematically
evaluate the partition function of the O(3) ferromagnet up to three loops.
Dyson, in his pioneering microscopic analysis of the Heisenberg model, showed
that the spin-... | cond-mat_str-el |
Systematic improvement of the Momentum Average approximation for the
Green's function of a Holstein polaron: We show how to systematically improve the Momentum Average (MA)approximation
for the Green's function of a Holstein polaron, bysystematically improving the
accuracy of the self-energy diagrams in such a way th... | cond-mat_str-el |
Strong in-plane anisotropy in the electronic structure of fixed-valence
$β$-LuAlB$_4$: The origin of intrinsic quantum criticality in the heavy-fermion
superconductor $\beta$-YbAlB$_4$ has been attributed to strong Yb valence
fluctuations and its peculiar crystal structure. Here, we assess these
contributions individ... | cond-mat_str-el |
Photoinduced Structural Phase Transitions in Polyacene: There exist two types of structural instability in polyacene: double bonds in
a cis pattern and those in a trans pattern. They are isoenergetic but
spectroscopically distinct. We demonstrate optical characterization and
manipulation of Peierls-distorted polyacene ... | cond-mat_str-el |
Emergent particle-hole symmetry in the half-filled Landau level: We provide an effective description of a particle-hole symmetric state of
electrons in a half-filled Landau level, starting from the traditional approach
pioneered by Halperin, Lee and Read. Specifically, we study a system consisting
of alternating quasi-... | cond-mat_str-el |
Reduction of ordered moment and Neel temperature of quasi
one-dimensional antiferromagnets Sr2CuO3 and Ca2CuO3: We report elastic neutron diffraction and muon spin relaxation (muSR)
measurements of the quasi one-dimensional antiferromagnets Sr2CuO3 and Ca2CuO3,
which have extraordinarily reduced TN/J ratios. We obser... | cond-mat_str-el |
Random singlet-like phase of disordered Hubbard chains: Local moment formation is ubiquitous in disordered semiconductors such as
Si:P, where it is observed both in the metallic and the insulating regimes.
Here, we focus on local moment behavior in disordered insulators, which arises
from short-ranged, repulsive electr... | cond-mat_str-el |
Paramagnetism in the kagome compounds
(Zn,Mg,Cd)Cu$_{3}$(OH)$_{6}$Cl$_{2}$: Frustrated magnetism on the kagome lattice has been a fertile ground for rich
and fascinating physics, ranging from experimental evidence of a spin liquid to
theoretical predictions of exotic superconductivity. Among experimentally
realized s... | cond-mat_str-el |
Local magnetic moment formation and Kondo screening in the half filled
two dimensional single band Hubbard model: We study formation of local magnetic moments in strongly correlated Hubbard
model within dynamical mean field theory and associate peculiarities of
temperature dependence of local charge $\chi_c$ and spin... | cond-mat_str-el |
Orbital superexchange and crystal field simultaneously at play in YVO3:
resonant inelastic x-ray scattering at the V L edge and the O K edge: We report on the observation of orbital excitations in YVO3 by means of
resonant inelastic x-ray scattering (RIXS) at energies across the vanadium L3
and oxygen K absorption ed... | cond-mat_str-el |
Spin-triplet f-wave pairing due to three-site cyclic-exchange
ferromagnetic interactions: Ferromagnetiam and superconductivity in a two-dimensional triangular-lattice
Hubbard model are studied using the density-matrix renormalization group
method. We propose a mechanism of the {\it f}-wave spin-triplet pairing derive... | 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 |
Electronic correlations and magnetic interactions in infinite-layer
NdNiO$_2$: The large antiferromagnetic exchange coupling in the parent high-$T_{\rm c}$
cuprate superconductors is believed to play a crucial role in pairing the
superconducting carriers. The recent observation of superconductivity in
hole-doped infi... | cond-mat_str-el |
Computation of dynamical correlation functions of Heisenberg chains: the
gapless anisotropic regime: We compute all dynamical spin-spin correlation functions for the spin-1/2
$XXZ$ anisotropic Heisenberg model in the gapless antiferromagnetic regime,
using numerical sums of exact determinant representations for form ... | cond-mat_str-el |
de Haas-van Alphen oscillations in quasi-two-dimensional underdoped
cuprate superconductors in the canonical ensemble: We calculate the de Haas-van Alphen (dHvA) effect waveform using the
canonical ensemble for different Fermi surface scenarios applicable to the
underdoped cuprate superconductor YBa2Cu3O6.5, in which... | cond-mat_str-el |
Magnon-phonon interactions in magnetic insulators: We address the theory of magnon-phonon interactions and compute the
corresponding quasi-particle and transport lifetimes in magnetic insulators
with focus on yttrium iron garnet at intermediate temperatures from anisotropy-
and exchange-mediated magnon-phonon interacti... | cond-mat_str-el |
Construction of Variational Matrix Product States for the Heisenberg
Spin-1 Chain: We propose a simple variational wave function that captures the correct
ground state energy of the spin-1 Heisenberg chain model to within 0.04\%. The
wave function is written in the matrix product state (MPS) form with the bond
dimens... | cond-mat_str-el |
A Simple Treatment of Metal-Insulator Transition: Effects of Degeneracy,
Temperature and Applied Magnetic Field: A simple slave-boson representation combined with the Hartree-Fock
approximation for the Hund's rule coupling is introduced for a doubly
degenerate narrow band, which bears a direct relation to that introd... | cond-mat_str-el |
Prototypical many-body signatures in transport properties of
semiconductors: We devise a methodology for charge, heat, and entropy transport driven by
carriers with finite lifetimes. Combining numerical simulations with analytical
expressions for low temperatures, we establish a comprehensive and
thermodynamically co... | cond-mat_str-el |
Coexisting charge-ordered states with distinct driving mechanisms in
monolayer VSe$_2$: Thinning crystalline materials to two dimensions (2D) creates a rich
playground for electronic phases, including charge, spin, superconducting, and
topological order. Bulk materials hosting charge density waves (CDWs), when
reduce... | cond-mat_str-el |
Double-Exchange Model on Triangle Chain: We study ground state properties of the double-exchange model on triangle
chain in the classical limit on $t_{2g}$ spins. The ground state is determined
by a competition among the kinetic energy of the $e_g$ electron, the
antiferromagnetic exchange energy between the $t_{2g}$ sp... | cond-mat_str-el |
Bose condensation in a model microcavity: We study the equilibrium properties of a system of dipole-active excitons
coupled to a single photon mode at fixed total excitation. Treating the
presence or absence of a trapped exciton as a two-level system produces a model
that is exactly soluble. It gives a simple descripti... | cond-mat_str-el |
Incommensurate magnetic orders and topological Hall effect in the
square-net centrosymmetric EuGa$_2$Al$_2$ system: Neutron diffraction on the centrosymmetric square-net magnet EuGa$_2$Al$_2$
reveals multiple incommensurate magnetic states (AFM1,2,3) in zero field. In
applied field, a new magnetic phase (A) is identi... | cond-mat_str-el |
Magnetic excitations in the low-temperature ferroelectric phase of
multiferroic YMn2O5 using inelastic neutron scattering: We studied magnetic excitations in a low-temperature ferroelectric phase of
the multiferroic YMn2O5 using inelastic neutron scattering (INS). We identify
low-energy magnon modes and establish a c... | cond-mat_str-el |
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