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Spin waves in the spiral phase of a doped antiferromagnet: a
strong-coupling approach: We study spin fluctuations in the spiral phase of the two-dimensional Hubbard
model at low doping on the basis of the spin-particle-hole coherent-state path
integral. In the strong correlation limit, we obtain an analytical express... | cond-mat_str-el |
Bosonic Short Range Entangled states Beyond Group Cohomology
classification: We explore and construct a class of bosonic short range entangled (BSRE)
states in all $4k+2$ spatial dimensions, which are higher dimensional
generalizations of the well-known Kitaev's $E_8$ state in 2d. These BSRE states
share the followin... | cond-mat_str-el |
Topological charge pumping in excitonic insulators: We show that in excitonic insulators with $s$-wave electron-hole pairing, an
applied electric field (either pulsed or static) can induce a $p$-wave
component to the order parameter, and further drive it to rotate in the $s+ip$
plane, realizing a Thouless charge pump. ... | cond-mat_str-el |
Emergent topological spin structures in a centrosymmetric cubic
perovskite: The skyrmion crystal (SkX) characterized by a multiple-q helical spin
modulation has been reported as a unique topological state that competes with
the single-q helimagnetic order in non-centrosymmetric materials. Here we
report the discovery... | cond-mat_str-el |
Unfrustrating the t-J Model: d-wave BCS Superconductivity in the
$t'$-$J_z$-$V$ Model: The t-J model is believed to be a minimal model that may be capable of
describing the low-energy physics of the cuprate superconductors. However,
although the t-J model is simple in appearance, obtaining a detailed
understanding of... | cond-mat_str-el |
On the Problem of the Staggered Field in CuGeO3 Doped with Magnetic
Impurities: The magnitude of the staggered field is calculated from the EPR data for
CuGeO3 doped with Co and Fe magnetic impurities. It is found that this
parameter demonstrate an anomalous temperature and magnetic field dependence
probably due to (... | cond-mat_str-el |
Emergent gravity in graphene: We reconsider monolayer graphene in the presence of elastic deformations. It
is described by the tight - binding model with varying hopping parameters. We
demonstrate, that the fermionic quasiparticles propagate in the emergent 2D
Weitzenbock geometry and in the presence of the emergent U(... | cond-mat_str-el |
High magnetic field phase diagram and weak FM breaking in
(Ni0.93Co0.07)3V2O8: We present magnetostriction and thermal expansion measurements on
multiferroic (Ni0.93Co0.07)3V2O8. The high field phase diagrams up to 33 T
along the a, b and c directions are built. For H//a, as the magnetic field
increases, two intermed... | cond-mat_str-el |
QMC study of the chiral Heisenberg Gross-Neveu universality class: We investigate a quantum criticality of an antiferromagnetic phase transition
in the Hubbard model on a square lattice with a $d$-wave pairing field by
large-scale auxiliary-field quantum Monte Carlo simulations. Since the $d$-wave
pairing filed induces... | cond-mat_str-el |
Ferromagnetic fluctuation and possible triplet superconductivity in
Na_xCoO_2*yH_2O: Fluctuation-exchange study of multi-orbital Hubbard model: Spin and charge fluctuations and superconductivity in a recently discovered
superconductor Na_xCoO_2*yH_2O are studied based on a multi-orbital Hubbard
model. Tight-binding p... | cond-mat_str-el |
Cascade of field-induced magnetic transitions in a frustrated
antiferromagnetic metal: Frustrated magnets can exhibit many novel forms of order when exposed to high
magnetic fields, however, much less is known about materials where frustration
occurs in the presence of itinerant electrons. Here we report thermodynami... | cond-mat_str-el |
Resonant inelastic X-ray scattering response of the Kitaev honeycomb
model: We calculate the resonant inelastic X-ray scattering (RIXS) response of the
Kitaev honeycomb model, an exactly solvable quantum-spin-liquid model with
fractionalized Majorana and flux excitations. We find that the fundamental RIXS
channels, t... | cond-mat_str-el |
Parasitic small-moment-antiferromagnetism and non-linear coupling of
hidden order and antiferromagnetism in URu2Si2 observed by Larmor diffraction: We report simultaneous measurements of the distribution of lattice constants
and the antiferromagnetic moment in high-purity URu2Si2, using both Larmor and
conventional n... | cond-mat_str-el |
Antiferromagnetism in semiconducting SrMn2Sb2 and BaMn2Sb2 single
crystals: Crystals of SrMn2Sb2 and BaMn2Sb2 were grown using Sn flux and characterized
by powder and single-crystal x-ray diffraction, respectively, and by
single-crystal electrical resistivity rho, heat capacity Cp, and magnetic
susceptibility chi mea... | cond-mat_str-el |
Quantum Criticality of Topological Phase Transitions in 3D Interacting
Electronic Systems: Topological phase transitions in condensed matters accompany emerging
singularities of the electronic wave function, often manifested by gap-closing
points in the momentum space. In conventional topological insulators in three
... | cond-mat_str-el |
Thermal DMRG for highly frustrated quantum spin chains: a user
perspective: Thermal DMRG is investigated with emphasis of employability in molecular
magnetism studies. To this end magnetic observables at finite temperature are
evaluated for two one-dimensional quantum spin systems: a Heisenberg chain with
nearest-nei... | cond-mat_str-el |
Thermodynamic and information-theoretic description of the Mott
transition in the two-dimensional Hubbard model: At the Mott transition, electron-electron interaction changes a metal, in
which electrons are itinerant, to an insulator, in which electrons are
localized. This phenomenon is central to quantum materials. ... | cond-mat_str-el |
How Hidden Orders Generate Gaps in 1D Fermionic Systems: We demonstrate that hidden long range order is always present in the gapped
phases of interacting fermionic systems on one dimensional lattices. It is
captured by correlation functions of appropriate nonlocal charge and/or spin
operators, which remain asymptotica... | cond-mat_str-el |
Evidence for Anisotropic Kondo Behavior in Ce0.8La0.2Al3: We have performed an inelastic neutron scattering study of the low energy
spin dynamics of the heavy fermion compound Ce0.8La0.2Al3 as a function of
temperature and external pressure up to 5 kbar. At temperatures below 3 K, the
magnetic response transforms from ... | cond-mat_str-el |
Diagrammatic theory for Anderson Impurity Model. Stationary property of
the thermodynamic potential: A diagrammatic theory around atomic limit is proposed for normal state of
Anderson Impurity Model. The new diagram method is based on the ordinary Wick's
theorem for conduction electrons and a generalized Wick's theor... | cond-mat_str-el |
Competing Ground States of a Peierls-Hubbard Nanotube: Motivated by iodo platinum complexes assembled within a quadratic-prism
lattice, [Pt(C$_2$H$_8$N$_2$)(C$_{10}$H$_8$N$_2$)I]$_4$(NO$_3$)$_8$, we
investigate the ground-state properties of a Peierls-Hubbard four-legged tube.
Making a group-theoretical analysis, we sy... | cond-mat_str-el |
Phase Thermalization: from Fermi Liquid to Incoherent Metal: When a system consists of a large subsystem (bath) and a small one (probe),
thermalization implies induction of temperature of the bath onto the probe. If
both the bath and the probe are described by same microscopic Hamiltonian,
thermalization further entail... | cond-mat_str-el |
Dimensional-Crossover-Driven Mott Insulators in SrVO3 Ultrathin Films: High-quality epitaxial SrVO3 (SVO) thin films of various thicknesses were
grown on (001)-oriented LSAT substrates by pulsed electron-beam deposition
technique. Thick SVO films (~25 nm) exhibited metallic behavior with the
electrical resistivity foll... | cond-mat_str-el |
Fermi- to non-Fermi-liquid crossover and Kondo transition in
two-dimensional Cu$_{2/3}$V$_{1/3}$V$_2$S$_4$: By means of a specific heat ($C$) and electrical resistivity ($\varrho$)
study, we give evidence of a pronounced Fermi liquid (FL) behavior with sizable
mass renormalization, $m^{\ast}/m = 30$, up to unusually ... | cond-mat_str-el |
An effect of Sm vacancies on the hybridization gap in topological Kondo
insulator candidate SmB$_6$: A necessary element for the predicted topological state in Kondo insulator
SmB$_6$ is the hybridization gap which opens in this compound at low
temperatures. In this work, we present a comparative study of the in-gap
... | cond-mat_str-el |
Exact solution of the topological symplectic Kondo problem: The Kondo effect is an archetypical phenomenon in the physics of strongly
correlated electron systems. Recent attention has focused on the application of
Kondo physics to quantum information science by exploiting overscreened Kondo
impurities with residual any... | cond-mat_str-el |
Manifestation of topological behaviors in interacting Weyl systems:
one-body verse two-body correlations: Understanding correlation effects in topological phases of matter is at the
forefront of current research in condensed matter physics. Here we try to
clarify some subtleties in studying topological behaviors of i... | cond-mat_str-el |
Revised crystal structure and electronic properties of high dielectric
Ba(Fe$_{1/2}$Nb$_{1/2}$)O$_{3}$ ceramics: Ba(Fe$_{1/2}$Nb$_{1/2}$)O$_3$ (BFN) ceramics are considered to be promising
for technological applications owing to their high dielectric constant over a
wide range of temperatures. However, there exists c... | cond-mat_str-el |
Capturing long range correlations in two-dimensional quantum lattice
systems using correlator product states: We study the suitability of correlator product states for describing
ground-state properties of two-dimensional spin models. Our ansatz for the
many-body wave function takes the form of either plaquette or bo... | cond-mat_str-el |
Resistivity and Thermal Conductivity of an Organic Insulator
beta'-EtMe3Sb[Pd(dmit)2]2: A finite residual linear term in the thermal conductivity at zero temperature
in insulating magnets indicates the presence of gapless excitations of
itinerant quasiparticles, which has been observed in some candidate materials
of ... | cond-mat_str-el |
Restricted Boltzmann Machines for Quantum States with Nonabelian or
Anyonic Symmetries: Although artificial neural networks have recently been proven to provide a
promising new framework for constructing quantum many-body wave functions, the
parameterization of a quantum wavefunction with nonabelian symmetries in ter... | cond-mat_str-el |
Kondo effect and STM spectra through ferromagnetic nanoclusters: Motivated by recent scanning tunneling microscope (STM) experiments on cobalt
clusters adsorbed on single wall metallic nanotubes [Odom {\em et al.}, Science
{\bf 290}, 1549 (2000)], we study theoretically the size dependence of STM
spectra and spin-flip ... | cond-mat_str-el |
Resonant Nernst effect in the metallic and field-induced spin density
wave states of (TMTSF)2ClO4: We examine an unusual phenomenon where, in tilted magnetic fields near magic
angles parallel to crystallographic planes, a "giant" resonant Nernst signal
has been observed by Wu et al.[Phys. Rev. Lett. 91 56601(2003)] i... | cond-mat_str-el |
Simple mechanisms that impede the Berry phase identification from
magneto-oscillations: The phase of quantum magneto-oscillations is often associated with the Berry
phase and is widely used to argue in favor of topological nontriviality of the
system (Berry phase $2\pi n+\pi$). Nevertheless, the experimentally determ... | cond-mat_str-el |
Investigation of Ultrafast Demagnetization and Gilbert Damping and their
Correlation in Different Ferromagnetic Thin Films Grown Under Identical
Conditions: Following the demonstration of laser-induced ultrafast demagnetization in
ferromagnetic nickel, several theoretical and phenomenological propositions
have soug... | cond-mat_str-el |
High-density two-dimensional small polaron gas in a delta-doped Mott
insulator: Heterointerfaces in complex oxide systems open new arenas in which to test
models of strongly correlated material, explore the role of dimensionality in
metal-insulator-transitions (MITs) and small polaron formation. Close to the
quantum ... | cond-mat_str-el |
Dissipative Majorana quantum wires: In this paper, we formulate and quantitatively examine the effect of
dissipation on topological systems. We use a specific model of Kitaev quantum
wire with an onsite Ohmic dissipation, and perform a numerically exact quantum
Monte Carlo simulation to investigate this interacting ope... | cond-mat_str-el |
Spin model for the Honeycomb $\rm NiPS_3$: In the Van der Waal material $\rm NiPS_3$, Ni atoms have spin S=1 and realize
a honeycomb lattice. Six sulfur atoms surround each Ni and split their d
manifold into three filled and two unfilled bands. Aimed to determine the spin
Hamiltonian of $\rm NiPS_3$, we study its excha... | cond-mat_str-el |
Determination of Fermi surface by charge density correlations: The Fermi surface topology in the two-dimensional Hubbard model is
particularly relevant for the high-temperature superconductors, whereas its
theoretical research encounters with the difficulty of the analytical
continuation problem. To this end, we propos... | cond-mat_str-el |
Duality and ground-state phase diagram for the quantum XYZ model with
arbitrary spin $s$ in one spatial dimension: Five duality transformations are unveiled for the quantum XYZ model with
arbitrary spin $s$ in one spatial dimension. The presence of these duality
transformations drastically reduces the entire ground-s... | cond-mat_str-el |
High-pressure versus isoelectronic doping effect on the honeycomb
iridate Na$_2$IrO$_3$: We study the effect of isoelectronic doping and external pressure in tuning
the ground state of the honeycomb iridate Na$_2$IrO$_3$ by combining optical
spectroscopy with synchrotron x-ray diffraction measurements on single
cryst... | cond-mat_str-el |
Quantum correlations in the spin-1/2 Heisenberg XXZ chain with modulated
Dzyaloshinskii-Moriya interaction: We study a one-dimensional spin-1/2 XXZ Heisenberg model with alternating
Dzyaloshinskii- Moriya interaction, using the numerical Lanczos method.
Recently, the ground state (GS) phase diagram of this model has ... | cond-mat_str-el |
Quantum magnetism on the Cairo pentagonal lattice: We present an extensive analytical and numerical study of the
antiferromagnetic Heisenberg model on the Cairo pentagonal lattice, the dual of
the Shastry-Sutherland lattice with a close realization in the S=5/2 compound
Bi2Fe4O9. We consider a model with two exchange c... | cond-mat_str-el |
Gaussian state approximation of quantum many-body scars: Quantum many-body scars are atypical, highly nonthermal eigenstates of
kinetically constrained systems embedded in a sea of thermal eigenstates. These
special eigenstates are characterized, for example, by a bipartite entanglement
entropy that scales as most loga... | cond-mat_str-el |
A phason disordered two dimensional quantum antiferromagnet: We examine a novel type of disorder in quantum antiferromagnets. Our model
consists of localized spins with antiferromagnetic exchanges on a bipartite
quasiperiodic structure, which is geometrically disordered in such a way that
no frustration is introduced. ... | cond-mat_str-el |
Patterning of two-dimensional electron systems in SrTiO3 based
heterostructures using a CeO2 template: Two-dimensional electron systems found at the interface of SrTiO3-based oxide
heterostructures often display anisotropic electric transport whose origin is
currently under debate. To characterize transport along spe... | cond-mat_str-el |
Odd-Parity Triplet Pair Induced by Hund's Rule Coupling: We discuss microscopic aspects of odd-parity triplet pair in orbital
degenerate systems. From the concept of off-diagonal long-range order, a pair
state is unambiguously defined as the eigenstate with the maximum eigenvalue of
pair correlation function. Performin... | cond-mat_str-el |
Intrinsic Structural Disorder and the Magnetic Ground State in Bulk
EuTiO3: The magnetic properties of single-crystal EuTiO3 are suggestive of nanoscale
disorder below its cubic-tetragonal phase transition. We demonstrate that
electric field cooling acts to restore monocrystallinity, thus confirming that
emergent str... | cond-mat_str-el |
Superfluid-Insulator transition of quantum Hall domain walls in bilayer
graphene: We consider the zero-filled quantum-Hall ferromagnetic state of bilayer
graphene subject to a kink-like perpendicular electric field, which generates
domain walls in the electronic state and low-energy collective modes confined
to move ... | cond-mat_str-el |
Probabilistic Simulation of Quantum Circuits with the Transformer: The fundamental question of how to best simulate quantum systems using
conventional computational resources lies at the forefront of condensed matter
and quantum computation. It impacts both our understanding of quantum materials
and our ability to emul... | cond-mat_str-el |
Tripartite entangled plaquette state in a cluster magnet: Using large-scale quantum Monte Carlo simulations we show that a spin-$1/2$
XXZ model on a two-dimensional anisotropic Kagome lattice exhibits a tripartite
entangled plaquette state that preserves all of the Hamiltonian symmetries. It
is connected via phase boun... | cond-mat_str-el |
Magnetic behavior, Griffiths phase and magneto-transport study in 3$d$
based nano-crystalline double perovskite Pr$_2$CoMnO$_6$: Double perovskite (DP) oxide material receive extensive research interest due
to exciting physical properties with potential technological application. 3$d$
based DP oxides are promising fo... | cond-mat_str-el |
Electrical and thermal transport in van der Waals magnets
2H-M$_x$TaS$_2$ (M = Mn, Co): We report a detailed study of electrical and thermal transport properties in
2H-M$_x$TaS$_2$ (M = Mn, Co) magnets where M atoms are intercalated in the van
der Waals gap. The intercalation induces ferromagentism with an easy-plane... | cond-mat_str-el |
Matrix Product State applications for the ALPS project: The density-matrix renormalization group method has become a standard
computational approach to the low-energy physics as well as dynamics of
low-dimensional quantum systems. In this paper, we present a new set of
applications, available as part of the ALPS packag... | cond-mat_str-el |
Doping Effects on the two-dimensional Spin Dimer Compound
$SrCu_2(BO_3)_2$: A series of compounds M$_{0.1}$Sr$_{0.9}$Cu$_2$(BO$_3$)$_2$ with Sr
substituted by M=Al, La, Na and Y were prepared by solid state reaction. XRD
analysis showed that these doping compounds are isostructural to
SrCu$_2$(BO$_3$)$_2$. The magnet... | cond-mat_str-el |
Magnetism in Kitaev Quantum Spin Liquid Candidate RuBr$_3$: The present studies show that long-range magnetic order takes place in
RuBr$_3$ at $\approx$ 34 K. The observations of clear oscillations in the muon
time spectra demonstrate the presence of well-defined internal fields at the
muon sites. The magnetic ordering... | cond-mat_str-el |
Combining complex and radial slave boson fields within the
Kotliar-Ruckenstein representation of correlated impurities: The gauge symmetry group of any slave boson representation allows to gauge
away the phase of bosonic fields. One benefit of this radial field formulation
is the elimination of spurious Bose condensa... | cond-mat_str-el |
Microscopic model realization of $\boldsymbol{d}$-wave pseudospin
current order in Sr$_{\boldsymbol{2}}$IrO$_{\boldsymbol{4}}$: The $d$-wave pseudospin current order ($d$PSCO) with staggered circulating
pseudospin current has been proposed as the hidden electronic order to describe
the unexpected breaking of spatial ... | cond-mat_str-el |
Valley dependent many-body effects in 2D semiconductors: We calculate the valley degeneracy ($g_v$) dependence of the many-body
renormalization of quasiparticle properties in multivalley 2D semiconductor
structures due to the Coulomb interaction between the carriers. Quite
unexpectedly, the $g_v$ dependence of many-bod... | cond-mat_str-el |
Destruction of long-range order in non-collinear two-dimensional
antiferromagnets by random-bond disorder: We consider frustrated Heisenberg antiferromagnets, whose clean-limit ground
state is characterized by non-collinear long-range order with non-zero vector
chirality, and study the effects of quenched bond disord... | cond-mat_str-el |
On the dangers of partial diagrammatic summations: Benchmarks for the
two-dimensional Hubbard model in the weak-coupling regime: We study the two-dimensional Hubbard model in the weak-coupling regime and
compare the self-energy obtained from various approximate diagrammatic schemes
to the result of diagrammatic Monte... | cond-mat_str-el |
Hall resistance in quantum Hall metals due to Pancharatnam phase
retardation and energy level spacing: We derive the trial Hall resistance formula for the quantum Hall metals to
address both the integer and fractional quantum Hall effects. Within the
degenerate Landau levels, Zeeman splitting and level crossings in t... | cond-mat_str-el |
Kondo effect due to a hydrogen impurity in graphene: a multichannel
Kondo problem with diverging hybridization: We consider the Kondo effect arising from a hydrogen impurity in graphene. As
a first approximation, the strong covalent bond to a carbon atom removes that
carbon atom without breaking the $C_{3}$ rotation ... | cond-mat_str-el |
Spin Correlations in Quantum Wires: We consider theoretically spin correlations in an 1D quantum wire with
Rashba-Dresselhaus spin-orbit interaction (RDI). The correlations of
non-interacting electrons display electron-spin resonance at a frequency
proportional to the RDI coupling. Interacting electrons on varying the
... | cond-mat_str-el |
Coulomb correlation effects in LaOFeAs: LDA+DMFT(QMC) study: Effects of Coulomb correlation on LaOFeAs electronic structure have been
investigated by LDA+DMFT(QMC) method. The calculation results show that LaOFeAs
is in the regime of intermediate correlation strength with significant part of
the spectral density moved ... | cond-mat_str-el |
Spin-frame field theory of a three-sublattice antiferromagnet: We present a nonlinear field theory of a three-sublattice hexagonal
antiferromagnet. The order parameter is the spin frame, an orthogonal triplet
of vectors related to sublattice magnetizations and spin chirality. The
exchange energy, quadratic in spin-fram... | cond-mat_str-el |
Transport properties of Metallic Ruthenates: a DFT+DMFT investigation: We present a systematical theoretical study on the transport properties of an
archetypal family of Hund's metals, Sr$_2$RuO$_4$,Sr$_3$Ru$_2$O$_7$, SrRuO$_3$
and CaRuO$_3$, within the combination of first principles density functional
theory and dyna... | cond-mat_str-el |
Fermi liquid state and enhanced electron correlations in the new iron
pnictide CaFe$_4$As$_3$: The newly discovered CaFe$_4$As$_3$ system displays low-temperature Fermi
liquid behavior, with enhanced electron-electron correlations. At high
temperatures, the magnetic susceptibility shows Curie-Weiss behavior, with a
l... | cond-mat_str-el |
A Criterion for Strange Metallicity in the Lorenz Ratio: The Wiedemann-Franz (WF) law, stating that the Lorenz ratio $L =
\kappa/(T\sigma)$ between the thermal and electrical conductivities in a metal
approaches a universal constant $L_0=\pi^2 k_B^2/ (3 e^2)$ at low temperatures,
is often interpreted as a signature of ... | cond-mat_str-el |
Spin-filtering by field dependent resonant tunneling: We consider theoretically transport in a spinfull one-channel interacting
quantum wire placed in an external magnetic field. For the case of two
point-like impurities embedded in the wire, under a small voltage bias the
spin-polarized current occurs at special point... | cond-mat_str-el |
Signatures of a liquid-crystal transition in spin-wave excitations of
skyrmions: Understanding the spin-wave excitations of chiral magnetic order, such as the
skyrmion crystal (SkX), is of fundamental interest to confirm such exotic
magnetic order. The SkX is realized by competing Dzyaloshinskii-Moriya and
ferromagne... | cond-mat_str-el |
Candidate local parent Hamiltonian for 3/7 fractional quantum Hall
effect: While a parent Hamiltonian for Laughlin $1/3$ wave function has been long
known in terms of the Haldane pseudopotentials, no parent Hamiltonians are
known for the lowest-Landau-level projected wave functions of the composite
fermion theory at ... | cond-mat_str-el |
On the effective reconstruction of expectation values from ab initio
quantum embedding: Quantum embedding is an appealing route to fragment a large interacting
quantum system into several smaller auxiliary `cluster' problems to exploit the
locality of the correlated physics. In this work we critically review
approach... | cond-mat_str-el |
On the origin of the quantum-critical transition in the bilayer
Heisenberg model: The bilayer Heisenberg antiferromagnet is known to exhibit a quantum-critical
transition at a particular value of the inter-layer coupling. Using a new type
of coherent state, appropriate to the special order parameter structure of the
... | cond-mat_str-el |
Interacting Topological Superconductors and possible Origin of $16n$
Chiral Fermions in the Standard Model: Motivated by the observation that the Standard Model of particle physics
(plus a right-handed neutrino) has precisely 16 Weyl fermions per generation,
we search for $(3+1)$-dimensional chiral fermionic theories... | cond-mat_str-el |
Short-range antiferromagnetic correlations in the superconducting state
of filled skutterudite alloys Pr$_{1-x}$Eu$_x$Pt$_4$Ge$_{12}$: Motivated by current research efforts towards exploring the interplay between
magnetism and superconductivity in multiband electronic systems, we have
investigated the effects of Eu s... | cond-mat_str-el |
Temperature-driven hidden 5f itinerant-localized crossover in
heavy-fermion compound PuIn3: The temperature-dependent evolution pattern of 5f electrons helps to
elucidate the long-standing itinerant-localized dual nature in plutonium-based
compounds. In this work, we investigate the correlated electronic states of
Pu... | cond-mat_str-el |
Flat-band ferromagnetism in a correlated topological insulator on a
honeycomb lattice: We study the flat-band ferromagnetic phase of a spinfull and time-reversal
symmetric Haldane-Hubbard model on a honeycomb lattice within a bosonization
formalism for flat-band Z$_2$ topological insulators. Such a study extend our
p... | cond-mat_str-el |
Theory of Half-metallic Ferrimagnetism in Double Perovskites: We present a comprehensive theory of the temperature- and disorder-dependence
of half-metallic ferrimagnetism in the double perovskite Sr$_2$FeMoO$_6$ (SFMO)
with $T_c$ above room temperature. We show that the magnetization $M(T)$ and
conduction electron pol... | cond-mat_str-el |
Exact band structures for 1D superlattices beyond the tight-binding
approximation: The band structures describing non-interacting particles in one-dimensional
superlattices of arbitrary periodicity are obtained by an analytical
diagonalization of the Hamiltonian without adopting the popular tight-binding
approximatio... | cond-mat_str-el |
Spin Dynamics at Very Low Temperature in Spin Ice Dy$_2$Ti$_2$O$_7$: We have performed AC susceptibility and DC magnetic relaxation measurements
on the spin ice system Dy$_2$Ti$_2$O$_7$ down to 0.08 K. The relaxation time of
the magnetization has been estimated below 2 K down to 0.08 K. The spin
dynamics of Dy$_2$Ti$_2... | cond-mat_str-el |
Exact solution of electronic transport in semiconductors dominated by
scattering on polaronic impurities: The scattering of electrons on impurities with internal degrees of freedom is
bound to produce the signatures of the scatterer's own dynamics and results in
nontrivial electronic transport properties. Previous st... | cond-mat_str-el |
Electronic structure and parity effects in correlated nanosystems: We discuss the spectral, transport and magnetic properties of quantum
nanowires composed of N\leq 13 atoms and containing either even or odd numbers
of valence electrons. In our approach we combine Exact Diagonalization and Ab
Initio calculations (EDABI... | cond-mat_str-el |
Colloquium: Hidden Order, Superconductivity, and Magnetism -- The
Unsolved Case of URu2Si2: This Colloquium reviews the 25 year quest for understanding the continuous
(second-order) mean-field-like phase transition occurring at 17.5 K in URu2Si2.
About ten years ago, the term hidden order (HO) was coined and has sinc... | cond-mat_str-el |
Universal Duality in Luttinger Liquid Coupled to Generic Environment: We study a Luttinger Liquid (LL) coupled to a generic environment consisting
of bosonic modes with arbitrary density-density and current-current
interactions. The LL can be either in the conducting phase and perturbed by a
weak scatterer or in the in... | cond-mat_str-el |
Effective electron-electron interaction in a two dimensional
paramagnetic system: We analyze the effective electron-electron interaction in a two dimensional
polarized paramagnetic system. The spin degree of freedom, s, is manifestly
present in the expressions of spin dependent local field factors that describe
the s... | cond-mat_str-el |
Electron-phonon coupling and spin-charge separation in one-dimensional
Mott insulators: We examine the single-particle excitation spectrum in the one-dimensional
Hubbard-Holstein model at half-filling by performing the dynamical density
matrix renormalization group (DDMRG) calculation. The DDMRG results are
interpret... | cond-mat_str-el |
Anomalous Hall Effect in Graphite: We report on the experimental observation of an anomalous Hall effect (AHE)
in highly oriented pyrolytic graphite samples. The overall data indicate that
the AHE in graphite can be self-consistently understood within the frameworks
of the magnetic-field-driven excitonic pairing models... | cond-mat_str-el |
Gapless edge states of BF field theory and translation-symmetric Z2 spin
liquids: We study possible gapless edge states of translation-symmetric Z2 spin
liquids. The gapless edge states emerge from dangling Majorana fermions at the
boundary. We construct a series of mean-field Hamiltonians of Z2 spin liquids
on the s... | cond-mat_str-el |
Quantum phase transitions in d-wave superconductors: Motivated by the strong, low temperature damping of nodal quasiparticles
observed in some cuprate superconductors, we study quantum phase transitions in
d_{x^2-y^2} superconductors with a spin-singlet, zero momentum, fermion
bilinear order parameter. We present a com... | cond-mat_str-el |
Renormalized SO(5) symmetry in ladders with next-nearest-neighbor
hopping: We study the occurrence of SO(5) symmetry in the low-energy sector of
two-chain Hubbard-like systems by analyzing the flow of the running couplings
($g$-ology) under renormalization group in the weak-interaction limit. It is
shown that SO(5) i... | cond-mat_str-el |
Fine structures in the spectrum of the open-boundary Heisenberg chain at
large anisotropies: At large anisotropies, the spectrum of the Heisenberg XXZ spin chain
separates into `bands' with energies largely determined by the number of domain
walls. The band structure is richer with open boundary conditions: there are... | cond-mat_str-el |
Smeared quantum phase transition in the dissipative random quantum Ising
model: We investigate the quantum phase transition in the random transverse-field
Ising model under the influence of Ohmic dissipation. To this end, we
numerically implement a strong-disorder renormalization-group scheme. We find
that Ohmic diss... | cond-mat_str-el |
Two Anderson impurities in a 2D host with Rashba spin-orbit interaction: We have studied the two-dimensional two-impurity Anderson model with
additional Rashba spin-orbit interaction by means of the modified perturbation
theory. The impurity Green's functions we have constructed exactly reproduce
the first four spectra... | cond-mat_str-el |
Origin of infrared peaks in the optical conductivity of ytterbium
compounds: We have calculated optical conductivity [$\sigma(\omega)$] spectra of
ytterbium compounds (YbAl$_3$, YbAl$_2$, YbCu$_2$Si$_2$, YbNi$_2$Ge$_2$,
YbInCu$_4$, YbRh$_2$Si$_2$, YbIr$_2$Si$_2$, and YbB$_{12}$) based on the direct
interband transiti... | cond-mat_str-el |
Spin functional renormalization group for dimerized quantum spin systems: We investigate dimerized quantum spin systems using the spin functional
renormalization group approach proposed by Krieg and Kopietz [Phys. Rev. B 99,
060403(R) (2019)] which directly focuses on the physical spin correlation
functions and avoids ... | cond-mat_str-el |
Novel Orbital Ordering induced by Anisotropic Stress in a Manganite Thin
Film: We performed resonant and nonresonant x-ray diffraction studies of a
Nd0.5Sr0.5MnO3 thin film that exhibits a clear first-order transition. Lattice
parameters vary drastically at the metal-insulator transition at 170K (=T_MI),
and superlat... | cond-mat_str-el |
Anisotropic Magnetic Response in Kondo Lattice with Antiferromagnetic
Order: Magnetic properties are investigated for the Kondo lattice by using the
continuous time quantum Monte Colro (CT-QMC) and the dynamical mean field
theory (DMFT). The DMFT+CT-QMC approach is extended so as to derive the
anisotropic magnetic re... | cond-mat_str-el |
Model for the Fractional Quantum Hall Effect problem: A simple one-dimensional model is proposed, in which N spinless repulsively
interacting fermions occupy M>N degenerate states. It is argued that the energy
spectrum and the wavefunctions of this system strongly resemble the spectrum
and wavefunctions of 2D electrons... | cond-mat_str-el |
Proximity-induced superconductivity in a 2D Kondo lattice of an
f-electron-based surface alloy: Realizing hybrids of low-dimensional Kondo lattices and superconducting
substrates leads to fascinating platforms for studying the exciting physics of
strongly correlated electron systems with induced superconducting pairi... | cond-mat_str-el |
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