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On conservation of the of crystal lattice symmetry in transition at
Curie point in exchange magnets: We show that symmetry of the crystal lattice of exchange magnets (containing
only 3d magneto-active elements) does not change at the Curie point; only the
magnetic symmetry of the crystal is decreasing in the transiti... | cond-mat_str-el |
A fractionalised "$\mathbb{Z}_2$" classical Heisenberg spin liquid: Quantum spin systems are by now known to exhibit a large number of different
classes of spin liquid phases. By contrast, for \textit{classical} Heisenberg
models, only one kind of fractionalised spin liquid phase, the so-called
Coulomb or $U(1)$ spin l... | cond-mat_str-el |
Soft magnon contributions to dielectric constant in spiral magnets with
domain walls: Competing magnetic exchange interactions often result in non-collinear
magnetic states, such as spin spirals, which break the inversion symmetry and
induce ferroelectric polarization. The resulting strong interactions between
magnet... | cond-mat_str-el |
Basal-Plane Nonlinear Susceptibility: A Direct Probe of the Single-Ion
Physics in URu2Si2: The microscopic nature of the hidden order state in URu2Si2 is dependent on
the low-energy configurations of the uranium ions, and there is currently no
consensus on whether it is predominantly 5f^2 or 5f^3. Here we show that
m... | cond-mat_str-el |
Effects of Disorder on the Pressure-Induced Mott Transition in
$κ$-BEDT-TTF)$_2$Cu[N(CN)$_2$]Cl: We present a study of the influence of disorder on the Mott metal-insulator
transition for the organic charge-transfer salt
$\kappa$-(BEDT-TTF)$_2$Cu[N(CN)$_2$]Cl. To this end, disorder was introduced
into the system in a... | cond-mat_str-el |
Lattice dynamics and electronic excitations in a large family of lacunar
spinels with a breathing pyrochlore lattice structure: Reproducing the electronic structure of AM$_4$X$_8$ lacunar spinels with a
breathing pyrochlore lattice is a great theoretical challenge due to the
interplay of various factors. The characte... | cond-mat_str-el |
Ordered spin-ice state in the geometrically frustrated
metallic-ferromagnet Sm2Mo2O7: The recent discovery of Spin-ice is a spectacular example of non-coplanar
spin arrangements that can arise in the pyrochlore A2B2O7 structure. We present
magnetic and thermodynamic studies on the metallic-ferromagnet pyrochlore
Sm2M... | cond-mat_str-el |
Magnetic field-tuned quantum critical point in CeAuSb_2: Transport, magnetic and thermal properties at high magnetic fields (H) and
low temperatures (T) of the heavy fermion compound CeAuSb_2 are reported. At
H=0 this layered system exhibits antiferromagnetic order below T_N = 6 K.
Applying B along the inter-plane dire... | cond-mat_str-el |
Cobalt spin state above the valence and spin-state transition in
(Pr0.7Sm0.3)0.7Ca0.3CoO3: (Pr0.7Sm0.3)0.7Ca0.3CoO3 belongs to a class of cobalt oxides undergoing a
first-order transition (T* close to 90 K) associated to a coupled change in the
valence and spin-state degrees of freedom. The Curie-Weiss regime present... | cond-mat_str-el |
The evolution of the Non-Fermi Liquid behavior of BaVS$_3$ under high
pressure: Temperature, pressure, and magnetic field dependencies of the resistivity of
BaVS$_3$ were measured above the critical pressure of $p_{cr}$=2 GPa, which is
associated with the zero temperature insulator-to-metal (MI) transition. The
resis... | cond-mat_str-el |
Nontrivial ferrimagnetism of the Heisenberg model on the Union Jack
strip lattice: We study the ground-state properties of the S=1/2 antiferromagnetic
Heisenberg model on the Union Jack strip lattice by using the
exact-diagonalization and density matrix renormalization group methods. We
confirm a region of the interm... | cond-mat_str-el |
Destruction of the Kondo effect in a multi-channel Bose-Fermi Kondo
model: We consider the SU(N) x SU(kappa N) generalization of the spin-isotropic
Bose-Fermi Kondo model in the limit of large N. There are three fixed points
corresponding to a multi-channel non-Fermi liquid phase, a local spin-liquid
phase, and a Kon... | cond-mat_str-el |
Susceptibilities of Sr(Cu_(1-x)Zn_x)_2O_3 Studied by Quantum Monte Carlo
Simulation: The effects of non-magnetic impurities randomly doped into a two-leg
Heisenberg spin ladder are investigated. Using the continuous time quantum
Monte Carlo loop algorithm we calculate the uniform and staggered
susceptibilities of suc... | cond-mat_str-el |
Quantum aspects of "hydrodynamic" transport from weak electron-impurity
scattering: Recent experimental observations of apparently hydrodynamic electronic
transport have generated much excitement. However, the understanding of the
observed non-local transport (whirlpool) effects and parabolic
(Poiseuille-like) curren... | cond-mat_str-el |
Melting of excitonic insulator phase by an intense terahertz pulse in
Ta$_2$NiSe$_5$: In this study, the optical response to a terahertz pulse was investigated in
the transition metal chalcogenide Ta$_2$NiSe$_5$, a candidate excitonic
insulator. First, by irradiating a terahertz pulse with a relatively weak
electric ... | cond-mat_str-el |
Semiquantitative theory for high-field low-temperature properties of a
distorted diamond spin chain: We consider the antiferromagnetic Heisenberg model on a distorted diamond
chain and use the localized-magnon picture adapted to a distorted geometry to
discuss some of its high-field low-temperature properties. More s... | cond-mat_str-el |
Magnetic Order in Laser-Irradiated Kagome Antiferromagnets: Dispersionless "zero energy mode'' is one of the hallmarks of frustrated
kagome antiferromagnets (KAFMs). It points to extensive classically degenerate
ground-states. The "zero energy mode'' can be observed experimentally when
lifted to a flat mode at finite e... | cond-mat_str-el |
Disentangling a quantum antiferromagnet with resonant inelastic X-ray
scattering: Low-dimensional copper oxide lattices naturally manifest electronic states
with strong short range quantum entanglement, which are known to lead to
remarkable emergent material properties. However the nanometer scale many-body
wavefunct... | cond-mat_str-el |
In situ controllable magnetic phases in doped twisted bilayer
transition-metal dichalcogenides: We study the electronic structure of hole-doped transition metal
dichalcogenides for small twist-angels, where the onsite repulsion is extremely
strong. Using unbiased diagrammatic Monte Carlo simulations, we find evidence... | cond-mat_str-el |
Spin excitations in the kagome-lattice metallic antiferromagnet
Fe$_{0.89}$Co$_{0.11}$Sn: Kagome-lattice materials have attracted tremendous interest due to the broad
prospect for seeking superconductivity, quantum spin liquid states, and
topological electronic structures. Among them, the transition-metal kagome
latt... | cond-mat_str-el |
Peculiar behavior of the electrical resistivity of MnSi at the
ferromagnetic phase transition: The electrical resistivity of a single crystal of MnSi was measured across
its ferromagnetic phase transition line at ambient and high pressures. Sharp
peaks of the temperature coefficient of resistivity characterize the tr... | cond-mat_str-el |
Ground state of the frustrated Hubbard model within DMFT: energetics of
Mott insulator and metal from ePT and QMC: We present a new method, ePT, for extrapolating few known coefficients of a
perturbative expansion. Controlled by comparisons with numerically exact
quantum Monte Carlo (QMC) results, 10th order strong-c... | cond-mat_str-el |
La$_2$O$_3$Fe$_2$Se$_2$, a Mott insulator on the brink of
orbital-selective metalization: La$_2$O$_3$Fe$_2$Se$_2$ can be explained in terms of Mott localization in
sharp contrast with the metallic behavior of FeSe and other parent parent
compounds of iron superconductors. We demonstrate that the key ingredient that
m... | cond-mat_str-el |
MIEZE Neutron Spin-Echo Spectroscopy of Strongly Correlated Electron
Systems: Recent progress in neutron spin-echo spectroscopy by means of longitudinal
Modulation of IntEnsity with Zero Effort (MIEZE) is reviewed. Key technical
characteristics are summarized which highlight that the parameter range
accessible in mom... | cond-mat_str-el |
Vibrational edge modes in intrinsically heterogeneous doped transition
metal oxides: By applying an unrestricted Hartree-Fock and a Random Phase approximations to
a multiband Peierls-Hubbard Hamiltonian, we study the phonon mode structure in
models of transition metal oxides in the presence of intrinsic nanoscale
inh... | cond-mat_str-el |
Electronic structure of the kagome staircase compounds Ni3V2O8 and
Co3V2O8: The electronic structure of the kagome staircase compounds, Ni3V2O8 and
Co3V2O8, has been investigated using soft x-ray absorption, soft x-ray
emission, and resonant inelastic x-ray scattering (RIXS). Comparison between
the two compounds, and... | cond-mat_str-el |
Composite Dirac liquids: parent states for symmetric surface topological
order: We introduce exotic gapless states---`composite Dirac liquids'---that can
appear at a strongly interacting surface of a three-dimensional electronic
topological insulator. Composite Dirac liquids exhibit a gap to all charge
excitations bu... | cond-mat_str-el |
Optical studies of gap, hopping energies and the Anderson-Hubbard
parameter in the zigzag-chain compound SrCuO2: We have investigated the electronic structure of the zigzag ladder (chain)
compound SrCuO2 combining polarized optical absorption, reflection,
photoreflectance and pseudo-dielectric function measurements w... | cond-mat_str-el |
Entanglement in extended Hubbard models and quantum phase transitions: The role of two-point and multipartite entanglement at quantum phase
transitions (QPTs) in correlated electron systems is investigated. We consider
a bond-charge extended Hubbard model exactly solvable in one dimension which
displays various QPTs, w... | cond-mat_str-el |
Quantum versus thermal fluctuations in the fcc antiferromagnet:
alternative routes to order by disorder: In frustrated magnetic systems with competing interactions fluctuations can
lift the residual accidental degeneracy. We argue that the state selection may
have different outcomes for quantum and thermal order by d... | cond-mat_str-el |
Dynamical signatures of topological order in the driven-dissipative
Kitaev chain: We investigate the effects of dissipation and driving on topological order in
superconducting nanowires. Rather than studying the non-equilibrium steady
state, we propose a method to classify and detect dynamical signatures of
topologic... | cond-mat_str-el |
Incommensurate spin Luttinger liquid phase in a model for the
spin-Peierls materials TiOBr and TiOCl: In the present work we aim to characterize the lattice configurations and the
magnetic behavior in the incommensurate phase of spin-Peierls systems. This
phase emerges when the magnetic exchange interaction is couple... | cond-mat_str-el |
Interplay of electronic structure and unusual development in crystal
structure of YbAuIn and Yb$_{3}$AuGe$_{2}$In$_{3}$: First-principles calculations within the DFT are employed to investigate the
relationship between the electronic structure and the unexpected features of
the hexagonal cell parameters of YbAuIn and... | cond-mat_str-el |
Weak-field induced nonmagnetic state in a Co-based honeycomb: Layered honeycomb magnets are of interest as potential realizations of the
Kitaev quantum spin liquid (KQSL), a quantum state with long-range spin
entanglement and an exactly solvable Hamiltonian. Conventional magnetically
ordered states are present for all ... | cond-mat_str-el |
Observation of giant circular dichroism induced by electronic chirality: Chiral phases of matter, characterized by a definite handedness, abound in
nature, ranging from the crystal structure of quartz to spiraling spin states
in helical magnets. In $1T$-TiSe$_2$ a source of chirality has been proposed
that stands apart... | cond-mat_str-el |
Quantum Many-Body Scars from Einstein-Podolsky-Rosen States in Bilayer
Systems: Quantum many-body scar states are special eigenstates of nonintegrable models
with distinctive entanglement features that give rise to infinitely long-lived
coherent dynamics under quantum quenches from certain initial states. We
elaborat... | cond-mat_str-el |
Low-energy theory of the Nambu-Goldstone modes of an ultracold $^6Li-$
$^{40}K$ mixture in an optical lattice: A low-energy theory of the Nambu-Goldstone excitation spectrum and the
corresponding speed of sound of an interacting Fermi mixture of Lithium-6 and
Potassium-40 atoms in a two-dimensional optical lattice at... | cond-mat_str-el |
Low-energy optical properties of the non-magnetic kagome metal
CsV$_3$Sb$_5$: Temperature-dependent reflectivity measurements on the kagome metal
CsV$_3$Sb$_5$ in a broad frequency range of $50-20000$ cm$^{-1}$ down to $T$=10
K are reported. The charge-density wave (CDW) formed below $T_{\rm CDW}$ = 94 K
manifests it... | cond-mat_str-el |
Elastic Instabilities within Antiferromagnetically Ordered Phase in the
Orbitally-Frustrated Spinel GeCo$_2$O$_4$: Ultrasound velocity measurements of the orbitally-frustrated GeCo$_2$O$_4$
reveal unusual elastic instabilities due to the phonon-spin coupling within the
antiferromagnetic phase. Shear moduli exhibit an... | cond-mat_str-el |
Spin diffusion in the low-dimensional molecular quantum Heisenberg
antiferromagnet Cu(pyz)(NO$_{3}$)$_{2}$ detected with implanted muons: We present the results of muon-spin relaxation measurements of spin
excitations in the one-dimensional quantum Heisenberg antiferromagnet
Cu(pyz)(NO$_{3}$)$_{2}$. Using density-fun... | cond-mat_str-el |
A Model for the Schottky Anomaly in Metallic $Nd_{2-y}Ce_{y}CuO_{4}$: We present a simple model for the doped compound $Nd_{2-y}Ce_{y}CuO_{4}$, in
order to explain some recent experimental results on the latter. Within a
Hartree-Fock context, we start from an impurity Anderson-like model and
consider the magnetic split... | cond-mat_str-el |
Renormalization of f-levels away from the Fermi energy in electron
excitation spectroscopies: Density functional results of
Nd$_{2-x}$Ce$_x$CuO$_4$: Relaxation energies for photoemission, when an occupied electronic state is
excited, and for inverse photoemission, when an empty state is filled, are
calculated withi... | cond-mat_str-el |
The J_1-J_2 model revisited : Phenomenology of CuGeO_3: We present a mean field solution of the antiferromagnetic Heisenberg chain
with nearest (J_1) and next to nearest neighbor (J_2) interactions. This
solution provides a way to estimate the effects of frustration. We calculate
the temperature-dependent spin-wave vel... | cond-mat_str-el |
Block magnetic excitations in the orbitally selective Mott insulator
BaFe2Se3: Iron pnictides and selenides display a variety of unusual magnetic phases
originating from the interplay between electronic, orbital, and lattice degrees
of freedom. Using powder inelastic neutron scattering on the two-leg ladder
BaFe2Se3,... | cond-mat_str-el |
Scaling approach for the time-dependent Kondo model: We present a new nonperturbative method to deal with the time-dependent
quantum many-body problem, which is an extension of Wegner's flow equations to
time-dependent Hamiltonians. The formalism provides a scaling procedure for the
set of time-dependent interaction co... | cond-mat_str-el |
Spin polarized STM spectra of Dirac Fermions on the surface of a
topological insulator: We provide a theory for the tunneling conductance $G(V)$ of Dirac Fermions on
the surface of a topological insulator as measured by a spin-polarized scanning
tunneling microscope tip for low bias voltages $V$. We show that $G(V)$
... | cond-mat_str-el |
On the Field-Induced Gap in Cu Benzoate and Other S=1/2 Antiferromagnets: Recent experiments on the S=1/2 antiferromagnetic chain compound, Cu
benzoate, discovered an unexpected gap scaling as approximately the 2/3 power
of an applied magnetic field. A theory of this gap, based on an effective
staggered field, orthogon... | cond-mat_str-el |
Theory of Ca$_{10}$Cr$_7$O$_{28}$ as a bilayer breathing-kagome magnet:
Classical thermodynamics and semi-classical dynamics: Ca$_{10}$Cr$_7$O$_{28}$ is a novel spin-$1/2$ magnet exhibiting spin liquid
behaviour which sets it apart from any previously studied model or material.
However, understanding Ca$_{10}$Cr$_7$O... | cond-mat_str-el |
Magnetization, thermoelectric, and pressure studies of the magnetic
field-induced metal to insulator transition in tau phase organic conductors: We have investigated the magnetic field-induced metal-insulator transition in
the tau-phase organic conductors, which occurs in fields above 35 T, and below
14 K, by magneti... | cond-mat_str-el |
Efficient representation of long-range interactions in tensor network
algorithms: We describe a practical and efficient approach to represent physically
realistic long-range interactions in two-dimensional tensor network algorithms
via projected entangled-pair operators (PEPOs). We express the long-range
interaction ... | cond-mat_str-el |
Coexisting localized and itinerant gapless excitations in a quantum spin
liquid candidate 1T-TaS$_2$: To reveal the nature of elementary excitations in a quantum spin liquid
(QSL), we measured low temperature thermal conductivity and specific heat of
1T-TaS$_2$, a QSL candidate material with frustrated triangular lat... | cond-mat_str-el |
Fermi liquid identities for the Infinite U Anderson Model: We show how the electron gas methods of Luttinger, Ward and Nozi\`eres can be
applied to the infinite U Anderson impurity model within a Schwinger boson
treatment. Working to all orders in a 1/N expansion, we show how the Friedel
Langreth relationship, the Yama... | cond-mat_str-el |
Spin-Wave Theory for the Scalar Chiral Phase in the Multiple-Spin
Exchange Model on a Triangular Lattice: We study the effects of quantum fluctuations on a non-coplanar tetrahedral
spin structure, which has a scalar chiral order, in the spin-1/2 multiple-spin
exchange model with up to the six-spin exchange interactio... | cond-mat_str-el |
Magnetic hard-axis ordering near ferromagnetic quantum criticality: We investigate the interplay of quantum fluctuations and magnetic
anisotropies in metallic ferromagnets. Our central result is that fluctuations
close to a quantum critical point can drive the moments to point along a
magnetic hard axis. As a proof of ... | cond-mat_str-el |
LDA+DMFT Spectral Functions and Effective Electron Mass Enhancement in
Superconductor LaFePO: In this Letter we report the first LDA+DMFT results (method combining Local
Density Approximation with Dynamical Mean-Field Theory) for spectral properties
of superconductor LaFePO. Calculated {\bf k}-resolved spectral funct... | cond-mat_str-el |
Emerging frustration effects in ferromagnetic Ce_2[Pd_{1-x}Ag_x]_2In
alloys: Magnetic and thermal properties of Ferromagnetic (FM)
Ce_{2.15}(Pd_{1-x}Ag_x)_{1.95}In_{0.9} alloys were studied in order to
determine the Quantum Critical Point (QCP) at T_C => 0. The increase of band
electrons produced by Pd/Ag substitutio... | cond-mat_str-el |
Decoupled spin dynamics in the rare-earth orthoferrite YbFeO$_3$:
Evolution of magnetic excitations through the spin-reorientation transition: In this paper we present a comprehensive study of magnetic dynamics in the
rare-earth orthoferrite YbFeO$_3$ at temperatures below and above the
spin-reorientation (SR) transi... | cond-mat_str-el |
Orbital order in La0.5Sr1.5MnO4: beyond a common local Jahn-Teller
picture: The standard way to find the orbital occupation of Jahn-Teller (JT) ions is
to use structural data, with the assumption of a one-to-one correspondence
between the orbital occupation and the associated JT distortion, e.g. in O6
octahedron. We ... | cond-mat_str-el |
Realizing the strongly correlated $d$-Mott state in a fermionic cold
atom optical lattice: We show that a new state of matter, the d-wave Mott-insulator state (d-Mott
state) (introduced recently by [H. Yao, W. F. Tsai, and S. A. Kivelson, Phys.
Rev. B 76, 161104 (2007)]), which is characterized by a non-zero expectat... | cond-mat_str-el |
Pressure-Induced Antiferromagnetic Dome in the Heavy-Fermion
$Yb_2Pd_2In_{1-x}Sn_x$ System: In the heavy-fermion system $Yb_2Pd_2In_{1-x}Sn_x$, the interplay of
crystal-field splitting, Kondo effect, and Ruderman-Kittel-Kasuya-Yosida
interactions leads to complex chemical-, pressure-, and magnetic-field phase
diagram... | cond-mat_str-el |
Topological Phase Transition in the Hofstadter-Hubbard Model: We study the interplay between topological and conventional long range order
of attractive fermions in a time reversal symmetric Hofstadter lattice using
quantum Monte Carlo simulations, focussing on the case of one-third flux
quantum per plaquette. At half-... | cond-mat_str-el |
Photo-induced states in a Mott insulator: We investigate the properties of the metallic state obtained by photo-doping
carriers into a Mott insulator. In a strongly interacting system, these
carriers have a long life-time, so that they can dissipate their kinetic energy
to a phonon bath. In the relaxed state, the scatt... | cond-mat_str-el |
Magnetic Order in Laser-Irradiated Kagome Antiferromagnets: Dispersionless "zero energy mode'' is one of the hallmarks of frustrated
kagome antiferromagnets (KAFMs). It points to extensive classically degenerate
ground-states. The "zero energy mode'' can be observed experimentally when
lifted to a flat mode at finite e... | cond-mat_str-el |
From Quantum Wires to the Chern-Simons Description of the Fractional
Quantum Hall Effect: We show the explicit connection between two distinct and complementary
approaches to the fractional quantum Hall system (FQHS): the quantum wires
formalism and the topological low-energy effective description given in terms
of a... | cond-mat_str-el |
Novel quantum criticality due to emergent topological conservation law
in high-$T_c$ cuprates: We argue that in strongly correlated electron system collective instanton
excitations of the phase field (dual to the charge) arise with a great degree
of stability, governed by gauge flux changes by an integer multiple of ... | cond-mat_str-el |
Evolution of the 2D antiferromagnetism with temperature and magnetic
field in multiferroic Ba$_2$CoGe$_2$O$_7$: We report on spherical neutron polarimetry and unpolarized neutron
diffraction in zero magnetic field as well as flipping ratio and static
magnetization measurements in high magnetic fields on the multiferr... | cond-mat_str-el |
Flow equation analysis of the anisotropic Kondo model: We use the new method of infinitesimal unitary transformations to calculate
zero temperature correlation functions in the strong-coupling phase of the
anisotropic Kondo model. We find the dynamics on all energy scales including
the crossover behaviour from weak to ... | cond-mat_str-el |
Pseudoparticle Description of the 1D Hubbard Model Electronic Transport
Properties: We extend the pseudoparticle transport description of the Hubbard chain to
all energy scales. In particular we compute the mean value of the electric
current transported by any Bethe-ansatz state and the transport masses of the
charge... | cond-mat_str-el |
Majorana zero modes in a quantum Ising chain with longer-ranged
interactions: A one-dimensional Ising model in a transverse field can be mapped onto a
system of spinless fermions with p-wave superconductivity. In the weak-coupling
BCS regime, it exhibits a zero energy Majorana mode at each end of the chain.
Here, we ... | cond-mat_str-el |
Energy scales in 4f1 delafossite magnets: crystal-field splittings
larger than the strength of spin-orbit coupling in KCeO2: Ytterbium-based delafossites with effective S=1/2 moments are investigated
intensively as candidates for quantum spin-liquid ground states. While the
synthesis of related cerium compounds has a... | cond-mat_str-el |
Detection of gapped phases of a 1D spin chain with onsite and spatial
symmetries: We investigate the phase diagram of a quantum spin-1 chain whose Hamiltonian
is invariant under a global onsite $A_4$, translation and lattice inversion
symmetries. We detect different gapped phases characterized by SPT order and
symmet... | cond-mat_str-el |
In-plane magnetic field induced double fan spin structure with
$\textit{c}$-axis component in metallic kagome antiferromagnet
YMn$_{6}$Sn$_{6}$: The geometrical frustration nature of the kagome lattice makes it a great
host to flat electronic band, non-trivial topological properties, and novel
magnetisms. Metallic ... | cond-mat_str-el |
Electronic structure of Ce2RhIn8 2D heavy Fermion system studied by
angle resolved photoemission spectroscopy: We use angle-resolved photoemission spectroscopy to study heavy fermion
superconductor Ce2RhIn8. The Fermi surface is rather complicated and consists
of several hole and electron pock- ets. We do not observe... | cond-mat_str-el |
Superconductivity, pseudogap, and phase separation in topological flat
bands: a quantum Monte Carlo study: We study a two-dimensional model of an isolated narrow topological band at
partial filling with local attractive interactions. Numerically exact quantum
Monte Carlo calculations show that the ground state is a s... | cond-mat_str-el |
Quantum advantage in the charging process of Sachdev-Ye-Kitaev batteries: The exactly-solvable Sachdev-Ye-Kitaev (SYK) model has recently received
considerable attention in both condensed matter and high energy physics because
it describes quantum matter without quasiparticles, while being at the same
time the holograp... | cond-mat_str-el |
Relaxor ferroelectric behavior and intrinsic magnetodielectric behavior
near room temperature in Li2Ni2Mo3O12, a compound with distorted honeycomb
and spin-chains: Keeping current interests to identify materials with intrinsic
magnetodielectric behavior near room temperature and with novel pyroelectric
current anom... | cond-mat_str-el |
Theoretical constraints for the magnetic-dimer transition in
two-dimensional spin models: From general arguments, that are valid for spin models with sufficiently
short-range interactions, we derive strong constraints on the excitation
spectrum across a continuous phase transition at zero temperature between a
magnet... | cond-mat_str-el |
Quantized Berry Phases for a Local Characterization of Spin Liquids in
Frustrated Spin Systems: Recently by using quantized Berry phases, a prescription for a local
characterization of gapped topological insulators is given. One requires the
ground state is gapped and is invariant under some anti-unitary operation. A... | cond-mat_str-el |
Low frequency Raman response near Ising-nematic quantum critical point:
a memory matrix approach: Recent Raman scattering experiments have revealed a "quasi-elastic peak" in
$\mathrm{FeSe_{1-x}S_x}$ near an Ising-nematic quantum critical point (QCP)
\cite{zhang17}. Notably, the peak occurs at sub-temperature frequenc... | cond-mat_str-el |
Electronic correlations and crystal structure distortions in BaBiO3: BaBiO3 is a material where formally Bi4+ ions with the half-filled 6s-states
form the alternating set of Bi3+ and Bi5+ ions resulting in a charge ordered
insulator. The charge ordering is accompanied by the breathing distortion of
the BiO6 octahedra (... | cond-mat_str-el |
Quantum critical point in graphene approached in the limit of infinitely
strong Coulomb interaction: Motivated by the physics of graphene, we consider a model of N species of 2+1
dimensional four-component massless Dirac fermions interacting through a 3D
instantaneous Coulomb interaction. We show that in the limit of... | cond-mat_str-el |
Giant Positive Magnetoresistance and field-induced metal insulator
transition in Cr2NiGa: We report here the magneto-transport properties of the newly synthesized
Heusler compound Cr2NiGa which crystallizes in a disordered cubic B2 structure
belonging to Pm-3m space group. The sample is found to be paramagnetic down ... | cond-mat_str-el |
Small-angle interband scattering as the origin of the $T^{3/2}$
resistivity in MnSi: A possible explanation is given for the anomalous $T^{3/2}$ temperature
dependence of the electrical resistivity of MnSi, which is observed in the
high-pressure paramagnetic state. The unusual Fermi surface of MnSi includes
large ope... | cond-mat_str-el |
Exact results for the entanglement in 1D Hubbard models with spatial
constraints: We investigate the entanglement in Hubbard models of hardcore bosons in $1D$,
with an additional hardcore interaction on nearest neighbouring sites. We
derive analytical formulas for the bipartite entanglement entropy for any
number of ... | cond-mat_str-el |
Lattice and Electronic properties of VO$_2$ with the SCAN(+$U$) approach: Appropriate consideration of the electron correlation is essential to
reproduce the intriguing metal-insulator transition accompanying the
Peierls-type structural transition in VO$_2$. In the density functional
theory-based approach, this depends... | cond-mat_str-el |
Double exchange and orbital correlations in electron-doped manganites: A double exchange model for degenerate $e_g$ orbitals with intra- and
inter-orbital interactions has been studied for the electron doped manganites
A$_{1-x}$B$_{x}$MnO$_3$ ($x > 0.5$). We show that such a model reproduces the
observed phase diagram ... | cond-mat_str-el |
Quantum Confinement Transition in a d-wave Superconductor: We study the nature of the zero-temperature phase transition between a d-wave
superconductor and a Mott insulator in two dimensions. In this ``quantum
confinement transition'', spin and charge are confined to form the electron in
the Mott insulator. Within a du... | cond-mat_str-el |
One-dimensional conductance through an arbitrary potential: The finite-size Tomonaga-Luttinger Hamiltonian with an arbitrary potential is
mapped onto a non-interacting Fermi gas with renormalized potential. This is
done by means of flow equations for Hamiltonians and is valid for small
electron-electron interaction. Th... | cond-mat_str-el |
Emergent Bound States and Impurity Pairs in Chemically Doped
Shastry-Sutherland System: The search for novel unconventional superconductors is a central topic of
modern condensed matter physics. Similar to other Mott insulators,
Shastry-Sutherland (SSL) systems are predicted to become superconducting when
chemically ... | cond-mat_str-el |
Electronic Correlation Effects on Stabilizing a Perfect Kagome Lattice
and Ferromagnetic Fluctuation in LaRu$_3$Si$_2$: A perfect Kagome lattice features flat bands that usually lead to strong
electronic correlation effects, but how electronic correlation, in turn,
stabilizes a perfect Kagome lattice has rarely been ... | cond-mat_str-el |
Theoretical investigation of the behavior of CuSe2O5 compound in high
magnetic fields: Based on analytical and numerical approaches, we investigate thermodynamic
properties of CuSe2O5 at high magnetic fields which is a candidate for the
strong intra-chain interaction in quasi one-dimensional (1D) quantum magnets.
Mag... | cond-mat_str-el |
Control of magnetic interactions between surface adatoms via orbital
repopulation: We propose a reversible mechanism for switching Heisenberg-type exchange
interactions between deposited transition metal adatoms from ferromagnetic to
antiferromagnetic. Using first-principles calculations, we show that this
mechanism ... | cond-mat_str-el |
Neutron Scattering Studies of Spin Fluctuations in High Temperature
Superconductors: Neutron scattering can provide detailed information about the energy and
momentum dependence of the magnetic dynamics of materials provided sufficiently
large single crystals are available. This requirement has limited the number of
... | cond-mat_str-el |
Ce$_{2}$Ir$_{3}$Ga$_{5}$ : a new locally non-centrosymmetric heavy
fermion system: Recently, a new type of unconventional superconductivity with a field-induced
transition between two different superconducting (SC) states was discovered in
the heavy fermion system CeRh$_{2}$As$_{2}$. This unusual SC state was propose... | cond-mat_str-el |
Ce-L3-XAS study of the temperature dependence of the 4f occupancy in the
Kondo system Ce2Rh3Al9: We have used temperature dependent x-ray absorption at the Ce-L3 edge to
investigate the recently discovered Kondo compound Ce2Rh3Al9. The systematic
changes of the spectral lineshape with decreasing temperature are analy... | cond-mat_str-el |
Heisenberg Necklace Model in Magnetic Field: Motivated by the experimental realizations of nearly one-dimensional spin-1/2
Heisenberg model found in chain cuprates SrCuO$_2$ and Sr$_2$CuO$_3$, which
remain in a quantum-critical Luttinger liquid state down to temperatures that
are much lower than in-chain exchange coupl... | cond-mat_str-el |
Theory of electronic transport through a triple quantum dot in the
presence of magnetic field: Theory of electronic transport through a triangular triple quantum dot
subject to a perpendicular magnetic field is developed using a tight binding
model. We show that magnetic field allows to engineer degeneracies in the
t... | cond-mat_str-el |
Supersymmetry on the honeycomb lattice: resonating charge stripes,
superfrustration, and domain walls: We study a model of spinless fermions on the honeycomb lattice with
nearest-neighbor exclusion and extended repulsive interactions that exhibits
`lattice supersymmetry' [P. Fendley, K. Schoutens, and J. de Boer, Phy... | cond-mat_str-el |
Quantum Entanglement as a Diagnostic of Phase Transitions in Disordered
Fractional Quantum Hall Liquids: We investigate the disorder-driven phase transition from a fractional quantum
Hall state to an Anderson insulator using quantum entanglement methods. We find
that the transition is signaled by a sharp increase in ... | cond-mat_str-el |
Bethe ansatz description of edge-localization in the open-boundary XXZ
spin chain: At large values of the anisotropy \Delta, the open-boundary Heisenberg
spin-1/2 chain has eigenstates displaying localization at the edges. We present
a Bethe ansatz description of this `edge-locking' phenomenon in the entire
\Delta>1 ... | cond-mat_str-el |
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