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Raman response in the nematic phase of FeSe: Raman experiments on bulk FeSe revealed that the low-frequency part of
$B_{1g}$ Raman response $R_{B_{1g}}$, which probes nematic fluctuations,
rapidly decreases below the nematic transition at $T_n \sim 85$K. Such behavior
is usually associated with the gap opening and at a... | cond-mat_str-el |
Defect-Induced Low-Energy Majorana Excitations in the Kitaev Magnet
$α$-RuCl$_3$: The excitations in the Kitaev spin liquid (KSL) can be described by Majorana
fermions, which have characteristic field dependence of bulk gap and
topological edge modes. In the high-field state of layered honeycomb magnet
$\alpha$-RuCl$... | cond-mat_str-el |
Anisotropy of Kondo-lattice coherence in momentum space for CeCoIn5: We study the electronic and phononic excitations of heavy-fermion metal
CeCoIn$_5$ by polarization-resolved Raman spectroscopy to explore the
Kondo-lattice coherence. Below the coherence temperature T*\,=\,45\,K, the
continuum of electronic excitation... | cond-mat_str-el |
Excessive Noise as a Test for Many-Body Localization: Recent experimental reports suggested the existence of a finite-temperature
insulator in the vicinity of the superconductor-insulator transition. The rapid
decay of conductivity over a narrow temperature range was theoretically linked
to both a finite-temperature tr... | cond-mat_str-el |
Quantum Disordered Ground States in Frustrated Antiferromagnets with
Multiple Ring Exchange Interactions: We present a certain class of two-dimensional frustrated quantum Heisenberg
spin systems with multiple ring exchange interactions which are rigorously
demonstrated to have quantum disordered ground states without... | cond-mat_str-el |
Spin-phonon coupling effects in transition-metal perovskites:a DFT+$U$
and hybrid-functional study: Spin-phonon coupling effects, as reflected in phonon frequency shifts between
ferromagnetic (FM) and G-type antiferromagnetic (AFM) configurations in cubic
CaMnO$_3$, SrMnO$_3$, BaMnO$_3$, LaCrO$_3$, LaFeO$_3$ and La$_... | cond-mat_str-el |
Spinon Confinement and a Sharp Longitudinal Mode in Yb$_2$Pt$_2$Pb in
Magnetic Fields: The fundamental excitations in an antiferromagnetic chain of spins-1/2 are
spinons, de-confined fractional quasiparticles that when combined in pairs,
form a triplet excitation continuum. In an Ising-like spin chain the continuum
i... | cond-mat_str-el |
Relationship between single-particle excitation and spin excitation at
the Mott Transition: An intuitive interpretation of the relationship between the dispersion
relation of the single-particle excitation in a metal and that of the spin
excitation in a Mott insulator is presented, based on the results for the one-
a... | cond-mat_str-el |
Anomalous State Sandwiched between Fermi Liquid and Charge Ordered
Mott-Insulating Phases of Ti4O7: The Magneli phase Ti4O7 exhibits two sharp jumps in resistivity with coupled
structural transitions as a function of temperature at Tc1=142 K and Tc2=154 K.
We have studied electronic structure changes across the two t... | cond-mat_str-el |
Emergence of Jack ground states from two-body pseudopotentials in
fractional quantum Hall systems: The family of "Jack states" related to antisymmetric Jack polynomials are the
exact zero-energy ground states of particular model short-range {\em many-body}
repulsive interactions, defined by a few non-vanishing leadin... | cond-mat_str-el |
Emergent Dipole Gauge Fields and Fractons: We present a realization of fracton-elasticity duality purely formulated in
terms of ordinary gauge fields, encompassing standard elasticity and
incommensurate crystals as those describing twisted bilayer graphene,
quasicrystals or more general moir\'e lattices. Our constructi... | cond-mat_str-el |
Interactions in Quasicrystals: Although the effects of interactions in solid state systems still remains a
widely open subject, some limiting cases such as the three dimensional Fermi
liquid or the one-dimensional Luttinger liquid are by now well understood when
one is dealing with interacting electrons in {\it periodi... | cond-mat_str-el |
Holographic Dynamics from Multiscale Entanglement Renormalization Ansatz: The Multiscale Entanglement Renormalization Ansatz (MERA) is a tensor network
based variational ansatz that is capable of capturing many of the key physical
properties of strongly correlated ground states such as criticality and
topological order... | cond-mat_str-el |
Enhancement of superconductivity by pressure-induced critical
ferromagnetic fluctuations in UCoGe: A $^{59}$Co nuclear quadrupole resonance (NQR) was performed on a
single-crystalline ferromagnetic (FM) superconductor UCoGe under pressure. The
FM phase vanished at a critical pressure $P_c$, and the NQR spectrum just ... | cond-mat_str-el |
Spin Coulomb Drag: We introduce a distinctive feature of spin-polarized transport, the Spin
Coulomb Drag: there is an intrinsic source of friction for spin currents due to
the Coulomb interaction between spin ``up'' and spin ``down'' electrons. We
calculate the associated ``spin transrestistivity'' in a generalized ran... | cond-mat_str-el |
Dynamical Mean Field Theory, Density-Matrix Embedding Theory and
Rotationally Invariant Slave Bosons: a Unified Perspective: We present a unified perspective on Dynamical Mean Field Theory (DMFT),
Density-Matrix Embedding Theory (DMET) and Rotationally Invariant Slave Bosons
(RISB). We show that DMET can be regarded ... | cond-mat_str-el |
Interaction-driven Spontaneous Ferromagnetic Insulating States with Odd
Chern Numbers: Motivated by recent experimental work on moir\'e systems in a strong magnetic
field, we compute the compressibility as well as the spin correlations and
Hofstadter spectrum of spinful electrons on a honeycomb lattice with Hubbard
i... | cond-mat_str-el |
A Quantum Monte Carlo algorithm for out-of-equilibrium Green's functions
at long times: We present a quantum Monte-Carlo algorithm for computing the perturbative
expansion in power of the coupling constant $U$ of the out-of-equilibrium
Green's functions of interacting Hamiltonians of fermions. The algorithm
extends t... | cond-mat_str-el |
Kondo destruction in a quantum paramagnet with magnetic frustration: We report results of isothermal magnetotransport and susceptibility
measurements at elevated magnetic fields B down to very low temperatures T on
high-quality single crystals of the frustrated Kondo-lattice system CePdAl.
They reveal a B*(T) line with... | cond-mat_str-el |
Spin-rotationally symmetric domain flux phases in underdoped cuprates: We propose a new form of inhomogeneous phases consisting of out-of-phase
staggered flux domains separated by diagonal charged domain walls centered on
bonds or on sites. Remarkably, such domain flux phases are spin-rotationally
symmetric and exhibit... | cond-mat_str-el |
Spectral form factors of clean and random quantum Ising chains: We compute the spectral form factor of two integrable quantum-critical many
body systems in one spatial dimension. The spectral form factor of the quantum
Ising chain is periodic in time in the scaling limit described by a conformal
field theory; we also c... | cond-mat_str-el |
Transport Properties of the One Dimensional Ferromagnetic Kondo Lattice
Model : A Qualitative Approach to Oxide Manganites: The transport properties of the ferromagnetic Kondo lattice model in one
dimension are studied via bosonization methods. The antiferromagnetic
fluctuations, which normally appear because of the ... | cond-mat_str-el |
Magnetic Phase Diagram of Spin-1/2 Two-Leg Ladder with Four-Spin Ring
Exchange: We study the spin-1/2 two-leg Heisenberg ladder with four-spin ring exchanges
under a magnetic field. We introduce an exact duality transformation which is
an extension of the spin-chirality duality developed previously and yields a
new s... | cond-mat_str-el |
Spin-Dependent Correlations of Fermi Liquids at Nonzero Temperatures
within Correlated Density-Matrix Approach: Correlated density matrix theory is generalized to investigate equilibrium
properties of normal Fermi Liquids such as 3He and nuclear matter at nonzero
temperatures. The results also generalize the Fermi-hy... | cond-mat_str-el |
Symmetric Fracton Matter: Twisted and Enriched: In this paper, we explore the interplay between symmetry and fracton order,
motivated by the analogous close relationship for topologically ordered
systems. Specifically, we consider models with 3D planar subsystem symmetry,
and show that these can realize subsystem symme... | cond-mat_str-el |
Observation of Incompressibility at $ν=4/11$ and $ν=5/13$: The region of filling factors $1/3<\nu<2/5$ is predicted to support new types
of fractional quantum Hall states with topological order different from that of
the Laughlin-Jain or the Moore-Read states. Incompressibility is a necessary
condition for the formatio... | cond-mat_str-el |
Electronic structure of the $Sr_{0.4}Ca_{13.6}Cu_{24}O_{41}$
incommensurate compound: We extracted, from strongly-correlated ab-initio calculations, a complete
model for the chain subsystem of the $Sr_{0.4}Ca_{13.6}Cu_{24}O_{41}$
incommensurate compound. A second neighbor $t-J+V$ model has been determined as
a functi... | cond-mat_str-el |
TU$^2$FRG -- a scalable approach for truncated unity functional
renormalization group in generic fermionic models: Describing the emergence of phases of condensed matter is one of the central
challenges in physics. For this purpose many numerical and analytical methods
have been developed, each with their own strengt... | cond-mat_str-el |
Fermionology in the Kondo-Heisenberg model: the case of CeCoIn$_{5}$: Fermi surface of heavy electron systems plays a fundamental role in
understanding their variety of puzzling phenomena, for example, quantum
criticality, strange metal behavior, unconventional superconductivity and even
enigmatic phases with yet unkno... | cond-mat_str-el |
Interplay of Fractional Chern Insulator and Charge-Density-Wave Phases
in Twisted Bilayer Graphene: We perform an extensive exact diagonalization study of interaction driven
insulators in spin- and valley-polarized moir\'{e} flat bands of twisted
bilayer graphene aligned with its hexagonal boron nitride substrate. In... | cond-mat_str-el |
Anderson localization of spinons in a spin-1/2 antiferromagnetic
Heisenberg chain: Anderson localization is a general phenomenon of wave physics, which stems
from the interference between multiple scattering paths1,2. It was originally
proposed for electrons in a crystal, but later was also observed for light3-5,
mic... | cond-mat_str-el |
Structural Transitions in a Classical Two-Dimensional Molecule System: The ground state of a classical two-dimensional (2D) system with finite
number of charged particles, trapped by two positive impurities charges
localized at a distance (zo) from the 2D plane and separated from each other by
a distance xp are obtaine... | cond-mat_str-el |
Crystallization in the Fractional Quantum Hall Regime Induced by
Landau-level Mixing: The interplay between strongly correlated liquid and crystal phases for
two-dimensional electrons exposed to a high transverse magnetic field is of
fundamental interest. Through the non-perturbative fixed phase diffusion Monte
Carlo... | cond-mat_str-el |
Ab-initio determination of the localized/delocalized f-manifold in
UPd_2Al_3: The electronic structure of UPd_2Al_3 is described using the self-interaction
corrected local-spin-density approximation to density functional theory. The
groundstate is found to be characterized by the coexistence of localized (f^2)
and de... | cond-mat_str-el |
Temperature dependent bilayer ferromagnetism in Sr3Ru2O7: The Ruthenium based perovskites exhibit a wide variety of interesting
collective phenomena related to magnetism originating from the Ru 4d electrons.
Much remains unknown concerning the nature of magnetic fluctuations and
excitations in these systems. We present... | cond-mat_str-el |
Search for a quantum phase transition in U(Pt_(1-x)Pd_x)_3: Pd in U(Pt_{1-x}Pd_x)_3 suppresses the superconducting T_c to 0 K at critical
concentration x_c of 0.007 and induces a conventional AFM state for x > x_c.
The resistivity below 1 K shows a deviation from Fermi liquid behavior
described by a power law where the... | cond-mat_str-el |
Ground States of the Ising Model on the Shastry-Sutherland Lattice and
the Origin of the Fractional Magnetization Plateaus in Rare-Earth
Tetraborides: A complete and exact solution of the ground-state problem for the Ising model
on the Shastry-Sutherland lattice in the applied magnetic field is found. The
magnetiza... | cond-mat_str-el |
Nature of the glassy magnetic state in Cu$_{2.84}$Mn$_{0.44}$Al$_{0.72}$
shape memory alloy: The magnetic ground state of the ferromagnetic shape memory alloy of nominal
composition Cu$_{2.84}$Mn$_{0.44}$Al$_{0.72}$ was investigated. The sample
shows reentry of a glassy magnetic phase below the martensitic transition... | cond-mat_str-el |
High-Temperature Criticality in Strongly Constrained Quantum Systems: The exotic nature of many strongly correlated materials at reasonably high
temperatures, for instance cuprate superconductors in their normal state, has
lead to the suggestion that such behavior occurs within a quantum critical
region where the physi... | cond-mat_str-el |
Analytic continuation of the self-energy via Machine Learning techniques: We develop a novel analytic continuation method for self-energies on the
Matsubara domain as computed by quantum Monte Carlo simulations within
dynamical mean field theory (QMC+DMFT). Unlike a maximum entropy (maxEn)
procedure employed for the la... | cond-mat_str-el |
Probing light-driven quantum materials with ultrafast resonant inelastic
X-ray scattering: Ultrafast optical pulses are an increasingly important tool for controlling
quantum materials and triggering novel photo-induced phase transitions.
Understanding these dynamic phenomena requires a probe sensitive to spin,
charg... | cond-mat_str-el |
Commensurate and Incommensurate Structure of the Neutron Cross Section
in LaSrCuO and YBaCuO: We study the evolution of the d-wave neutron cross-section with variable
frequency \omega and fixed T (below and above Tc) in two different cuprate
families. The evolution from incommensurate to commensurate to incommensurat... | cond-mat_str-el |
Phase control of magnons in the van der Waals antiferromagnet NiPS$_3$: We demonstrate phase control of magnons in the van der Waals antiferromagnet
NiPS$_3$ using optical excitation by polarized light. The sign of the coherent
precession of spin amplitude changes upon (1) reversing the helicity of a
circularly polariz... | cond-mat_str-el |
Optimizing configurations for determining the magnetic model based on
ab-initio calculations: In this paper, it is presented a novel strategy to optimize the determination
of magnetic couplings by using ab-initio calculations of the energy. This
approach allows determining efficiently, in terms of a proposed effectiv... | cond-mat_str-el |
Order by disorder in classical kagome antiferromagnets with chiral
interactions: The Heisenberg antiferromagnet on the kagome lattice is an archetypal
instance of how large ground state degeneracies arise, and how they may get
resolved by thermal and quantum fluctuations. Augmenting the Heisenberg model
by chiral spi... | cond-mat_str-el |
The structure of spinful quantum Hall states: a squeezing perspective: We provide a set of rules to define several spinful quantum Hall model
states. The method extends the one known for spin polarized states. It is
achieved by specifying an undressed root partition, a squeezing procedure and
rules to dress the configu... | cond-mat_str-el |
Electronic correlations in organometallic complexes: We investigate an effective model for organometallic complexes (with
potential uses in optoelectronic devices) via both exact diagonalisation and
the configuration interaction singles (CIS) approximation. This model captures
a number of important features of organome... | cond-mat_str-el |
Non-Hermitian Mott Skin Effect: We propose a novel type of skin effects in non-Hermitian quantum many-body
systems which we dub a non-Hermitian Mott skin effect. This phenomenon is
induced by the interplay between strong correlations and the non-Hermitian
point-gap topology. The Mott skin effect induces extreme sensiti... | cond-mat_str-el |
63,65Cu Nuclear Resonance Study of the Coupled Spin Dimers and Chains
Compound Cu2Fe2Ge4O13: Nuclear magnetic resonance (NMR) and nuclear quadrupole resonance (NQR) of Cu
have been measured in a coupled spin dimers and chains compound Cu2Fe2Ge4O13.
Cu NQR has also been measured in an isostructural material Cu2Sc2Ge4O... | cond-mat_str-el |
Arrested Kondo effect and hidden order in URu_2Si_2: Complex electronic matter exhibit subtle forms of self organization which are
almost invisible to the available experimental tools, but which have dramatic
physical consequences. One prominent example is provided by the actinide based
heavy fermion material URu_2Si_2... | cond-mat_str-el |
Valence instability across magnetostructural transition in USb$_2$: We have performed pressure dependent X-ray diffraction and resonant X-ray
emission spectroscopy experiments on USb$_2$ to further characterize the AFM-FM
transition occurring near 8 GPa. We have found the magnetic transition
coincides with a tetragonal... | cond-mat_str-el |
Revisiting the electronic properties of dislocated graphene sheets: The interplay between topological defects, such as dislocations or
disclinations, and the electronic degrees of freedom in graphene has been
extensively studied. In the literature, for the study of this kind of problems,
it is in general used either a ... | cond-mat_str-el |
Exact SO(8) Symmetry in the Weakly-Interacting Two-Leg Ladder: A perturbative renormalization group analysis of interacting electrons on a
two-leg ladder reveals that at half-filling any weakly repulsive system scales
onto an exactly soluble Gross-Neveu model with a hidden SO(8) symmetry. The
half-filled ground state i... | 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 |
Critical charge fluctuations in a pseudogap Anderson model: The Anderson impurity model with a density of states $\rho(\varepsilon)
\propto |\varepsilon|^r$ containing a power-law pseudogap centered on the Fermi
energy ($\varepsilon = 0$) features for $0<r<1$ a Kondo-destruction quantum
critical point (QCP) separating ... | cond-mat_str-el |
Phonon spectral function of the one-dimensional Holstein-Hubbard model: We use the continuous-time interaction expansion (CT-INT) quantum Monte Carlo
method to calculate the phonon spectral function of the one-dimensional
Holstein-Hubbard model at half-filling. Our results are consistent with a
soft-mode Peierls transi... | cond-mat_str-el |
Weak topological insulating phases of hard-core-bosons on the honeycomb
lattice: We study the phases of hard-core-bosons on a two-dimensional periodic
honeycomb lattice in the presence of an on-site potential with alternating sign
along the different y-layers of the lattice. Using quantum Monte Carlo
simulations supp... | cond-mat_str-el |
Extending Density Matrix Embedding: A Static Two-Particle Theory: We introduce Extended Density Matrix Embedding Theory (EDMET), a static
quantum embedding theory explicitly self-consistent with respect to local
two-body physics. This overcomes the biggest practical and conceptual
limitation of more traditional one-bod... | cond-mat_str-el |
The observation of a positive magnetoresistance and close correlation
among lattice, spin and charge around TC in antipervoskite SnCMn3: The temperature dependences of magnetization, electrical transport, and
thermal transport properties of antiperovskite compound SnCMn3 have been
investigated systematically. A posit... | cond-mat_str-el |
Phase transitions in topological lattice models via topological symmetry
breaking: We study transitions between phases of matter with topological order. By
studying these transitions in exactly solvable lattice models we show how
universality classes may be identified and critical properties described. As a
familiar ... | cond-mat_str-el |
Dispersionless spin waves in Gadolinium Gallium Garnet: We report the results of neutron scattering on a powder sample of Gd3Ga5O12
at high magnetic fields. We find that in high fields (B>1.8 T) the system is
not fully polarized, but has a small canting of the moments induced by the
dipolar interaction. We show that th... | cond-mat_str-el |
Optimum ground states of generalized Hubbard models with next-nearest
neighbour interaction: We investigate the stability domains of ground states of generalized Hubbard
models with next-nearest neighbour interaction using the optimum groundstate
approach. We focus on the $\eta$-pairing state with momentum P=0 and th... | cond-mat_str-el |
High-resolution neutron depolarization microscopy of the ferromagnetic
transitions in Ni$_3$Al and HgCr$_2$Se$_4$ under pressure: We performed neutron imaging of ferromagnetic transitions in Ni$_3$Al and
HgCr$_2$Se$_4$ crystals. These neutron depolarization measurements revealed
bulk magnetic inhomogeneities in the f... | cond-mat_str-el |
Microscopic phase separation in triangular-lattice quantum spin magnet
kappa-(BEDT-TTF)2Cu2(CN)3 probed by muon spin relaxation: The ground state of the quantum spin system kappa-(BEDT-TTF)2Cu2(CN)3 in
which antiferromagnetically-interacting S=1/2 spins are located on a nearly
equilateral triangular lattice attracts ... | cond-mat_str-el |
Destabilization of the Zhang-Rice singlet at optimal doping: The construction of the Zhang-Rice singlet is revisited in the light of
recent understanding of high-temperature superconductors at optimal doping. A
minimal local model is derived which contains the physical regime found
relevant for ARPES experiments, chara... | cond-mat_str-el |
Quadriexcitons and excitonic condensate in a symmetric electron-hole
bilayer with valley degeneracy: Using quantum Monte Carlo simulations we have mapped out the zero temperature
phase diagram of a symmetric electron-hole bilayer with twofold valley
degeneracy, as function of the interlayer distance $d$ and in-layer ... | cond-mat_str-el |
Thermoelectric power in one-dimensional Hubbard model: The thermoelectric power S is studied within the one-dimensional Hubbard
model using the linear response theory and the numerical exact-diagonalization
method for small systems. While both the diagonal and off-diagonal dynamical
correlation functions of particle an... | cond-mat_str-el |
Remarkably robust and correlated coherence and antiferromagnetism in
(Ce$_{1-x}$La$_x$)Cu$_2$Ge$_2$: We present magnetic susceptibility, resistivity, specific heat, and
thermoelectric power measurements on (Ce$_{1-x}$La$_x$)Cu$_2$Ge$_2$ single
crystals (0 $\leq x\leq$ 1). With La substitution, the antiferromagnetic
t... | cond-mat_str-el |
Induced-Moment Weak Antiferromagnetism and Orbital Order on the
Itinerant-Localized Duality Model with Nested Fermi Surface: A Possible
Origin of Exotic Magnetism in URu${}_{2}$Si$_{2}$: The weak antiferromagnetism of URu${}_{2}$Si${}_{2}$ is discussed on the
basis of a duality model which takes into account salien... | cond-mat_str-el |
Spin--orbital interaction for face-sharing octahedra: Realization of a
highly symmetric SU(4) model: Specific features of orbital and spin structure of transition metal compounds
in the case of the face-sharing MO$_6$ octahedra are analyzed. In this
geometry, we consider the form of the spin--orbital Hamiltonian for ... | cond-mat_str-el |
A Lattice Model of Intercalation: The thermodynamics of the lattice model of intercalation of ions in crystals
is considered in the mean field approximation. Pseudospin formalism is used for
the description of interaction of electrons with ions and the possibility of
hopping of intercalated ions between different posit... | cond-mat_str-el |
Complex Quantum Phenomena in a Bilayered Calcium Ruthenate: Ca$_3$Ru$_2$O$_7$ undergoes an antiferromagnetic transition at
$T_{\text{N}}=56 $K, followed by a Mott-like (MI) transition at
$T_{\text{MI}}=48$ K. This nonmetallic ground state, with a charge gap of 0.1
eV, is suppressed by a highly anisotropic metamagnetic ... | cond-mat_str-el |
Collective charge excitations and the metal-insulator transition in the
square lattice Hubbard-Coulomb model: In this article, we discuss the non-trivial collective charge excitations
(plasmons) of the extended square-lattice Hubbard model. Using a fully
non-perturbative approach, we employ the hybrid Monte Carlo alg... | cond-mat_str-el |
Fate of entanglement in magnetism under Lindbladian or non-Markovian
dynamics and conditions for their transition to Landau-Lifshitz-Gilbert
classical dynamics: It is commonly assumed in spintronics and magnonics that localized spins
within antiferromagnets are in the N\'{e}el ground state (GS), as well as that
suc... | cond-mat_str-el |
Spin-Fluctuation Drag Thermopower of Nearly Ferromagnetic Metals: We investigate theoretically the Seebeck effect in materials close to a
ferromagnetic quantum critical point to explain anomalous behaviour at low
temperatures. It is found that the main effect of spin fluctuations is to
enhance the coefficient of the le... | cond-mat_str-el |
Simulation of braiding anyons using Matrix Product States: Anyons exist as point like particles in two dimensions and carry braid
statistics which enable interactions that are independent of the distance
between the particles. Except for a relatively few number of models which are
analytically tractable, much of the ph... | cond-mat_str-el |
Double Exchange in a Magnetically Frustrated System: This work examines the magnetic order and spin dynamics of a double-exchange
model with competing ferromagnetic and antiferromagnetic Heisenberg
interactions between the local moments. The Heisenberg interactions are
periodically arranged in a Villain configuration i... | cond-mat_str-el |
A neutron scattering study of two-magnon states in the quantum magnet
copper nitrate: We report measurements of the two-magnon states in a dimerized
antiferromagnetic chain material, copper nitrate (Cu(NO3)2*2.5D2O). Using
inelastic neutron scattering we have measured the one and two magnon excitation
spectra in a la... | cond-mat_str-el |
Collective spin excitations in a quantum spin ladder probed by
high-resolution Resonant Inelastic X-ray Scattering: We investigate magnetic excitations in the spin-ladder compound
Sr$_{14}$Cu$_{24}$O$_{41}$ using high-resolution Cu $L_3$-edge Resonant
Inelastic X-ray Scattering (RIXS). Our findings demonstrate that R... | cond-mat_str-el |
Competition between three-sublattice order and superfluidity in the
quantum 3-state Potts model of ultracold bosons and fermions on a square
optical lattice: We study a quantum version of the three-state Potts model that includes as
special cases the effective models of bosons and fermions on the square lattice
in ... | cond-mat_str-el |
Pairing Correlations on t-U-J Ladders: Pairing correlations on generalized t-U-J two-leg ladders are reported. We
find that the pairing correlations on the usual t-U Hubbard ladder are
significantly enhanced by the addition of a nearest-neighbor exchange
interaction J. Likewise, these correlations are also enhanced for... | cond-mat_str-el |
Slow scrambling and hidden integrability in a random rotor model: We analyze the out-of-time-order correlation functions of a solvable model of
a large number, $N$, of $M$-component quantum rotors coupled by
Gaussian-distributed random, infinite-range exchange interactions. We focus on
the growth of commutators of oper... | cond-mat_str-el |
Symmetry Enriched U(1) Topological Orders for Dipole-Octupole Doublets
on a Pyrochlore Lattice: Symmetry plays a fundamental role in our understanding of both conventional
symmetry breaking phases and the more exotic quantum and topological phases of
matter. We explore the experimental signatures of symmetry enriched... | cond-mat_str-el |
Anomalous heavy-fermion and ordered states in the filled skutterudite
PrFe4P12: Specific heat and magnetization measurements have been performed on
high-quality single crystals of filled-skutterudite PrFe_4P_{12} in order to
study the high-field heavy-fermion state (HFS) and low-field ordered state
(ODS). From a broa... | cond-mat_str-el |
Controlling structural distortion in the geometrically frustrated
layered cobaltate YBaCo4O7+δ by Fe substitution and its role on
magnetic correlations: Effects of Fe-substitution on the crystal structure and magnetic correlations
of the geometrically frustrated antiferromagnets YBaCo4-xFexO7+{\delta} (x = 0,
0.2, ... | cond-mat_str-el |
Colossal Positive Magnetoresistance in a Doped Nearly Magnetic
Semiconductor: We report on a positive colossal magnetoresistance (MR) induced by
metallization of FeSb$_{2}$, a nearly magnetic or "Kondo" semiconductor with 3d
ions. We discuss contribution of orbital MR and quantum interference to
enhanced magnetic fie... | 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 |
Magnetic state dynamics in itinerant paramagnet UM3B2 (M= Co, Ir) probed
by 11B NMR: We have carried out the $^{11}$B NMR measurement on the itinerant
paramagnetic systems U$M_{3}$B$_{2}$ ($M =$ Co, Ir) to investigate the
low-dimensional characteristics of the $5f$-electrons due to the structural
anisotropy. The rece... | cond-mat_str-el |
$Z_{2}$ fractionalized Chern/topological insulators in an exactly
soluble correlated model: In this paper we propose an exactly soluble model in two-dimensional
honeycomb lattice, from which two phases are found. One is the usual
Chern/topological insulating state and the other is an interesting $Z_2$
fractionalized ... | cond-mat_str-el |
Magnetoelectric behavior from cluster multipoles in square cupolas:
Study of Sr(TiO)Cu$_4$(PO$_4$)$_4$ in comparison with Ba and Pb
isostructurals: We report our combined experimental and theoretical study of magnetoelectric
properties of an antiferromagnet Sr(TiO)Cu$_4$(PO$_4$)$_4$, in comparison with
the isostruc... | cond-mat_str-el |
Observation of orbital order in the Van der Waals material 1T-TiSe2: Besides magnetic and charge order, regular arrangements of orbital occupation
constitute a fundamental order parameter of condensed matter physics. Even
though orbital order is difficult to identify directly in experiments, its
presence was firmly est... | cond-mat_str-el |
Signatures of broken parity and time-reversal symmetry in generalized
string-net models: We study indicators of broken time-reversal and parity symmetries in gapped
topological phases of matter. We focus on phases realized by Levin-Wen
string-net models, and generalize the string-net model to describe phases which
br... | cond-mat_str-el |
The ubiquitous 1100 charge ordering in organic charge-transfer solids: Charge and spin-orderings in the 1/4-filled organic CT solids are of strong
interest, especially in view of their possible relations to organic
superconductivity. We show that the charge order (CO) in both 1D and 2D CT
solids is of the ...1100... ty... | cond-mat_str-el |
Magnetism and metal-insulator transitions in the Rashba-Hubbard model: The nature of metal-insulator and magnetic transitions is still a subject
under intense debate in condensed matter physics. Amongst the many possible
mechanisms, the interplay between electronic correlations and spin-orbit
couplings is an issue of a... | cond-mat_str-el |
Physical realization of the four color problem in quantum systems: A multi-component electron model on a lattice is constructed whose ground
state exhibits a spontaneous ordering which follows the rule of map-coloring
used in the solution of the four color problem. The number of components is
determined by the Euler ch... | cond-mat_str-el |
Fermi arc criterion for surface Majorana modes in superconducting
time-reversal symmetric Weyl semimetals: Many clever routes to Majorana fermions have been discovered by exploiting
the interplay between superconductivity and band topology in metals and
insulators. However, realizations in semimetals remain less expl... | cond-mat_str-el |
An Operational Definition of Topological Order: The unrivaled robustness of topologically ordered states of matter against
perturbations has immediate applications in quantum computing and quantum
metrology, yet their very existence poses a challenge to our understanding of
phase transitions. However, a comprehensive u... | cond-mat_str-el |
Disturbing the dimers: electron- and hole-doping in the intermetallic
insulator FeGa$_3$: Insulating FeGa$_3$ poses peculiar puzzles beyond the occurrence of an
electronic gap in an intermetallic compound. This Fe-based material has a very
distinctive structural characteristic with the Fe atoms occurring in dimers.
T... | cond-mat_str-el |
Magnetic excitations of the field induced states in BaCo2(AsO4)2 probed
by time-domain terahertz spectroscopy: Searching for Kitaev quantum spin liquid (QSL) is a fascinating and
challenging problem. Much effort has been devoted to honeycomb lattice
candidates with strong spin-orbit coupling in 5d-electron iridates a... | cond-mat_str-el |
Phonon-induced topological insulation: We develop an approximate theory of phonon-induced topological insulation in
Dirac materials. In the weak coupling regime, long wavelength phonons may favor
topological phases in Dirac insulators with direct and narrow bandgaps. This
phenomenon originates from electron-phonon matr... | cond-mat_str-el |
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