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Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
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116 papers · 1 filter
Neutron scattering evidence for two-dimensionally coupled spin-dimerized antiferromagnetic lattice in α-Cu2P2O7
B. Ghanta, K. S. Chikara, M. Ghanathe +3
The microscopic magnetic model of the low-dimensional quantum magnet alpha-Cu2P2O7 has remained controversial. We present a comprehensive study of its magnetic ground state and exc…
Dynamics of superconducting pairs in the two-dimensional Hubbard model
G. Sordi, E. M. O'Callaghan, C. Walsh +3
The frequency structure of the superconducting correlations in cuprates gives insights on the pairing mechanism. Here we present an exhaustive study of this problem in the two-dime…
Particle-hole Symmetric Slave Boson Method for the Mixed Valence Problem
Liam L. H. Lau, Piers Coleman
We introduce an analytic slave boson method for treating the finite Anderson impurity model. Our approach introduces two bosons to track both valenc…
Magnetic excitations and exchange parameters of a nickel chain compound PbMnNiTeO: Neutron scattering and density functional theory studies
S. Uthayakumar, D. T. Adroja, Amit Pokhriyal +10
We have investigated the quasi-one dimensional Ni-chain compound PbMnNiTeO using theoretical DFT calculations, inelastic neutron scattering and optical spectrosc…
A higher dimensional generalization of the Kitaev spin liquid
Po-Jui Chen, Piers Coleman
We construct an exactly solvable model of a four-dimensional Kitaev spin liquid. The lattice structure is orthorhombic and each unit-cell contains six sublattice degrees of freedom…
Charge gap and charge redistribution among copper and oxygen orbitals in the normal state of the Emery model
G. L. Reaney, N. Kowalski, A. -M. S. Tremblay +1
Unraveling the behavior of the electrons in the copper-oxygen planes of cuprate superconductors remains a challenge. Here we examine the electronic charge redistribution among plan…
Resolving the Thermal Paradox: Many-body localization or fractionalization?
Saikat Banerjee, Piers Coleman
Thermal measurements of heat capacity and thermal conductivity in a wide range of insulators and superconductors exhibit a ``thermal paradox": a large linear specific heat reminisc…
Microscopic theory of pair density waves in spin-orbit coupled Kondo lattice
Aaditya Panigrahi, Alexei Tsvelik, Piers Coleman
We demonstrate that the discommensuration between the Fermi surfaces of a conduction sea and an underlying spin liquid provides a natural mechanism for the spontaneous formation of…
Topological superconductivity in a spin-orbit coupled Kondo lattice
Zekun Zhuang, Piers Coleman
We consider the effect of spin-orbit coupling on a two-dimensional Kondo Lattice model, in which conduction electrons are antiferromagnetically coupled to a Yao-Lee spin liquid. Wh…
Ambipolar doping of a charge-transfer insulator in the Emery model
G. Sordi, G. L. Reaney, N. Kowalski +2
Understanding the similarities and differences between adding or removing electrons from a charge-transfer insulator may provide insights about the origin of the electron-hole asym…
Breakdown of order-fractionalization in the CPT model
Aaditya Panigrahi, Alexei Tsvelik, Piers Coleman
We present an analysis of the half-filled CPT model, an analytically tractable Kondo lattice model with Yao-Lee spin-spin interactions on a 3D hyperoctagon lattice, proposed by Col…
Flat bands, strange metals, and the Kondo effect
Joseph G. Checkelsky, B. Andrei Bernevig, Piers Coleman +2
Flat band materials such as the kagome metals or moiré superlattice systems are of intense current interest. Flat bands can result from the electron motion on numerous (special) la…
Superconductivity in the two-dimensional Hubbard model with cellular dynamical mean-field theory: a quantum impurity model analysis
C. Walsh, M. Charlebois, P. Sémon +2
Doping a Mott insulator gives rise to unconventional superconducting correlations. Here we address the interplay between d-wave superconductivity and Mott physics using the two-dim…
Magnetic excitation spectrum and Hamiltonian of the quantum spin chain BaCuTe2O6
A. Samartzis, S. Chillal, H. O. Jeschke +4
The magnetic excitation spectrum and Hamiltonian of the quantum magnet BaCuTe2O6 is studied by inelastic neutron scattering (INS) and density functional theory (DFT). INS on powder…
Quantum order by disorder in Frustrated Spin Nanotubes
João C. Getelina, Zekun Zhuang, Premala Chandra +3
We investigate quantum order by disorder in a frustrated spin nanotube formed by wrapping a - Heisenberg model at 45 around a cylinder. Using Schwinger boson theo…
TBG as Topological Heavy Fermion: II. Analytical approximations of the model parameters
Dumitru Călugăru, Maksim Borovkov, Liam L. H. Lau +3
The recently-introduced Topological Heavy Fermion (THF) model [Phys. Rev. Lett. 129, 047601] of twisted bilayer graphene (TBG) aims to reconcile the quantum-dot-like electronic str…
Topological Mixed Valence Model for Twisted Bilayer Graphene
Liam L. H. Lau, Piers Coleman
Song and Bernevig (SB) have recently proposed a topological heavy fermion description of the physics of magic angle twisted bilayer graphene (MATBG), involving the hybridization of…
Analytic calculation of the vison gap in the Kitaev spin liquid
Aaditya Panigrahi, Piers Coleman, Alexei Tsvelik
Although the ground-state energy of the Kitaev spin liquid can be calculated exactly, the associated vison gap energy has to date only been calculated numerically from finite size…
Matrix Product Study of Spin Fractionalization in the 1D Kondo Insulator
Jing Chen, E. Miles Stoudenmire, Yashar Komijani +1
The Kondo lattice is one of the classic examples of strongly correlated electronic systems. We conduct a controlled study of the Kondo lattice in one dimension, highlighting the ro…
Microstructuring YbRh2Si2 for resistance and noise measurements down to ultra-low temperatures
Alexander Steppke, Sandra Hamann, Markus König +9
The discovery of superconductivity in the quantum critical Kondo-lattice system YbRh2Si2 at an extremely low temperature of 2 mK has inspired efforts to perform high-resolution ele…
Emergent many-body composite excitations of interacting spin-1/2 trimers
A. K. Bera, S. M. Yusuf, S. K. Saha +4
Understanding exotic forms of magnetism in quantum spin systems is an emergent topic of modern condensed matter physics. Quantum dynamics can be described by particle-like carriers…
Magnetotransport of single crystal SmIrO across the pressure-induced quantum-critical phase boundary
M. J. Coak, K. Götze, T. Northam De La Fuente +6
Rare-earth pyrochlore iridates host two interlocking magnetic sublattices of corner-sharing tetrahedra and can harbour a unique combination of frustrated moments, exotic excitation…
Electro-nuclear transition into a spatially modulated magnetic state in YbRhSi
J. Knapp, L. V. Levitin, J. Nyéki +7
The nature of the antiferromagnetic order in the heavy fermion metal YbRhSi, its quantum criticality, and superconductivity, which appears at low mK temperatures, remain op…
Prediction of anomalies in the velocity of sound for the pseudogap of hole-doped cuprates
C. Walsh, M. Charlebois, P. Sémon +2
We predict sound anomalies at the doping where the pseudogap ends in the normal state of hole-doped cuprates. Our prediction is based on the two-dimensional compressible Hu…