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9 papers · 2 filters
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…