5 papers
Alleviating the Sign Problem in Quantum Monte Carlo Simulations of Spin-Orbit-Coupled Multi-Orbital Hubbard Models
Aaram J. Kim, Philipp Werner, Roser Valentí
We present a strategy to alleviate the sign problem in continuous-time quantum Monte Carlo (CTQMC) simulations of the dynamical-mean-field-theory (DMFT) equations for the spin-orbi…
Spin and charge correlations across the metal-to-insulator crossover in the half-filled Hubbard model
Aaram J. Kim, Fedor Simkovic, Evgeny Kozik
The Hubbard model with nearest-neighbour hopping on the square lattice and an average of one electron per site is known to undergo an extended crossover from metallic to insul…
Multi-valuedness of the Luttinger-Ward functional in the Fermionic and Bosonic System with Replicas
Aaram J. Kim, Vincent Sacksteder
We study the properties of the Luttinger-Ward functional (LWF) in a simplified Hubbard-type model without time or spatial dimensions, but with identical replicas located on a s…
Extended crossover from Fermi liquid to quasi-antiferromagnet in the half-filled 2D Hubbard model
Fedor Šimkovic, J. P. F. LeBlanc, Aaram J. Kim +4
The ground state of the Hubbard model with nearest-neighbor hopping on the square lattice at half filling is known to be that of an antiferromagnetic (AFM) band insulator for any o…
Electron dichotomy on the SrTiO defect surface augmented by many-body effects
Frank Lechermann, Harald O. Jeschke, Aaram J. Kim +2
In a common paradigm, the electronic structure of condensed matter is divided into weakly and strongly correlated compounds. While conventional band theory usually works well for t…