221 citations · 944 across the 14 of their papers we have counts for
14 papers
High-order expansion around BCS theory
G. Spada, R. Rossi, F. Simkovic +4
We demonstrate that summation of connected diagrams to high order starting from a BCS hamiltonian is a viable generic unbiased approach for strongly correlated fermions in supercon…
Physical and unphysical regimes of self-consistent many-body perturbation theory
K. Van Houcke, E. Kozik, R. Rossi +2
In the standard framework of self-consistent many-body perturbation theory, the skeleton series for the self-energy is truncated at a finite order and plugged into th…
Polynomial complexity despite the fermionic sign
R. Rossi, N. Prokof'ev, B. Svistunov +2
It is commonly believed that in quantum Monte Carlo approaches to fermionic many- body problems, the infamous sign problem generically implies prohibitively large computational tim…
Dielectric function and thermodynamic properties of jellium in the GW approximation
Kris Van Houcke, Igor S. Tupitsyn, Andrey S. Mishchenko +1
The fully self-consistent GW approximation is an established method for electronic structure calculations. Its most serious deficiency is known to be an incorrect prediction of the…
Diagrammatic Monte Carlo study of the acoustic and the BEC polaron
Jonas Vlietinck, Wim Casteels, Kris Van Houcke +3
We consider two large polaron systems that are described by a Fröhlich type of Hamiltonian, namely the Bose-Einstein condensate (BEC) polaron in the continuum and the acoustic pola…
Diagrammatic Monte Carlo study of the Fermi polaron in two dimensions
Jonas Vlietinck, Jan Ryckebusch, Kris Van Houcke
We study the properties of the two-dimensional Fermi polaron model in which an impurity attractively interacts with a Fermi sea of particles in the zero-range limit. We use a diagr…
Diagrammatic Monte Carlo algorithm for the resonant Fermi gas
K. Van Houcke, F. Werner, T. Ohgoe +2
We provide a description of a diagrammatic Monte Carlo algorithm for the resonant Fermi gas in the normal phase. Details are given on diagrammatic framework, Monte Carlo moves, and…
Contact and Momentum Distribution of the Unitary Fermi Gas
R. Rossi, T. Ohgoe, E. Kozik +4
A key quantity in strongly-interacting resonant Fermi gases is the contact , which characterizes numerous properties such as the momentum distribution at large momenta…
Quasiparticle properties of an impurity in a Fermi gas
Jonas Vlietinck, Jan Ryckebusch, Kris Van Houcke
We report on a study of a spin-down impurity strongly coupled to a spin-up Fermi sea (a so-called Fermi polaron) with the diagrammatic Monte-Carlo (DiagMC) technique. Conditions of…
Feynman diagrams versus Fermi-gas Feynman emulator
K. Van Houcke, F. Werner, E. Kozik +7
Precise understanding of strongly interacting fermions, from electrons in modern materials to nuclear matter, presents a major goal in modern physics. However, the theoretical desc…
Diagrammatic Monte Carlo for Correlated Fermions
E. Kozik, K. Van Houcke, E. Gull +4
We show that Monte Carlo sampling of the Feynman diagrammatic series (DiagMC) can be used for tackling hard fermionic quantum many-body problems in the thermodynamic limit by prese…
Diagrammatic Monte Carlo
Kris Van Houcke, Evgeny Kozik, Nikolay Prokof'ev +1
Diagrammatic Monte Carlo (DiagMC) is a numeric technique that allows one to calculate quantities specified in terms of diagrammatic expansions, the latter being a standard tool of…
Temperature changes when adiabatically ramping up an optical lattice
Lode Pollet, Corinna Kollath, Kris Van Houcke +1
When atoms are loaded into an optical lattice, the process of gradually turning on the lattice is almost adiabatic. In this paper we investigate how the temperature changes when go…
Effect of a Zeeman field on the superconductor-ferromagnet transition in metallic grains
S. Schmidt, Y. Alhassid, K. Van Houcke
We investigate the competition between pairing correlations and ferromagnetism in small metallic grains in the presence of a Zeeman field. Our analysis is based on the universal Ha…