Bulletin of the American Physical Society
APS March Meeting 2020
Volume 65, Number 1
Monday–Friday, March 2–6, 2020; Denver, Colorado
Session J43: Precision Many-Body Physics V: Dynamics and Finite Temperature Properties
2:30 PM–5:30 PM,
Tuesday, March 3, 2020
Sponsoring Units: DCOMP DAMOP DCMP
Chair: Thomas Schaefer, Ecole Polytechnique
Abstract: J43.00006 : A generic quantum Monte Carlo approach for electronic correlations in out-of-equilibrium systems.
(Univ. Grenoble Alpes, CNRS, Institut Néel, F-38000 Grenoble, France)
(Univ. Grenoble Alpes, CEA, IRIG-PHELIQS, GT F-38000 Grenoble, France)
interacting many-body quantum systems, building upon the standard perturbative
expansion in the Coulomb interaction. High order series are derived from a
determinantal diagrammatic Quantum Monte Carlo in the real time Keldysh
Such an algorithm was already designed by Profumo at al. (PRB, 91 245154 (2015))
and can compute perturbation series for single quantities after an arbitrary
long (real) time evolution . We improved it to compute an entire time-dependent
function in a single run. With a similar sampling method and computation
time, the new algorithm gather much more information and give access to
dynamical quantities directly in real frequencies.
The algorithm has been tested on the Anderson impurity model at equilibrium,
and applied to the same system driven out of equilibrium by a bias voltage. In
these systems, we obtained 10 orders of the Green's function
perturbation series. To reach the non-perturbative regime, we developed a
robust resummation scheme based on conformal transforms of the complex plane in
the perturbation parameter.
The American Physical Society (APS) is a non-profit membership organization working to advance the knowledge of physics.
1 Physics Ellipse, College Park, MD 20740-3844
Editorial Office 1 Research Road, Ridge, NY 11961-2701 (631) 591-4000
Office of Public Affairs 529 14th St NW, Suite 1050, Washington, D.C. 20045-2001 (202) 662-8700