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P: Fachverband Plasmaphysik

P 9: Theory and Modelling I

P 9.1: Hauptvortrag

Dienstag, 1. März 2016, 14:30–15:00, b305

Computer simulations of correlated fermions–from quantum plasmas to ultracold atoms and plasma-surface interaction — •Michael Bonitz — ITAP, CAU Kiel

Correlated quantum particles with half-integer spin are of growing interest in many fields, including condensed matter, dense plasmas and ultracold atoms. From a theory point of view these systems are very challenging as they require to simultaneously treat correlation, quantum diffraction and exchange effects. I will present two examples of recent breakthroughs with first-principle computer simulations: 1. Ab initio quantum Monte Carlo results for electrons in Warm Dense Matter in thermodynamic equilibrium. It is possible to avoid the notorious fermion sign problem, without using fixed nodes, for a large range of parameters [1]. 2. Nonequilibrium Green functions results with T-matrix selfenergies for the ultrafast expansion dynamics of strongly correlated fermions on a lattice. We achieve, for the first time, excellent agreement with ultracold atom experiments [2]. Finally, I outline ideas how to accurately treat plasmas in contact with surfaces. Here the new challenge is to interface classical and quantum behavior of electrons.
1. T. Schoof, S. Groth, J. Vorberger, and M. Bonitz, Phys. Rev. Lett. 115, 130402 (2015); 2. N. Schlünzen, S. Hermanns, M. Bonitz, and C. Verdozzi, arXiv:1508.02957