Jena 2013 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

P: Fachverband Plasmaphysik

P 5: Laserplasmen und Quantenplasmen

P 5.5: Hauptvortrag

Montag, 25. Februar 2013, 17:45–18:15, HS 3

Excitation spectrum of nonideal quantum systems from first-principle thermodynamic simulations — •Alexey Filinov^1,2 and Michael Bonitz¹ — ¹Institut für Theoretische Physik und Astrophysik, D-24098 Kiel, Germany — ²Joint Institute for High Temperatures RAS, 125412 Moscow, Russia

In our talk we review the numerical schemes to extract information about real-time dynamics of quantum many-body systems from the imaginary-time correlation functions available from quantum Monte Carlo simulations. We discuss reconstruction of the dynamic structure factor S(q,ω) related with the collective density excitations, and the one-particle spectral function extracted from the one-particle Matsubara Green’s function. The performance of the methods is demonstrated on several physical examples, which include superfluid ⁴He [1], quasi-two dimensional dipolar Bose gases [2] and quantum electron-hole bilayers. The used approach allows one to analyze damping and hybridization of the excitation spectra from first principles, and to study temperature-density dependencies. Prospects for degenerate quantum plasmas are discussed.

[1] M. Rossi and et al., Phys. Rev. B 85, 014525 (2012); [2] A. Filinov and M. Bonitz, Phys. Rev. A 86, 043628 (2012).