Kiel 2011 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 18: Poster: Theorie/Simulation dichter und stark gekoppelter Plasmen
P 18.5: Poster
Mittwoch, 30. März 2011, 16:30–18:30, Foyer
Correlation Effects and Phase Transitions in Mass-Asymmetric Electron-Hole Bilayers — •Jens Schleede1, Alexey Filinov2, Michael Bonitz2, and Holger Fehske1 — 1Institute for Physics, Ernst-Moritz-Arndt Universität, Greifswald, Germany — 2Institute for Theoretical Physics and Astrophysics, Christian-Albrechts-Universität, Kiel, Germany
We investigate the structural phase transition in two-dimensional mass-asymmetric electron-hole bilayer systems [1,2]. By using path integral Monte Carlo simulations, Coulomb correlations and quantum effects are treated on first princples. The bilayer systems show a variety of possible phases, e.g. exciton solid and gas, electron-hole liquid and hole crystal plus electron gas. For different layer separations, particle densities and temperatures we analyze the bond-angular and translational order correlation functions, the defect densities and the static structure factor. By means of these quantities we can determine the type of the phase transitions and whether there is an intermediate hexatic phase between the solid and the fluid phase. Furthermore the magnitude and phase of the complex angular bond-order parameter allows us to visualize the fragmentation of the solid into crystallite domains near the melting point [3].
[1] P. Ludwig et al., Contrib. Plasma Phys. 47, 335 (2007).
[2] S. De Palo et al., Phys. Rev. Lett. 88, 206401 (2002).
[3] P. Hartmann et al., Phys. Rev. Lett. 105, 115004 (2010).