Berlin 2005 – wissenschaftliches Programm
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DY: Dynamik und Statistische Physik
DY 34: Poster
DY 34.58: Poster
Montag, 7. März 2005, 15:30–18:00, Poster TU D
Phase transitions of model colloids and quantum disks in external potentials — •Peter Nielaba1, Wolfram Strepp1, and Surajit Sengupta2 — 1Physics Department, University of Konstanz, Fach M691, 78457 Konstanz, Germany — 2S.N. Bose National Centre for Basic Sciences, Block JD, Sector III, Salt Lake, Calcutta 700098, India
Systems of model colloids in a spatially periodic external potential show rich phase diagrams, including laser-induced freezing (LIF) and melting (LIM). We use finite size scaling analyses of the order parameter and its cumulants in order to map the phase diagrams, from which the width of the freezing- and reentrance region is calculated. The effect of the finite particle mass on the phase diagram is computed by path integral Monte Carlo (PIMC). Qualitatively new features like the direct “quantum melting” from an ordered solid structure to a modulated liquid by increasing external field amplitude are predicted, in contrast to the behaviour of purely classical systems.