Bose statistics, crystallization and quantum jamming

Datum

28.03.2012

Zeit

16:30 - 18:00

Sprecher

Massimo Boninsegni

Zugehörigkeit

University of Alberta

Sprache

en

Hauptthema

Physik

Andere Themen

Physik

Host

Seminar Quantum Dynamics

Beschreibung

Indistinguishability of particles plays a major role in destabilizing crystalline order in Bose systems. In this talk, this effect will be semi-quantitatively described in terms of damped quasi-particle modes, and illustrated in the dual language of Feynman paths. A robust confirmation of this prediction is provided by means of first-principle simulations of dipolar bosons and bulk condensed helium-four. Two major implications are that a) contrary to conventional wisdom, zero-point motion alone cannot prevent helium-four crystallization at low temperature, at saturated vapour pressure, and b) Bose statistics leads to quantum jamming at finite temperature, dramatically enhancing the metastability of superfluid glasses. Only theoretical studies in which quantum statistics is fully included can reliably address these issues.

Letztmalig verändert: 28.03.2012, 09:36:33