Seminarium om teoretisk fysik – Wilhelm Zwerger

Wilhelm Zwerger: Superfluid Liquid Crystals and Supersolids

Abstract

The talk will provide an introduction to the concept of supersolids. Generically, this requires a finite density of defects in the ground state, as first suggested by Andreev and Lifshitz. As a concrete example we discuss dipolar gases and show that the transition to the supersolid phase is of first order, preempting the standard  roton instability. A general hydrodynamic theory is presented for supersolids  with a density modulation along a single direction. It displays two propagating  modes associated with the two Independent broken continuous symmetries.  One of them describes the ballistic propagation of defects, thus generalizing the diffusive permeation mode of classical smectic-A liquid crystals.

Seminariet hålls i hybridform

Det går både att delta i seminariet på plats eller via Zoom.

Plats: PJ-salen, Institutionen för fysik, Kemigården 1, Göteborg
Zoom-länk: https://gu-se.zoom.us/j/68654155504

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Seminarium om teoretisk fysik