Dresden 2017 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 44: Statistical Physics (general)

DY 44.7: Vortrag

Donnerstag, 23. März 2017, 11:45–12:00, ZEU 147

Domain wall dimers in a lattice of half vortices — •Beñat Mencia Uranga and Austen Lamacraft — Theory of condensed matter, University of Cambridge, UK

We study the thermodynamics of a lattice of half vortices and strings. The response of a superfluid to mechanical rotation demonstrates one of the most remarkable features of these systems. Rather than rotate like a classical fluid, a superfluid will instead nucleate quantised vortices which carry angular momentum. In the limit of many vortices, a vortex lattice will form. Depending on the type of superfluid and the experimental parameters, different kinds of vortices can be found as the equilibrium configuration of the rotating superfluid: integer vortices and half vortices. In the half vortex lattice with the presence of an easy-axis anisotropy, a state which is phenomenologically equivalent to having strings with finite tension pairing up half vortices arises. Hence, we develop a description of the system based on interacting point vortices and strings.