Entropy driven formation of a half-quantum vortex lattice
Abstract
Half-quantum vortices (HQVs) can exist in a superconductor or superfluid with an exact or approximate U(1) \times U(1) symmetry, for instance in spinor condensates, 3He-A, Sr2RuO4, and possibly cuprate superconductors with stripe order. In this paper, we show that a lattice of HQVs can be stabilized at finite temperature even when it does not have lower energy than the lattice of full vortices at T = 0 since there is a gain in configurational entropy when a full vortex fractionalizes into a pair of HQVs. Specifically, the lattice of HQVs has an optical branch of phonon modes absent in the lattice of full vortices. Moreover, the HQV lattice at T > 0 can have a different structure than the HQV lattice at T = 0.
Cite
@article{arxiv.1009.5719,
title = {Entropy driven formation of a half-quantum vortex lattice},
author = {Suk Bum Chung and Steven A. Kivelson},
journal= {arXiv preprint arXiv:1009.5719},
year = {2015}
}
Comments
12 pages, 2 figures; published version