2013/06/26 by Philippe Nozières · 3 citations
Physics and Astronomy · #cond-mat.other #cond-mat.quant-gas #quant-ph
paper · pdf · doi:10.1209/0295-5075/103/57008
5 pages
arxiv created 2013/06/26 · arxiv updated 2015/06/16
It has been argued recently that an inhomogeneous system could rotate spontaneously in its ground state - hence a 'time crystal' which is periodic in time. In this note we present a very simple example: a superfluid ring threaded by a magnetic field which develops a charge density wave (CDW). A naive calculation shows that diamagnetic currents cannot drive rotation of the CDW, with a clear picture of the cancellation mechanism.