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EPL
Volume 103, Issue 5, Pages -Publisher
EPL ASSOCIATION, EUROPEAN PHYSICAL SOCIETY
DOI: 10.1209/0295-5075/103/57008
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It has been recently argued that an inhomogeneous system could rotate spontaneously in its ground state - hence a time crystal which is periodic in time. In this letter we present a very simple example: a superfluid ring threaded by a magnetic field which develops a charge density wave (CDW). A simple calculation shows that diamagnetic currents cannot drive rotation of the CDW, with a clear picture of the cancellation mechanism. editor's choice Copyright (C) EPLA, 2013
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