Thursday, June 27, 2013

1306.6229 (Philippe Nozières)

Time crystals: can diamagnetic currents drive a charge density wave into

Philippe Nozières
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.
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