| Issue |
EPL
Volume 103, Number 5, September 2013
|
|
|---|---|---|
| Article Number | 57008 | |
| Number of page(s) | 3 | |
| Section | Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties | |
| DOI | https://doi.org/10.1209/0295-5075/103/57008 | |
| Published online | 24 September 2013 | |
Time crystals: Can diamagnetic currents drive a charge density wave into rotation?
Institut Laue Langevin - BP 156, F-38042 Grenoble Cedex 9, France, EU
Received: 18 July 2013
Accepted: 26 August 2013
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.
PACS: 75.20.-g – Diamagnetism, paramagnetism, and superparamagnetism / 72.15.Nj – Collective modes (e.g., in one-dimensional conductors)
© EPLA, 2013
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