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The European Physical Journal B
ISSN: 1434-6028 (printed version)
ISSN: 1434-6036 (electronic version)
Abstract Volume 1 Issue 3 (1998) pp 377-383
Mesoscopic charge density wave in a magnetic flux
G. Montambaux (a)
Laboratoire de Physique des Solides, associé au CNRS, Université Paris-Sud, 91405 Orsay, France
Received: 16 September 1997 / Received in final form: 12 November 1997 / Accepted: 13 November 1997
Abstract: The stability of a Charge Density Wave (CDW) in a one-dimensional ring pierced by a Aharonov-Bohm flux is studied in a mean-field picture. It is found that the stability depends on the parity of the number N of electrons. When the size of the ring becomes as small as the coherence length $\xi$, the CDW gap increases for even N and decreases for odd N. Then when N is even, the CDW gap decreases with flux but it increases when N is odd. The variation of the BCS ratio with size and flux is also calculated. We derive the harmonics expansion of the persistent current in a presence of a finite gap.
PACS. 71.45 Lr Charge-density-wave systems - 72.15 Gd Galvanomagnetic and other magnetotransport effects - 72.15 Nj Collective modes (e.g., in one-dimensional conductors)
(a) email: gilles@lps.u-psud.fr
Online publication: February 24, 1998
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