https://doi.org/10.1007/s100510050197
Mesoscopic charge density wave in a magnetic flux
Laboratoire de Physique des Solides, associé au
CNRS, Université Paris-Sud, 91405 Orsay, France
Corresponding author: a gilles@lps.u-psud.fr
Received:
16
September
1997
Revised:
12
November
1997
Accepted:
13
November
1997
Published online: 15 February 1998
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 ξ, 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)
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 1998
