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- Title
BCS Instability of a Two-Layer System of Composite Fermions.
- Authors
Lozovik, Yu. E.; Ovchinnikov, I.V.
- Abstract
Pairing instability is considered for a two-layer electron system in a strong magnetic field with an even-fractional filling ν = 1/(2m)(m is an integer) of the lowest Landau level in each of the layers. The limit of large distance d between the layers is analyzed. Microscopic analysis is carried out in the eikonal approximation in the composite-fermion formalism. It is found that the condition for pairing instability in this model is independent of d. Due to the marginal character of the composite-fermion system, pairing instability in the particle–particle (BCS) channel arises only for η < 2 or η = 2, but Mv[sub 0] > 43, where η and v[sub 0] are the parameters of the assumed electron–electron interaction, v ∝v[sub 0]/r[sup η], and M is the band electron mass. In the particle–hole (isospin density wave) channel, instability is not observed. © 2004 MAIK “Nauka / Interperiodica”.
- Subjects
ELECTRONS; FERMIONS; EIKONAL equation; MAGNETIC fields; LANDAU levels; PHYSICS
- Publication
JETP Letters, 2004, Vol 79, Issue 2, p76
- ISSN
0021-3640
- Publication type
Article
- DOI
10.1134/1.1690355