
VOLUME 94  ISSUE 3 
PAGE 240

Crossovers between superconducting symmetry classes

V. A. Koziy, M. A. Skvortsov
L.D. Landau Institute for Theoretical Physics, 142432 Chernogolovka, Russia Moscow Institute of Physics and Technology, 141700 Moscow, Russia

Abstract
We study the average density of states in a small metallic grain
coupled to two superconductors with the phase difference π,
in a magnetic field. The spectrum of the lowenergy excitations
in the grain is described by the random matrix theory whose symmetry
depends on the magnetic field strength and coupling to the
superconductors.
In the limiting cases,
a pure superconducting symmetry class is realized.
For intermediate magnetic fields or couplings
to the superconductors, the system experiences a crossover
between different symmetry classes. With the help of the supersymmetric
σmodel we derive the exact expressions for the average density
of states in the crossovers between the symmetry classes AC and CIC.


Download PS file (GZipped, 181K)

Download PDF file (248.1K)


Список работ, цитирующих данную статью, см. здесь.
List of articles citing this article can be found here.

