Spin degeneracy and conductance fluctuations in open quantum dots.
The dependence of conductance fluctuations on parallel magnetic field is used as a probe of spin degeneracy in open GaAs quantum dots. The variance of fluctuations at high parallel field is reduced from the low-field variance (with broken time-reversal symmetry) by factors ranging from roughly 2 in a 1 microm (2) dot to greater than 4 in 8 microm (2) dots. The factor of 2 is expected for Zeeman splitting of spin-degenerate channels. A possible explanation for the larger suppression based on field-dependent spin-orbit scattering is proposed.
Folk
J A
JA
Department of Physics, Stanford University, Stanford, California 94305, USA.
Patel
S R
SR
Birnbaum
K M
KM
Marcus
C M
CM
Duruöz
C I
CI
Harris
J S
JS