title: Spin degeneracy and conductance fluctuations in open quantum dots.
abstract: 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.
authors: Department of Physics, Stanford University, Stanford, California 94305, USA.
authors: J A
authors: JA
authors: Folk
authors: S R
authors: SR
authors: Patel
authors: K M
authors: KM
authors: Birnbaum
authors: C M
authors: CM
authors: Marcus
authors: C I
authors: CI
authors: Duruöz
authors: J S
authors: JS
authors: Harris