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...

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Published inPhysical review letters Vol. 86; no. 10; p. 2102
Main Authors Folk, J A, Patel, S R, Birnbaum, K M, Marcus, C M, Duruöz, C I, Harris, Jr, J S
Format Journal Article
LanguageEnglish
Published United States 05.03.2001
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Summary: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.
ISSN:0031-9007
DOI:10.1103/PhysRevLett.86.2102