Quantum point contact with large localized spin: fractional quantization of the ballistic conductance
I. A. Shelykh, N. G. Galkin, N. T. Bagraev
Abstract
We analyze the conductance of the quantum point contact containing large localized spin J. The additional plateau is formed on a ballistic conductance staircase if only one propagating channel is rendered conducting. The conductance value at this plateau is shown to depend strongly on J and decrease from 3e2/2h to e2/h when J increases from 1/2 to infinity, which is in a good agreement with the experimental observations [D.J. Reilly, et al, Phys. Rev. B 63, 121311 (2001)].
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