Conductance anomaly and Zeeman splitting in ballistic hole quantum wires

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• Dr. Romain Danneau (School of Physics, University of New South Wales, Sydney, Australia)
• Monday 12 June 2006, 14:15-15:15
• Mott Seminar Room, Cavendish Laboratory, Department of Physics.

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I will present a study of the Zeeman splitting in ballistic hole quantum wires formed in a (311)A quantum well by surface gate confinement. Transport measurements clearly show lifting of the spin degeneracy and crossings of the subbands when an in-plane magnetic field B is applied parallel to the wire. When B is oriented perpendicular to the wire, no spin-splitting is discernible up to B = 8.8 T. This anisotropic behavior is also measured for the 0.7 structure and the zero bias anomaly. The observed large Zeeman splitting anisotropy in our hole quantum wires demonstrates the importance of quantum-confinement for spin-splitting in nanostructures with strong spin-orbit coupling.

This talk is part of the Semiconductor Physics series.

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