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Anomalous spin-dependent behaviour of one-dimensional subbands

A. C. Graham·M. Pepper·M. Y. Simmons·D. A. Ritchie
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Abstract

We report a new electron interaction effect in GaAs/AlGaAs quantum wires. Using DC-bias spectroscopy, we show that large and abrupt changes occur to the energies of spin-down (lower energy) states as they populate. The effect is not observed for spin-up energy states. At B=0, interactions have a pronounced effect, in the form of the well-known 0.7 Structure. However, our new results show that interactions strongly affect the energy spectrum at all magnetic fields, from 0 to 16T, not just in the vicinity of the 0.7 Structure.

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A. C. Graham, M. Pepper, M. Y. Simmons, D. A. Ritchie. 2007-02-07. Anomalous spin-dependent behaviour of one-dimensional subbands. https://doi.org/10.1103/physrevb.72.193305

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