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.
@article{arxiv.cond-mat/0702177,
title = {Anomalous spin-dependent behaviour of one-dimensional subbands},
author = {A. C. Graham and M. Pepper and M. Y. Simmons and D. A. Ritchie},
journal= {arXiv preprint arXiv:cond-mat/0702177},
year = {2007}
}