Abstract
We review the progress in the study of the 0.7 structure, a many-body spin effect observedin GaAs quantum wires. Electrical and thermal measurements show that the 0.7 structureis characterized by a spontaneous spin splitting which causes the spin-up subband to staynear the electrochemical potential as the channel is populated. The 0.7 structure is not anisolated phenomenon but is the first in a series of effects that occur whenever opposite spinsubbands are degenerate in energy. Bias spectroscopy shows how the levels move withincreasing source–drain bias as the 0.7 structure evolves into a structure near0.85(2e2/h). Our measurements do not support a Kondo effect from a single bound state in thechannel as a possible explanation of the 0.7 structure.
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