Journal
JOURNAL OF PHYSICS-CONDENSED MATTER
Volume 20, Issue 16, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0953-8984/20/16/164213
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Funding
- EPSRC [EP/D008506/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/D008506/1] Funding Source: researchfish
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We review the progress in the study of the 0.7 structure, a many-body spin effect observed in GaAs quantum wires. Electrical and thermal measurements show that the 0.7 structure is characterized by a spontaneous spin splitting which causes the spin-up subband to stay near the electrochemical potential as the channel is populated. The 0.7 structure is not an isolated phenomenon but is the first in a series of effects that occur whenever opposite spin subbands are degenerate in energy. Bias spectroscopy shows how the levels move with increasing source - drain bias as the 0.7 structure evolves into a structure near 0.85(2e(2)/h). Our measurements do not support a Kondo effect from a single bound state in the channel as a possible explanation of the 0.7 structure.
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