Anticrossing of spin-split subbands in quasi-one-dimensional wires.
In quantum Hall systems, both anticrossings and magnetic phase transitions can occur when opposite-spin Landau levels coincide. Our results indicate that both processes are also possible in quasi-1D quantum wires in an in-plane B field, Bparallel. Crossings of opposite-spin 1D subbands resemble magnetic phase transitions at zero dc source-drain bias, but display anticrossings at high dc bias. Our data also imply that the well-known 0.7 structure may evolve into a spin-hybridized state in finite dc bias.
Graham
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Cavendish Laboratory, J. J. Thomson Avenue, Cambridge, CB3 OHE, United Kingdom.
Simmons
M Y
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Ritchie
D A
DA
Pepper
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