0.7 Structure and zero bias anomaly in ballistic hole quantum wires.
We study the anomalous conductance plateau around G=0.7(2e2/h) and the zero bias anomaly in ballistic hole quantum wires with respect to in-plane magnetic fields applied parallel B parallel and perpendicular B perpendicular to the quantum wire. As seen in electron quantum wires, the magnetic fields shift the 0.7 structure down to G=0.5(2e2/h) and simultaneously quench the zero bias anomaly. However, these effects are strongly dependent on the orientation of the magnetic field, owing to the highly anisotropic effective Landé g-factor g* in hole quantum wires. Our results highlight the fundamental role that spin plays in both the 0.7 structure and zero bias anomaly.
Danneau
R
R
School of Physics, University of New South Wales, Sydney 2052, Australia. r.danneau@boojum.hut.fi
Klochan
O
O
Clarke
W R
WR
Ho
L H
LH
Micolich
A P
AP
Simmons
M Y
MY
Hamilton
A R
AR
Pepper
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M
Ritchie
D A
DA