Interference as a probe of spin incoherence in strongly interacting quantum wires.
We show that interference experiments can be used to identify the spin-incoherent regime of strongly interacting one-dimensional conductors. Two qualitative signatures of spin incoherence are found: a strong magnetic field dependence of the interference contrast and an anomalous scaling of the interference contrast with the applied voltage, with a temperature and magnetic field dependent scaling exponent. The experiments distinguish the spin-incoherent from the spin-polarized regime, and so may be useful in deciding between alternative explanations proposed for the anomalous conductance quantization observed in quantum point contacts and quantum wires at low density.
Kindermann
M
M
Laboratory of Atomic and Solid State Physics, Cornell University, Ithaca, New York 14853, USA.
Brouwer
P W
PW
Millis
A J
AJ