Towards a dephasing diode: asymmetric and geometric dephasing

Details Towards a dephasing diode: asymmetric and geometric dephasing Towards a dephasing diode: asymmetric and geometric dephasing

2007-09-10

arxiv.org/abs/0709.1381v2

Phys. Rev. Lett. 100, 126806 (2008)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages (2 fig) v2: extensive improvements to "readability" & references added

Scientific paper

10.1103/PhysRevLett.100.126806

We study the effect of a noisy environment on spin and charge transport in ballistic quantum wires with spin-orbit coupling (Rashba coupling). We find that the wire then acts as a ``dephasing diode'', inducing very different dephasing of the spins of right and left movers. We also show how Berry phase (geometric phase) in a curved wire can induce such asymmetric dephasing, in addition to purely geometric dephasing. We propose ways to measure these effects through spin detectors, spin-echo techniques, and Aharanov-Bohm interferometry.

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