The Phase in a Quantum-Dot Interferometer Modulated by Rashba Spin-Orbit Interaction
Keywords:
Aharonov-Bohm Phase; transmission phase; quantum dot; Rashba spin-orbit interactionAbstract
Considering Rashba spin-orbit interaction (SOI) in a interferometer with a quantum dot (QD), the phase for spin-polarized electrons transport through QD is systemically studied. The results show that, due to the presence of SOI, the spin-polarized electrons no longer obey the Onsager symmetry: neither of the up-spin and down-spin σ ≠ G σ ( − ϕ ) conductances are the even functions as magnetic flux, i.e. . Moreover, the Aharonov-Bohm AB phase difference between up-spin and down-spin electrons is proportional to the spin
precession angle. In contrast to this, the transmission phase for up-spin and down-spin electrons traversing the quantum dot
presents similar behaviors, which continuously increase by π as the energy of the dot level is tuned through a resonance, and
presents a phase lapse accompanying transmission zero. These novel phenomena may be originated from the intrinsic effect of
electric field on electron transport.
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