Spin‐decoherence effects on the pumped spin‐dependent transport through a quantum dot

Abstract

AbstractWe theoretically study the spin‐decoherence effects on the pumped spin‐polarized current through a quantum dot subject to a rotating magnetic field and coupled to two ferromagnetic electrodes. The dependence of the current on the magnetic moment orientation angle of the two leads is greatly influenced by the spin pump and the spin decoherence. The spin pump destroys the normal spin‐valve effects, and the spin decoherence makes the current exhibiting a quite complicated angle dependence. These distinct transport behaviors can be used as electrical schemes for detection of electron spin resonance and spin decoherence. Moreover, the current is closely related to the magnetic Rabi frequency and the detuning, in which the spin decoherence also plays an important role, and thus the pumped spin‐polarized current can be used as a sensitive tool to measure these pumping parameters. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)