Zeeman ratchets for ballistic spin currents

URN to cite this document:: urn:nbn:de:bvb:355-epub-18445
DOI to cite this document:: 10.5283/epub.1844

Scheid, Matthias ; Wimmer, Michael ; Bercioux, Dario ; Richter, Klaus

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Date of publication of this fulltext: 05 Aug 2009 13:33

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Abstract

We investigate the possiblity of creating directed spin-polarized currents in a two-dimensional electron gas (2DEG) subject to an asymmetric magnetic field and an external adiabatic driving. We thereby generalize concepts of quantum charge ratchets to the case with spin. Due to the Zeeman term in the Hamiltonian, spin-up and -down electrons experience different effective potentials, which can be ...