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Condensed Matter > Mesoscale and Nanoscale Physics
Title: Spin polarization induced by decoherence in a tunneling one-dimensional Rashba model
(Submitted on 5 Jan 2023 (v1), last revised 3 Apr 2023 (this version, v3))
Abstract: Basic questions on the nature of spin polarization in two terminal systems and the way in which decoherence breaks Time-Reversal Symmetry (TRS) are analyzed. We exactly solve several one-dimensional models of tunneling electrons and show the interplay of spin precession and decay of the wavefunction in either a U(1) magnetic field or an effective Spin-Orbit (SO) magnetic field. Spin polarization is clearly identified as the emergence of a spin component parallel to either magnetic field. We show that Onsager's reciprocity is fulfilled when time reversal symmetry is present and no spin polarization arises, no matter the barrier parameters or the SO strength. Introducing a Buttiker's decoherence probe, that preserves unitarity of time evolution, we show that breaking of TRS results in a strong spin polarization for realistic SO, and barrier strengths. We discuss the significance of these results as a very general scenario for the onset of the Chiral-Induced Spin Selectivity effect (CISS), now possibly matching experiments in a quantitative manner.
Submission history
From: Bertrand Berche [view email][v1] Thu, 5 Jan 2023 17:06:13 GMT (715kb,D)
[v2] Fri, 24 Feb 2023 15:09:28 GMT (1185kb,D)
[v3] Mon, 3 Apr 2023 16:05:34 GMT (1187kb,D)
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