SKM 2021 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 19: Transport (joint session TT/DY)
DY 19.3: Vortrag
Freitag, 1. Oktober 2021, 14:00–14:15, H6
Spin interference effects in quantum rings in the presence of SU(2) fields — Alberto Hijano1,2,3, Tineke van den Berg3, Diego Frustaglia4, and •Dario Bercioux3,5 — 1University of the Basque Country, UPV/EHU, Bilbao, Spain — 2Centro de Física de Materiales (CFM-MPC) Centro Mixto CSIC-UPV/EHU, E-20018 Donostia-San Sebastián, Spain — 3Donostia International Physics Center, Paseo Manuel de Lardizbal 4, E-20018 San Sebastián, Spain — 4Departamento de Física Aplicada II, Universidad de Sevilla, E-41012 Sevilla, Spain — 5IKERBASQUE, Basque Foundation of Science, 48011 Bilbao, Spain
We present a theory of conducting quantum networks that accounts for Abelian and non-Abelian fields acting on spin carriers [1]. We apply this approach to model the conductance of mesoscopic spin interferometers of different geometry (such as squares and rings), reproducing recent experimental findings in nanostructured InAsGa quantum wells subject to Rashba spin-orbit and Zeeman fields [2,3] (as, e.g., the manipulation of Aharonov-Casher interference patterns by geometric means). Moreover, by introducing an additional field-texture engineering, we manage to single out a previously unnoticed spin-phase suppression mechanism. Our approach can also be used for the study of complex networks and the spectral properties of closed systems.
[1] Hijano et al., Phys. Rev. B 103, 155419 (2021)
[2] Nagasawa, et al., Nat. Commun. 4, 2526 (2013)
[3] Wang et al., Phys. Rev. Lett. 123, 266804 (2019)