Dresden 2020 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 22: Quantum Dots, Quantum Wires, Point Contacts

TT 22.6: Vortrag

Dienstag, 17. März 2020, 10:45–11:00, HSZ 201

Spin interference effects in quantum rings in the presence of SU(2) fieldsAlberto Hijano1,2,3 and •Dario Bercioux3,41University 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 — 4IKERBASQUE, Basque Foundation of Science, 48011 Bilbao, Spain

We present a theory for quantum transport in quantum networks that accounts for Rashba spin-orbit coupling (SOC) and an in-plane magnetic field, the theory is based on a generalization of previous works with only Rashba SOC [1,2]. We investigate the conductance of polygonal structures as square and rings with symmetric contacts so as studied experimentally in the group of Nitta at Tohoku University. For the case of rings our approach is in agreement with the experimental finding [3]. Additionally, for the case of the square [4], we find interesting results when the in-plane magnetic field is parallel to two of the links for the network. Specifically, along this direction, the magnetic field erases the spin-precession effect due to the Rashba spin-orbit coupling, similarly to the case of systems where the Rashba and the Dresselhaus SOCs have the same strengths.
[1] Bercioux et al., Phys. Rev. Lett. 93, 056802 (2004).
[2] Bercioux et al., Phys. Rev. B 72, 113310 (2005).
[3] Nagasawa et al., Nat. Comm. 4, 2526 (2013).
[4] Wang et al., arXiv:1908:01825 (2019).

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