SKM 2023 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 60: Quantum Dots, Quantum Wires, Point Contacts

TT 60.1: Vortrag

Donnerstag, 30. März 2023, 17:15–17:30, HSZ 03

Spin-texture topology in curved circuits driven by spin-orbit interactions — Alberto Hijano^1,2, Eusebio J. Rodríguez³, •Dario Bercioux^4,5, and Diego Frustaglia³ — ¹Centro de Física de Materiales (CFM-MPC) Centro Mixto CSIC-UPV/EHU, E-20018 Donostia-San Sebastián, Spain — ²Department of Condensed Matter Physics, University of the Basque Country UPV/EHU, 48080 Bilbao, Spain — ³Departamento de Física Aplicada II, Universidad de Sevilla, E-41012 Sevilla, Spain — ⁴Donostia International Physics Center (DIPC), 20018 Donostia–San Sebastián, Spain — ⁵IKERBASQUE, Basque Foundation for Science, Plaza Euskadi 548009 Bilbao, Spain

We study the response of spin carriers to the effective field textures developed in curved one-dimensional circuits subject to the joint action of Rashba and Dresselhaus spin-orbit interactions. By using a quantum network technique, we establish that the interplay between these two non-Abelian fields and the circuit’s geometry modify the geometrical characteristics of the spinors, particularly on square circuits, leading to the localisation of the electronic wave function and the suppression of the quantum conductance. We propose a topological interpretation by classifying the corresponding spin textures in terms of winding numbers.
[1] A. Hijano el al., arXiv:2209.11653 [cond-mat.mes-hall]