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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Symmetry breaking of the persistent spin helix in quantum transport

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Author(s):
Weigele, Pirmin J. [1] ; Marinescu, D. C. [2] ; Dettwiler, Florian [1] ; Fu, Jiyong [3] ; Mack, Shawn [4] ; Egues, J. Carlos [5] ; Awschalom, David D. [6] ; Zumbuehl, Dominik M. [1]
Total Authors: 8
Affiliation:
[1] Univ Basel, Dept Phys, CH-4056 Basel - Switzerland
[2] Clemson Univ, Dept Phys & Astron, Clemson, SC 29634 - USA
[3] Qufu Normal Univ, Dept Phys, Qufu 273165, Shandong - Peoples R China
[4] US Naval Res Lab, Washington, DC 20375 - USA
[5] Univ Sao Paulo, Inst Fis Sao Carlos, BR-13560970 Sao Carlos, SP - Brazil
[6] Univ Chicago, Inst Mol Engn, Chicago, IL 60637 - USA
Total Affiliations: 6
Document type: Journal article
Source: Physical Review B; v. 101, n. 3 JAN 16 2020.
Web of Science Citations: 0
Abstract

We exploit the high-symmetry persistent spin helix state obtained for similar Rashba and linear Dresselhaus interactions in a quantum well to revisit the weak localization problem within a perturbative approach in a Landau level formulation. We define the small parameter of the theory as the deviation from the symmetry state introduced by the mismatch of the linear terms and by the strength of the cubic Dresselhaus term. In the vicinity of the helix state, the SO field becomes uniaxial, offering a natural direction of spin quantization, thus defining the z axis within the 2D plane. In contrast to previous theories, this reveals a full decoupling of the Cooperon triplet scattering modes as well as decoupled Landau levels, to lowest order in the small parameter. This makes it possible to derive a closed-form expression for the weak localization magnetoconductivity, thus providing a new paradigm of localization in the weakly-broken spin symmetry regime. We perform quantum transport experiments in GaAs quantum wells, finding very good agreement with the new theory. We present a reliable two-step method to extract the SO and transport parameters from fits of the new expression, obtaining excellent agreement with recent experiments. This is an important step towards engineering and controlling the spin-orbit interaction as a powerful resource in emerging quantum technologies. (AU)

FAPESP's process: 16/50200-4 - Quantum correction to the conductivity of 2D electron gases near the Rashba-Dresselhaus SU(2) sysmmetry point
Grantee:José Carlos Egues de Menezes
Support type: Regular Research Grants
FAPESP's process: 16/08468-0 - Topological insulators and Majorana fermions
Grantee:José Carlos Egues de Menezes
Support type: Regular Research Grants