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Characterization of Spin-Orbit Interactions of GaAs Heavy Holes Using a Quantum Point Contact

Nichele, Fabrizio and Chesi, Stefano and Hennel, Szymon and Wittmann, Angela and Gerl, Christian and Wegscheider, Werner and Loss, Daniel and Ihn, Thomas and Ensslin, Klaus. (2014) Characterization of Spin-Orbit Interactions of GaAs Heavy Holes Using a Quantum Point Contact. Physical Review Letters, 113 (4). 046801.

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Official URL: http://edoc.unibas.ch/dok/A6348186

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Abstract

We present transport experiments performed in high-quality quantum point contacts embedded in a GaAs two-dimensional hole gas. The strong spin-orbit interaction results in peculiar transport phenomena, including the previously observed anisotropic Zeeman splitting and level-dependent effective g factors. Here we find additional effects, namely, the crossing and the anticrossing of spin-split levels depending on subband index and magnetic field direction. Our experimental observations are reconciled in a heavy-hole effective spin-orbit Hamiltonian where cubic- and quadratic-in-momentum terms appear. The spin-orbit components, being of great importance for quantum computing applications, are characterized in terms of magnitude and spin structure. In light of our results, we explain the level-dependent effective g factor in an in-plane field. Through a tilted magnetic field analysis, we show that the quantum point contact out-of-plane g factor saturates around the predicted 7.2 bulk value.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Theoretische Physik Mesoscopics (Loss)
UniBasel Contributors:Loss, Daniel
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:American Physical Society
ISSN:0031-9007
e-ISSN:1079-7114
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:05 Apr 2022 14:44
Deposited On:10 Apr 2015 09:12

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