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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.)

g-Factor Anisotropy Inversion in InGaAs 2D Nanostructures

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Author(s):
Leon Padilla, Jhon Elber [1] ; Toloza Sandoval, Marcelo Alejandro [1] ; da Silva, Antonio Ferreira [1] ; de Andrada e Silva, Erasmo Assumpcao [2] ; La Rocca, Giuseppe Carlo [3, 4]
Total Authors: 5
Affiliation:
[1] Univ Fed Bahia, Inst Fis, BR-40210340 Salvador, BA - Brazil
[2] Inst Nacl Pesquisas Espaciais, BR-12201970 Sao Jose Dos Campos, SP - Brazil
[3] Scuola Normale Super Pisa, Piazza Cavalieri 7, I-56126 Pisa - Italy
[4] CNISM, Piazza Cavalieri 7, I-56126 Pisa - Italy
Total Affiliations: 4
Document type: Journal article
Source: PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS; v. 256, n. 6, SI JUN 2019.
Web of Science Citations: 0
Abstract

The inversion or sign change of the electron g-factor anisotropy in thin-layer semiconductor nanostructures is investigated theoretically and gauged for InGaAs asymmetric single and double quantum wells (QWs). The g-factor anisotropy in these 2D nanostructures is given by the difference between the longitudinal and transverse components; it is a fine sensor of the confining potential and in InGaAs structures it is determined by the Rashba spin orbit coupling. In the presence of structure inversion asymmetry (SIA) the g-factor anisotropy is expected to invert at a critical well width. This effect can be useful technologically and is here analyzed in detail with InGaAs/InP asymmetric multi-layer structures. The g-factor anisotropy in these structures is calculated in a fine grid around the inversion point, using 8-band kp Kane model based envelope function theory for the nanostructure, and perturbation theory for the calculation of the effective g factor. It is shown that the anisotropy inversion can be seen only in asymmetric structures with very thin layers, near the limit of no bound states allowed, and corresponding to the electron being pushed out of the confining region. The inversion point, or critical well width for the g-factor anisotropy inversion in Insulator/InGaAs/InP QWs is determined to be approximate to 4nm. For double or coupled QWs it is found that the inversion can be observed only with very thin tunneling barriers around 1 nm wide. (AU)

FAPESP's process: 16/03854-9 - Spin-orbit interaction in semiconductor nanostructures and topological insulators
Grantee:Erasmo Assumpção de Andrada e Silva
Support type: Regular Research Grants