Bulletin of the American Physical Society
APS March Meeting 2021
Volume 66, Number 1
Monday–Friday, March 15–19, 2021; Virtual; Time Zone: Central Daylight Time, USA
Session F59: Electronic Structure: Theory and Spectra
11:30 AM–1:54 PM,
Tuesday, March 16, 2021
Sponsoring
Unit:
FIAP
Chair: Peihong Zhang, State Univ of NY - Buffalo
Abstract: F59.00002 : Spin-orbit coupling in wurtzite quantum wells*
11:42 AM–11:54 AM
Live
Presenter:
Poliana Penteado
(Institute of Physics, Federal University of Uberlândia)
Authors:
Poliana Penteado
(Institute of Physics, Federal University of Uberlândia)
Jiyong Fu
(Department of Physics, Qufu Normal University)
Denis R Candido
(Department of Physics and Astronomy, University of Iowa)
Gerson J. Ferreira
(Institute of Physics, Federal University of Uberlândia)
Diego P. Pires
(Department of Physics, Federal University of Rio Grande do Norte)
Esmerindo Bernardes
(Institute of Physics of São Carlos, University of São Paulo)
Carlos Egues
(Institute of Physics of São Carlos, University of São Paulo)
We take into account the s–pz orbital mixing relevant to wurtzite structures (absent in zincblende). Focusing on QWs, we obtain the usual k-linear Rashba term, and differently from
zincblende structures, a bulk Rashba-type term induced by the inversion asymmetry of the wurtzite lattice. Our
results show this latter term to be the main contribution to the Rashba coupling in wurtzite wells. We also find
a k-cubic Dresselhaus contribution. Both the bulk Rashba-type term and this cubic term originate exclusively
from the admixture of s- and pz-like states. Interestingly, in these systems the Rashba and
Dresselhaus Hamiltonians have the same symmetry and can in principle cancel each other out, thus making the
spin a conserved quantity. We then perform a self-consistent calculation on GaN/AlGaN single and
double wells with one and two occupied subbands and determine the intrasubband (intersubband)
Rashba and linear Dresselhaus SO strengths.
*FAPESP (2016/08468-0), CNPq, PRP/USP (Q-NANO), the National Natural Science Foundation of China (11004120 and 11874236), and the Research Fund of Qufu Normal University
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