Titlebar

Export bibliographic data
Literature by the same author
plus on the publication server
plus at Google Scholar

 

Dynamics of the angular momentum in narrow quantum rings with Rashba and Dresselhaus spin-orbit interactions

Title data

Lia, J. M. ; Tamborenea, Pablo I. ; Cygorek, Moritz ; Axt, Vollrath Martin:
Dynamics of the angular momentum in narrow quantum rings with Rashba and Dresselhaus spin-orbit interactions.
In: Physical Review B. Vol. 105 (2022) Issue 11 . - No. 115426.
ISSN 0163-1829
DOI: https://doi.org/10.1103/PhysRevB.105.115426

Official URL: Volltext

Project information

Project financing: We acknowledge financial support from the University of Buenos Aires Grant No. UBACyT 2018-20020170100711BA, and from the Argentine ANPCyT, Grant No. PICT-2016-1056.

Abstract in another language

The quantum dynamics of the electron's spin and orbital angular momenta in semiconductor quantum rings is analyzed. Both Rashba and Dresselhaus spin-orbit interactions (SOIs) in their quasi-two-dimensional forms are taken into account. The narrow quantum rings are treated with models including one and two radial modes. We find that when either Rashba or Dresselhaus SOI acts alone, the different angular momentum states are coupled in blocks of two (for a single radial mode) or four (for two radial modes). We also show that the full Hilbert space splits into two disjoint subspaces, which are not coupled by either of the two SOIs, thereby decoupling accordingly the state evolution. When both SOI mechanisms are present, in principle infinitely many states are coupled, but we find by numerical computation of the quantum dynamics that for typical evolution times in practice only a few neighboring states are involved in the dynamics. Thus the exchange of angular momenta proceeds only via very few states. Furthermore, we find a trend that when initially high orbital momenta are prepared, the time evolution of spin and orbital momenta is almost unaffected by the availability of a second radial mode, in sharp contrast to the case of preparing the system in low orbital angular momentum states. The implications of our findings for the coherent control of angular momentum in quantum rings are pointed out.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: spintronics; quantum rings; spin-orbit interaction; spin dynamics
Subject classification: condensed matter physics (theoretical)
Institutions of the University: Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Chair Theoretical Physics III > Chair Theoretical Physics III - Univ.-Prof. Dr. Martin Axt
Faculties
Faculties > Faculty of Mathematics, Physics und Computer Science
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Chair Theoretical Physics III
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 530 Physics
Date Deposited: 28 Mar 2022 07:37
Last Modified: 07 Sep 2022 11:04
URI: https://eref.uni-bayreuth.de/id/eprint/69037