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Insensitivity of spin dynamics to the orbital angular momentum transferred from twisted light to extended semiconductors

Title data

Cygorek, Moritz ; Tamborenea, P. I. ; Axt, Vollrath M.:
Insensitivity of spin dynamics to the orbital angular momentum transferred from twisted light to extended semiconductors.
In: Physical Review B. Vol. 92 (2015) Issue 11 . - Art.Nr. 115301, 5 S..
ISSN 0163-1829
DOI: https://doi.org/10.1103/PhysRevB.92.115301

Project information

Project financing: Deutsche Forschungsgemeinschaft
Supported by the Universidad de Buenos Aires, project UBACyT 2011-2014 No. 20020100100741, and from CONICET, project PIP 11220110100091.

Abstract in another language

We study the spin dynamics of carriers due to the Rashba interaction in semiconductor quantum disks and wells after excitation with light with orbital angular momentum. We find that although twisted light transfers orbital angular momentum to the excited carriers and the Rashba interaction conserves their total angular momentum, the resulting electronic spin dynamics is essentially the same for excitation with light with orbital angular momentum l=+|l| and l=−|l|. The differences between cases with different values of |l| are due to the excitation of states with slightly different energies and not to the different angular momenta per se and vanish for samples with large radii where a k-space quasicontinuum limit can be established. These findings apply not only to the Rashba interaction but also to all other envelope-function-approximation spin-orbit Hamiltonians like the Dresselhaus coupling.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: light with orbital angular momentum; twisted light; spintronics; spin-orbit interaction; quantum disks; quantum wells; Rashba coupling; Dresselhaus interaction; ultrafast dynamics
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: 02 Nov 2017 12:30
Last Modified: 02 Nov 2017 12:30
URI: https://eref.uni-bayreuth.de/id/eprint/40278