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Spin-sensitive intersubband dynamics of optically generated carriers in semiconductor quantum wells

Title data

Vogel, M. ; Vagov, Alexei ; Axt, Vollrath M. ; Seilmeier, Alois ; Kuhn, Tilmann:
Spin-sensitive intersubband dynamics of optically generated carriers in semiconductor quantum wells.
In: Physical Review B. Vol. 80 (2009) Issue 15 . - Art.Nr. 155310, 7 S..
ISSN 0163-1829
DOI: https://doi.org/10.1103/PhysRevB.80.155310

Abstract in another language

A theoretical analysis of the intersubband dynamics in undoped quantum wells is presented where spin-oriented carriers are initially generated by circularly polarized interband excitations. Subsequent resonant intersubband excitations induce Rabi rotations between the subbands resulting in a fast periodic modulation of the spin orientation in each subband. It is investigated whether pure spin modulations can be performed where the charge density of the subbands is kept constant when initially equal occupations of the two lowest conduction subbands with opposite spin orientations have been prepared. While this is the expected behavior for a three-band model of noninteracting particles it turns out that when the Coulomb interaction is taken into account the spin modulations are typically accompanied by corresponding modulations of the subband occupations. It is demonstrated that under realistic conditions it should nevertheless be feasible to realize a pure spin rotation in a given subband provided the intersubband excitations are sufficiently short or the carrier density is sufficiently low. Successive spin rotations are shown to decrease the degree of spin polarization even when spin-relaxation processes are neglected.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: quantum wells; intersubband dynamics; ultrafast dynamics; spintronics; spin polarized carriers; Terahertz control; Terahertz excitation; pump-probe
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: 30 Oct 2017 12:22
Last Modified: 30 Oct 2017 12:22
URI: https://eref.uni-bayreuth.de/id/eprint/40207