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Non-Markovian spin transfer dynamics in magnetic semiconductors despite short memory times

Title data

Thurn, Christoph ; Cygorek, Moritz ; Axt, Vollrath M. ; Kuhn, Tilmann:
Non-Markovian spin transfer dynamics in magnetic semiconductors despite short memory times.
In: Physical Review B. Vol. 87 (2013) Issue 20 . - Art.Nr. 205301, 10 S..
ISSN 0163-1829
DOI: https://doi.org/10.1103/PhysRevB.87.205301

Abstract in another language

A quantum kinetic theory of the spin transfer between carriers and Mn atoms in a Mn-doped diluted magnetic semiconductor is presented. It turns out that the typical memory time associated with these processes is orders of magnitude shorter than the time scale of the spin transfer. Nevertheless, Markovian rate equations, which are obtained by neglecting the memory, work well only for bulk systems. For quantum wells and wires the quantum kinetic results qualitatively deviate from the Markovian limit under certain conditions. Instead of a monotonic decay of an initially prepared excess electron spin, an overshoot or even coherent oscillations are found. It is demonstrated that these features are caused by energetic redistributions of the carriers due to the energy-time uncertainty.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: diluted magnetic semiconductors; DMS; spintronics; quantum kinetics; carrier-dopant correlations; spin transfer; exchange interaction; spin polarized carriers; energy-time uncertainty; quantum wells; coherent spin dynamics; non-Markovian spin dynamics; short memory
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 15:15
Last Modified: 02 Nov 2017 15:15
URI: https://eref.uni-bayreuth.de/id/eprint/40254