## Title data

Cygorek, Moritz ; Axt, Vollrath Martin:

**Effective equations for the precession dynamics of electron spins and electron–impurity correlations in diluted magnetic semiconductors.**

*In:* Semiconductor Science and Technology.
Vol. 30
(2015)
Issue 8
.
- No. 085011.

ISSN 0268-1242

DOI: https://doi.org/10.1088/0268-1242/30/8/085011

## Project information

Project financing: |
Deutsche Forschungsgemeinschaft |
---|

## Abstract in another language

Starting from a quantum kinetic theory for the spin dynamics in diluted magnetic semiconductors, we derive simplified equations that effectively describe the spin transfer between carriers and magnetic impurities for an arbitrary initial impurity magnetization. Taking the Markov limit of these effective equations, we obtain good quantitative agreement with the full quantum kinetic theory for the spin dynamics in bulk systems at high magnetic doping. In contrast, the standard rate description where the carrier–dopant interaction is treated according to Fermi’s golden rule, which involves the assumption of a short memory as well as a perturbative argument, has been shown previously to fail if the impurity magnetization is non-zero. The Markov limit of the effective equations is derived, assuming only a short memory, while higher order terms are still accounted for. These higher order terms represent the precession of the carrier–dopant correlations in the effective magnetic field due to the impurity spins. Numerical calculations show that the Markov limit of our effective equations reproduces the results of the full quantum kinetic theory very well. Furthermore, this limit allows for analytical solutions and for a physically transparent interpretation.

## Further data

Item Type: | Article in a journal |
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Refereed: | Yes |

Keywords: | diluted magnetic semiconductors; DMS; spintronics; quantum kinetics; carrier-dopant correlations; spin transfer; exchange interaction; spin polarized carriers; non-Markovian spin dynamics; memory effects; coherent spin dynamics; ultrafast dynamics; spin precession |

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: | 03 Nov 2017 09:27 |

Last Modified: | 09 Mar 2022 10:58 |

URI: | https://eref.uni-bayreuth.de/id/eprint/40270 |