Dependence of quantum kinetic effects in the spin dynamics of diluted magnetic semiconductors on the excitation conditions
Non-Markovian quantum kinetic features, that cannot be captured by rate equations, have been predicted theoretically in the spin dynamics in diluted magnetic semiconductors excited with a circularly polarized laser. In order to identify situations which are most promising for detecting the genuine q...
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0277786X_v9931_n_p_Cygorek http://hdl.handle.net/20.500.12110/paper_0277786X_v9931_n_p_Cygorek |
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paper:paper_0277786X_v9931_n_p_Cygorek2023-06-08T15:26:39Z Dependence of quantum kinetic effects in the spin dynamics of diluted magnetic semiconductors on the excitation conditions Tamborenea, Pablo Ignacio Diluted magnetic semiconductors Optical excitation Quantum kinetics Spin dynamics Spintronics Diluted magnetic semiconductors Kinetic theory Kinetics Magnetic semiconductors Magnetism Magnetoelectronics Photoexcitation Semiconductor lasers Spin polarization Carrier spin polarization Circularly polarized lasers Excitation conditions External magnetic field Laser pulse duration Non-Markovian effects Quantum kinetic Quantum-kinetic theory Spin dynamics Non-Markovian quantum kinetic features, that cannot be captured by rate equations, have been predicted theoretically in the spin dynamics in diluted magnetic semiconductors excited with a circularly polarized laser. In order to identify situations which are most promising for detecting the genuine quantum kinetic effects in future experiments, we study numerically the strength of these effects for a number of different excitation conditions. In particular, we show that laser pulse durations of the order of the spin-transfer rate or longer are well suited for studying the non-Markovian effects. Furthermore, in the presence of an external magnetic field, the quantum kinetic theory predicts a significantly different stationary value for the carrier spin polarization than Markovian rate equations, which can be attributed to the build-up of strong carrier-impurity correlations. © 2016 SPIE. Fil:Tamborenea, P.I. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2016 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0277786X_v9931_n_p_Cygorek http://hdl.handle.net/20.500.12110/paper_0277786X_v9931_n_p_Cygorek |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Diluted magnetic semiconductors Optical excitation Quantum kinetics Spin dynamics Spintronics Diluted magnetic semiconductors Kinetic theory Kinetics Magnetic semiconductors Magnetism Magnetoelectronics Photoexcitation Semiconductor lasers Spin polarization Carrier spin polarization Circularly polarized lasers Excitation conditions External magnetic field Laser pulse duration Non-Markovian effects Quantum kinetic Quantum-kinetic theory Spin dynamics |
| spellingShingle |
Diluted magnetic semiconductors Optical excitation Quantum kinetics Spin dynamics Spintronics Diluted magnetic semiconductors Kinetic theory Kinetics Magnetic semiconductors Magnetism Magnetoelectronics Photoexcitation Semiconductor lasers Spin polarization Carrier spin polarization Circularly polarized lasers Excitation conditions External magnetic field Laser pulse duration Non-Markovian effects Quantum kinetic Quantum-kinetic theory Spin dynamics Tamborenea, Pablo Ignacio Dependence of quantum kinetic effects in the spin dynamics of diluted magnetic semiconductors on the excitation conditions |
| topic_facet |
Diluted magnetic semiconductors Optical excitation Quantum kinetics Spin dynamics Spintronics Diluted magnetic semiconductors Kinetic theory Kinetics Magnetic semiconductors Magnetism Magnetoelectronics Photoexcitation Semiconductor lasers Spin polarization Carrier spin polarization Circularly polarized lasers Excitation conditions External magnetic field Laser pulse duration Non-Markovian effects Quantum kinetic Quantum-kinetic theory Spin dynamics |
| description |
Non-Markovian quantum kinetic features, that cannot be captured by rate equations, have been predicted theoretically in the spin dynamics in diluted magnetic semiconductors excited with a circularly polarized laser. In order to identify situations which are most promising for detecting the genuine quantum kinetic effects in future experiments, we study numerically the strength of these effects for a number of different excitation conditions. In particular, we show that laser pulse durations of the order of the spin-transfer rate or longer are well suited for studying the non-Markovian effects. Furthermore, in the presence of an external magnetic field, the quantum kinetic theory predicts a significantly different stationary value for the carrier spin polarization than Markovian rate equations, which can be attributed to the build-up of strong carrier-impurity correlations. © 2016 SPIE. |
| author |
Tamborenea, Pablo Ignacio |
| author_facet |
Tamborenea, Pablo Ignacio |
| author_sort |
Tamborenea, Pablo Ignacio |
| title |
Dependence of quantum kinetic effects in the spin dynamics of diluted magnetic semiconductors on the excitation conditions |
| title_short |
Dependence of quantum kinetic effects in the spin dynamics of diluted magnetic semiconductors on the excitation conditions |
| title_full |
Dependence of quantum kinetic effects in the spin dynamics of diluted magnetic semiconductors on the excitation conditions |
| title_fullStr |
Dependence of quantum kinetic effects in the spin dynamics of diluted magnetic semiconductors on the excitation conditions |
| title_full_unstemmed |
Dependence of quantum kinetic effects in the spin dynamics of diluted magnetic semiconductors on the excitation conditions |
| title_sort |
dependence of quantum kinetic effects in the spin dynamics of diluted magnetic semiconductors on the excitation conditions |
| publishDate |
2016 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0277786X_v9931_n_p_Cygorek http://hdl.handle.net/20.500.12110/paper_0277786X_v9931_n_p_Cygorek |
| work_keys_str_mv |
AT tamboreneapabloignacio dependenceofquantumkineticeffectsinthespindynamicsofdilutedmagneticsemiconductorsontheexcitationconditions |
| _version_ |
1768543702684270592 |