Time-Resolved Kerr Rotation Spectroscopy of Spin Dynamics in a Quantum Hall System

2010 ◽  
Author(s):  
D. Fukuoka ◽  
N. Tanaka ◽  
K. Oto ◽  
K. Muro ◽  
Y. Hirayama ◽  
...  
Keyword(s):  
Spin Dynamics ◽  
Quantum Hall ◽  
Kerr Rotation ◽  
Time Resolved ◽  
Quantum Hall System

Spin Relaxation in GaAs Doped with Magnetic (Mn) Atoms

2010 ◽  
Vol 168-169 ◽  
pp. 47-54
Author(s):  
Ilya A. Akimov ◽  
G.V. Astakhov ◽  
R.I. Dzhioev ◽  
K.V. Kavokin ◽  
V.I. Korenev ◽  
...  
Keyword(s):  
Spin Relaxation ◽  
Degrees Of Freedom ◽  
Spin Dynamics ◽  
Point Of View ◽  
Magnetic Impurities ◽  
Kerr Rotation ◽  
Time Resolved ◽  
G Factor ◽  
Theoretical Predictions ◽  
The Magnetic Field

The GaAs doped with donors manifests long times of spin relaxation, while in the case of acceptors (or magnetic impurities) spin relaxation rate increases markedly, in accordance with theoretical predictions. From the practical point of view, this situation is unfavorable, since the devices based on spin degrees of freedom require long times of the spin memory. Therefore semiconductors such as p-GaAs were not considered as promising materials for spintronics. In the present work this conclusion is refuted by means of investigation of the spin dynamics of electrons in epitaxial layers of gallium arsenide doped with Mn impurities. In spite of the expectations, we have discovered the suppression of the spin relaxation of electrons in GaAs:Mn by two orders of magnitude. This effect is a consequence of compensation of the hole and manganese effective magnetic fields due to the antiferromagnetic interaction. The analogous results obtained for the case of GaAs quantum well doped with Mn [R. C. Myers, et al., Nature Materials 7, 203 (2008)] were interpreted as the result of the spin precession of magnetic acceptors rather than electrons. Through separate measurements of g-factor by means of time resolved spectroscopy it has been proved that long times of spin relaxation in p-GaAs:Mn relate to electrons and not to magnetic acceptors. The oscillation frequency of the angle of Kerr rotation depends linearly on the magnetic field and complies with g=0.46±0.02, i.e. the electronic g-factor.

OPTICALLY INDUCED DYNAMIC NUCLEAR SPIN POLARIZATION IN QUANTUM HALL REGIME OBSERVED BY A TIME-RESOLVED KERR ROTATION

2009 ◽  
Vol 23 (12n13) ◽  
pp. 2755-2759 ◽  
Author(s):  
DAISUKE FUKUOKA ◽  
NAOKI TANAKA ◽  
KENICHI OTO ◽  
KIYOFUMI MURO ◽  
YOSHIRO HIRAYAMA ◽  
...  
Keyword(s):  
Spin Polarization ◽  
Nuclear Spin ◽  
Quantum Hall ◽  
Nuclear Spins ◽  
Nuclear Spin Polarization ◽  
Kerr Rotation ◽  
Time Resolved ◽  
Circularly Polarized ◽  
Quantum Hall Regime ◽  
Hall Regime

The dynamics between electron and nuclear spins in quantum Hall regime is investigated by a time-resolved Kerr rotation (TRKR) spectroscopy carried down in tilted-field geometry. The spin-flip energy varies almost linearly with the applied magnetic field under the nuclear spin depolarizing radio frequency field and the helicity modulation of circularly polarized pump, while the spin-flip energy obtained under a circularly polarized pump deviates from linearly behavior. This deviation is ascribed to the Overhauser shift due to dynamic nuclear spin polarization (DNP). The DNP depends markedly on the filling factor and present peaks at even filling factors. These results can be well explained by a simple model based on the detailed balance between electron and nuclear spins.

scholarly journals Imaging spin dynamics in monolayer WS 2 by time-resolved Kerr rotation microscopy

2D Materials ◽  
2017 ◽  
Vol 5 (1) ◽  
pp. 011010 ◽  
Author(s):  
Elizabeth J McCormick ◽  
Michael J Newburger ◽  
Yunqiu Kelly Luo ◽  
Kathleen M McCreary ◽  
Simranjeet Singh ◽  
...  
Keyword(s):  
Spin Dynamics ◽  
Kerr Rotation ◽  
Time Resolved

Nonexponential decoherence of collective spin states in 2DES probed by time-resolved Kerr rotation

2021 ◽  
pp. 114285
Author(s):  
E. Stepanets-Khussein ◽  
L.I. Musina ◽  
A.V. Larionov ◽  
A.S. Zhuravlev ◽  
I.V. Kukushkin ◽  
...  
Keyword(s):  
Spin States ◽  
Kerr Rotation ◽  
Time Resolved
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