Optical spin pumping of modulation-doped electrons probed by a two-color Kerr rotation technique

By means of the time-resolved Kerr rotation technique, a spin-depolarized electron system at a filling factor ν = 1 in a GaAs quantum well was studied. At temperatures above 5 K, a transition from a new spin-correlated state to a state with low spin stiffness characteristic of a single-particle electron system was found. A nonlinear contribution to the decay of Larmor oscillations arising at low temperatures, when spin-spin correlations determine the ground state of a two-dimensional electron system, is highlighted. The parameters of the fluctuating magnetic field acting on individual electron spins are estimated.

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Spin precession of holes in wurtzite GaN studied using the time-resolved Kerr rotation technique

Physical Review B ◽

10.1103/physrevb.72.121203 ◽

2005 ◽

Vol 72 (12) ◽

Cited By ~ 13

Author(s):

C. Y. Hu ◽

K. Morita ◽

H. Sanada ◽

S. Matsuzaka ◽

Y. Ohno ◽

...

Keyword(s):

Spin Precession ◽

Kerr Rotation ◽

Time Resolved ◽

Rotation Technique

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MAGNETIC PROPERTIES AND KERR ROTATION IN AMORPHOUS Ce-Fe AND Pr-Fe ALLOYS

Le Journal de Physique Colloques ◽

10.1051/jphyscol:19808163 ◽

1980 ◽

Vol 41 (C8) ◽

pp. C8-650-C8-653 ◽

Cited By ~ 3

Author(s):

K. H.J. Buschow ◽

P. G. Van Engen

Keyword(s):

Magnetic Properties ◽

Kerr Rotation ◽

Fe Alloys

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Spin pumping

Physics Subject Headings (PhySH) ◽

10.29172/abbb2e9b-e4ac-48ab-a10a-113643dad34c ◽

2018 ◽

Keyword(s):

Spin Pumping

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Ultrafast non-excitonic valley Hall effect in MoS2/WTe2 heterobilayers

Nature Communications ◽

10.1038/s41467-021-21013-w ◽

2021 ◽

Vol 12 (1) ◽

Author(s):

Jekwan Lee ◽

Wonhyeok Heo ◽

Myungjun Cha ◽

Kenji Watanabe ◽

Takashi Taniguchi ◽

...

Keyword(s):

Hall Effect ◽

Quantitative Information ◽

Exciton Energy ◽

Electron Hole ◽

Kerr Rotation ◽

Polarized Electrons ◽

Spatially Resolved ◽

Long Valley ◽

Bound Electron ◽

Valley Hall Effect

AbstractThe valley Hall effect (VHE) in two-dimensional (2D) van der Waals (vdW) crystals is a promising approach to study the valley pseudospin. Most experiments so far have used bound electron-hole pairs (excitons) through local photoexcitation. However, the valley depolarization of such excitons is fast, so that several challenges remain to be resolved. We address this issue by exploiting a unipolar VHE using a heterobilayer made of monolayer MoS2/WTe2 to exhibit a long valley-polarized lifetime due to the absence of electron-hole exchange interaction. The unipolar VHE is manifested by reduced photoluminescence at the MoS2 A exciton energy. Furthermore, we provide quantitative information on the time-dependent valley Hall dynamics by performing the spatially-resolved ultrafast Kerr-rotation microscopy; we find that the valley-polarized electrons persist for more than 4 nanoseconds and the valley Hall mobility exceeds 4.49 × 103 cm2/Vs, which is orders of magnitude larger than previous reports.

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