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Theory of ultrafast optical manipulation of electron spins in quantum wells
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10.1063/1.2140868
/content/aip/journal/jap/98/12/10.1063/1.2140868
http://aip.metastore.ingenta.com/content/aip/journal/jap/98/12/10.1063/1.2140868
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Diagram of band-edge states of undoped quantum well after optically exciting an electron from the valence to the conduction band. (a) Two degenerate state configurations with different electron spin in the conduction band, between which quantum coherent oscillation is to be performed. (b) Intermediate states which mediate transition between and during the optical manipulation.

Image of FIG. 2.
FIG. 2.

Coherent manipulation of electron spin in the absence of hole-spin relaxation in the valence band. (a) Laser-induced Rabi oscillation between the spin-up and spin-down states, where the results depicted by the solid, dotted, and dashed curves are, respectively, from three approaches: the direct numerical calculation with the coherent subspace Hamiltonian of Eq. (4), the effective two-state multiparticle STIRAP Hamiltonian of Eq. (6) or (7), and the analysis based on the single-particle-state picture of Eq. (3). (b) The corresponding effective magnetic fields extracted from these three methods. Here, denotes the detuning.

Image of FIG. 3.
FIG. 3.

Hole-spin relaxation effect on the manipulation of the conduction-band electron spin, in the absence (a) and presence [(b) and (c)] of prerelaxation of the hole spin, respectively.

Image of FIG. 4.
FIG. 4.

Diagram of band-edge states of a doped quantum well. (a) Two degenerate state configurations with different electron spin in the conduction band, between which quantum coherent rotation is to be performed. (b) Intermediate states which mediate transition between and during the optical manipulation. Here, the detunings and differ in a certain sense from their counterparts and in the undoped quantum well, i.e., , and , with the Coulomb interaction energy of the doped electron and the (virtually) generated exciton.

Image of FIG. 5.
FIG. 5.

Comparison of optical manipulation of the conduction-band electron spin in doped and undoped quantum wells, in the (a) absence and (b) presence of hole-spin relaxation. The solid and dashed curves correspond to, respectively, results of the doped and undoped quantum wells.

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/content/aip/journal/jap/98/12/10.1063/1.2140868
2005-12-27
2014-04-25
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Theory of ultrafast optical manipulation of electron spins in quantum wells
http://aip.metastore.ingenta.com/content/aip/journal/jap/98/12/10.1063/1.2140868
10.1063/1.2140868
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