Manipulating nonlinear optical responses from spin-polarized electrons in a two-dimensional electron gas via exciton injection

O'Leary, Shannon; Wang, Hailin

doi:10.1103/physrevb.77.165309

Cited by 7 publications

(6 citation statements)

References 24 publications

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“…[3], [4] A review of experiments involving spin flips in solids has been given, [5] and more recently experimental investigations of nonlinear optical effects for spin polarized electrons in semiconductors has been undertaken. [6] Spin flip by a dc voltage in a quantum dot was also reported. [7] For these reasons it is important to know the effect of an electromagnetic wave on the spin state.…”

Section: Introductionmentioning

confidence: 89%

Spin flip probability of electron in a uniform magnetic field

Hammond¹

2012

Applied Physics Letters

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Section: Introductionmentioning

confidence: 89%

Spin flip probability of electron in a uniform magnetic field

Hammond¹

2012

Applied Physics Letters

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“…1(b). In these experiments, the pump initializes via the trion transition an electron spin polarization along the z axis [17][18][19]. The spin polarization precesses around the external magnetic field along the x axis (B ¼ 0:4T).…”

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confidence: 99%

“…The spin polarization precesses around the external magnetic field along the x axis (B ¼ 0:4T). A weak probe, arriving at a later time, detects the spin precession by measuring the differential transmission (DT) induced by the precessing spin polarization [19]. The control, applied at a fixed delay after the pump, induces an electron spin rotation around the z axis.…”

mentioning

confidence: 99%

“…For transient DT studies, the excitation of jt þ i by a þ -polarized pump leaves a net spin-polarized electron population with s z ¼À1=2 in the 2D electron gas, generating a spin polarization initially along the z axis [17][18][19]. Larmor precession of the spin polarization leads to spin beats with T B ¼ 116 ps, as shown by the top curve in Fig.…”

mentioning

confidence: 99%

“…The phase of the spin beats indicates the direction of the spin polarization in the y-z plane. The decay of the spin beats is determined by the spin dephasing time T Ã 2 $ 0:5n sand has been investigated in extensive earlier studies [17][18][19]. Figure 2 shows the temporal evolution of the spin polarization when a control is applied at a delay of 1:75T B after the pump, at which time the spin polarization is along the y axis.…”

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confidence: 99%

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Ultrafast Coherent Electron Spin Flip in a Modulation-Doped CdTe Quantum Well

et al. 2009

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We report the experimental realization of coherent electron spin flip in a modulation-doped CdTe quantum well. Coherent spin rotation is realized with an off-resonant laser pulse, which induces a polarization-dependent optical Stark shift in the trion resonance. Complete electron spin flip is made possible by a laser pulse designed to avoid excessive excitations of nearby exciton resonances and minimizes detrimental many-body effects. These results demonstrate an effective approach for ultrafast optical spin control in a complex spin system.

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Optical manipulation of electron spin coherence in colloidal CdS quantum dots

Feng¹,

Shan²,

Jia³

et al. 2013

Applied Physics Letters

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We report experimental studies of optical manipulation of electron spin coherence by linearly or circularly polarized short laser pulses at room temperature, in an ensemble of colloidal CdS quantum dots. In addition to a conventional pump-probe configuration, a linearly polarized prepump pulse before the pump could significantly enhance the amplitude of pump-induced electron spin coherence, owing to the fact that prepump pulses produce more resident electrons. And a linearly or circularly polarized control pulse after the pump will efficiently suppress the spin coherence, because of the re-excitation of spin-polarized electrons to trion states by the absorption of control photons.

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Manipulating nonlinear optical responses from spin-polarized electrons in a two-dimensional electron gas via exciton injection

Cited by 7 publications

References 24 publications

Spin flip probability of electron in a uniform magnetic field

Spin flip probability of electron in a uniform magnetic field

Ultrafast Coherent Electron Spin Flip in a Modulation-Doped CdTe Quantum Well

Optical manipulation of electron spin coherence in colloidal CdS quantum dots

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