Energy transfer from photocarriers into the magnetic ion system mediated by a two-dimensional electron gas in (Cd,Mn)Te/(Cd,Mg)Te quantum wells

König, Barbara; Merkulov, I. A.; Yakovlev, D. R.; Ossau, W.; Ryabchenko, S. M.; Kutrowski, M.; Wójtowicz, T.; Karczewski, G.; Kossut, J.

doi:10.1103/physrevb.61.16870

Cited by 95 publications

(96 citation statements)

References 34 publications

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“…16 or in Ref. 12. Since we restrict ourselves to the Luttinger-Kohn Hamiltonian, spurious solutions that could affect a general Kane model do not occur.…”

Section: ͑22͒mentioning

confidence: 99%

Time-dependent model for diluted magnetic semiconductors including band structure and confinement effects

2010

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A free-parameter theoretical model is developed in order to study the ultrafast dynamics in confined diluted magnetic semiconductors induced by laser. The hole-spin relaxation process is due to the Elliot-Yafet mechanism, which involves the scattering of the holes on the localized magnetic impurities. The role played by the quantum confinement and the band structure is analyzed. It is shown that the sample thickness and the background hole density strongly influences the phenomenon of demagnetization. Quantitative results are given for III-V ferromagnetic GaMnAs quantum wells of thickness 4 and 6 nm.

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“…16 or in Ref. 12. Since we restrict ourselves to the Luttinger-Kohn Hamiltonian, spurious solutions that could affect a general Kane model do not occur.…”

Section: ͑22͒mentioning

confidence: 99%

Time-dependent model for diluted magnetic semiconductors including band structure and confinement effects

2010

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“…We point out that the experimental detection of the effects evaluated here is difficult, as vortex-induced reduction of the Zeeman splitting can be confused with the effect of magnetic ion heating [17]. Moreover, the PL spectrum contains more than one peak.…”

Section: Resultsmentioning

confidence: 97%

Optical Properties of a Semimagnetic Quantum Well in a Proximity of a Superconducting Film

2005

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We consider, via numerical calculations, a hybrid structure made of a semimagnetic Cd1−xMnxTe quantum well deposited in a close proximity to superconducting niobium film. We simulate photoluminescence and the Faraday rotation spectra, modified by the presence of vortices in this type II superconductor. The magnitude of the evaluated effects is small -the vortex induced spectral line shape variation is of the order of 1% at 1 K and 0.1% at 3 K and is expected to occur mainly in the field range between 0.03 T and 0.05 T.

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“…This temperature is higher than the inversion temperature detected in the mw-induced current (T = 20 K). We attribute this difference to the mw-heating of the Mn spin system above T , as reported in [6,12].…”

Section: Tion With Mnmentioning

confidence: 96%

Spin polarized electric currents in semiconductor heterostructures induced by microwave radiation

Drexler

Belkov

Ashkinadze

et al. 2011

2011 International Conference on Infrared, Millimeter, and Terahertz Waves

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We report on microwave (mw) radiation induced electric currents in (Cd,Mn)Te/(Cd,Mg)Te and InAs/(In,Ga)As quantum wells subjected to an external in-plane magnetic field. The current generation is attributed to the spin-dependent energy relaxation of electrons heated by mw radiation. The relaxation produces equal and oppositely directed electron flows in the spin-up and spin-down subbands yielding a pure spin current. The Zeeman splitting of the subbands in the magnetic field leads to the conversion of the spin flow into a spin-polarized electric current.PACS numbers: 73.21. Fg, 72.25.Fe, 78.67.De, 73.63.Hs The discovery of microwave induced oscillations in the resistivity of a two-dimensional electron gas (2DEG) attracted growing attention to an electron magnetotransport in semiconductor nanostructures subjected to mw radiation, see, e.g., [1,2]. The experimental observation of mw-induced effects stimulated much theoretical interest (see [3] and references therein) since they provide information which is complementary to conventional transport. In addition, the mw-induced effects offer new ways for developing sensitive microwave detectors [4]. All these effects have been observed applying an external magnetic field perpendicularly to a 2DEG plane.In this Letter we demonstrate that microwave radiation induces a novel electron transport effect also under an in-plane magnetic field, i.e., in the geometry that excludes the cyclotron motion and Landau quantization of the two-dimensional electrons. The effect is caused by an asymmetric spin-dependent electron energy relaxation of the 2DEG heated by mw radiation [5,6]. In an external magnetic field, this process results in a spin-polarized electric current. The mw-induced currents are observed in two different semiconductor systems: diluted magnetic semiconductor (DMS) (Cd,Mn)Te/(Cd,Mg)Te quantum wells (QWs) and InAs/(In,Ga)As QWs. In these structures the spin-polarized electric currents are enhanced due to either the presence of magnetic Mn 2+ ions [6] or the strong spin-orbit coupling in InAs [5].Two n-type doped QW structures have been grown by molecular-beam epitaxy on (001)-oriented substrates. The first sample has a digital alloy DMS QW [7], which is a 10 nm-wide CdTe QW containing three monolayers of Cd 0.86 Mn 0.14 Te (see inset in . Insets show the experimental geometry and the structure sketch.

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Energy transfer from photocarriers into the magnetic ion system mediated by a two-dimensional electron gas in (Cd,Mn)Te/(Cd,Mg)Te quantum wells

Cited by 95 publications

References 34 publications

Time-dependent model for diluted magnetic semiconductors including band structure and confinement effects

Time-dependent model for diluted magnetic semiconductors including band structure and confinement effects

Optical Properties of a Semimagnetic Quantum Well in a Proximity of a Superconducting Film

Spin polarized electric currents in semiconductor heterostructures induced by microwave radiation

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