Magneto-optical study of asymmetric CdTe/(Cd,Mn)Te double-quantum-well nanostructures

Heimbrodt, W.; Goede, O.; Köpp, Th.; Hieke, K.; Gumlich, H.‐E.; Pier, Th.; Lunn, B.; Gregory, T.J.

doi:10.1016/0022-0248(92)90872-g

Cited by 19 publications

(6 citation statements)

References 6 publications

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“…In contrast to previous studies of Mn-based asymmetric double quantum wells (ADQWs) where the quantum wells (QW) were made of CdTe [2,3], in our system the wide well (WW) contains Mn, so as to increase drastically the influence of a magnetic field on the confined levels [4].…”

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confidence: 94%

“…Hf; 78.20.Ls, 78.47.+pa Semimagnetic semiconductors are of great interest because of their novel properties [1]. In particular, the strong interaction between the spins of carriers and the magnetic ions leads to giant magnetooptical effects such as extremely large Zeeman splittings.In contrast to previous studies of Mn-based asymmetric double quantum wells (ADQWs) where the quantum wells (QW) were made of CdTe [2,3], in our system the wide well (WW) contains Mn, so as to increase drastically the influence of a magnetic field on the confined levels [4].In this report we will present steady-state and time-resolved experiments at zero tesla, focusing on the influence of the tunnel barrier thickness on the tunneling.The samples were grown by molecular beam epitaxy in the (100) direction. The stuctures were deposited on a CdMnTe buffer layer of the same Mn concentration as the barriers.…”

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confidence: 98%

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Optical Study of an Asymmetric Double Quantum Well System: CdTe/CdMnTe

Lawrence¹,

Feuilet²,

Tuffigo³

et al. 1993

Acta Phys. Pol. A

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Carrier tunneling through CdMnTe barriers of different thicknesses is investigated in CdTe/CdMnTe asymmetric double quantum wells. Steady-state photoluminescence at 1.8 K and time-resolved photoluminescence experiments between 10 K and 50 K were performed.PACS numbers: 78.66. Hf; 78.20.Ls, 78.47.+pa Semimagnetic semiconductors are of great interest because of their novel properties [1]. In particular, the strong interaction between the spins of carriers and the magnetic ions leads to giant magnetooptical effects such as extremely large Zeeman splittings.In contrast to previous studies of Mn-based asymmetric double quantum wells (ADQWs) where the quantum wells (QW) were made of CdTe [2,3], in our system the wide well (WW) contains Mn, so as to increase drastically the influence of a magnetic field on the confined levels [4].In this report we will present steady-state and time-resolved experiments at zero tesla, focusing on the influence of the tunnel barrier thickness on the tunneling.The samples were grown by molecular beam epitaxy in the (100) direction. The stuctures were deposited on a CdMnTe buffer layer of the same Mn concentration as the barriers. Table compiles for the samples the Mn concentrations (of the barriers (xΒ), of the WW (xW)), and the thicknesses measured by Reflection High Energy Electron Diffraction (RHEED) oscillations (WW (LW), narrow well (LN), tunnel barrier (LB)).The photoluminescence (PL) spectra are depicted in Fig. 1. The emission of the fundamental excitons of both QWs is observed: e1Nhh1N at lower energy and e1Whh1W at higher energy. The labels hh 1 N (hh1W) mean the first heavy hole level in the narrow CdTe (wide,CdMnTe) QW. Note that because the gap increases with the Mn content, the WW luminescence appears at higher energy. The relative intensity of their luminescence (R = IW/IN) reflects the strength of the coupling. The observed increase in R when LB increases indicates a less efficient tunneling (637)

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confidence: 94%

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confidence: 98%

Optical Study of an Asymmetric Double Quantum Well System: CdTe/CdMnTe

Lawrence¹,

Feuilet²,

Tuffigo³

et al. 1993

Acta Phys. Pol. A

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“…1. The spectrum consists of two bands, their origin being determined earlier [ 5 ] . The electron state calculations and the measurement of the luminescence excitation spectrum have shown that the high-energy line corresponds to the radiative recombination of a. heavy hole exciton in a wide QW.…”

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confidence: 99%

Photoluminescence spectra of CdTe/CdMnTe quantum well structures in an external magnetic field

Aguekian

Ashenford

Lunn

et al. 1996

Physica Status Solidi (b)

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“…Such dependence of coupling on the relative well depth can be conveniently investigated in MQW's involving DMS wells, in which the band gap can be continuously varied relative to non-DMS wells. 28,29 To explore this issue, in the present study we used symmetric MQW structures consisting of DMS (Zn 1ϪxϪy Cd x Mn y Se) and non-DMS (Zn 1Ϫx Cd x Se) wells, separated by nonmagnetic ZnSe barriers. Our aim is to explore the limit of strong Zeeman splitting, occurring at high magnetic field, when changes in the DMS well potentials produced by the applied field are on the same scale as the well depth itself, leading to a transformation of the MQW systems into symmetric combinations of unequal wells.…”

Section: Introductionmentioning

confidence: 99%

Magnetic-field-induced substructures in multiple quantum wells consisting of magnetic and nonmagnetic semiconductor layers

et al. 2000

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We have investigated multiple quantum well systems consisting of diluted magnetic (Zn 1ϪxϪy Cd x Mn y Se) and nonmagnetic (Zn 1Ϫx Cd x Se) semiconductor wells, separated by nonmagnetic ZnSe barriers. By focusing on interband transitions involving the lowest multiplet of states ͑i.e., the ground state split by interwell interactions͒, we were able to study the details of the coupling between the wells. The strongest interaction between the states of each well occurs when the wells are identical ͑i.e., when they are in a resonant condition͒. The coupling between the wells is dramatically reduced in the presence of an external magnetic field, which can change the depth of diluted magnetic semiconductor ͑DMS͒ wells relative to the non-DMS wells via the large Zeeman splitting that occurs in the DMS layers. As soon as the depth of the wells becomes unequal, the multiple quantum well system subdivides into separate subsystems consisting of groups of equal ͑resonant͒ wells, one associated with non-DMS wells, and the other with DMS wells. This is clearly evident both from theoretical investigation and from the observed magnetic-field dependence of the absorption lines associated with the ground-state multiplet.

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Magneto-optical study of asymmetric CdTe/(Cd,Mn)Te double-quantum-well nanostructures

Cited by 19 publications

References 6 publications

Optical Study of an Asymmetric Double Quantum Well System: CdTe/CdMnTe

Optical Study of an Asymmetric Double Quantum Well System: CdTe/CdMnTe

Photoluminescence spectra of CdTe/CdMnTe quantum well structures in an external magnetic field

Magnetic-field-induced substructures in multiple quantum wells consisting of magnetic and nonmagnetic semiconductor layers

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