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4 Acta Physica Polonica A

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High Mobility 2D Electron Gas in CdTe/CdMgTe Heterostructures

100%

Karczewski G. , Jaroszyński J. , Kutrowski M. , Barcz A. , Wojtowicz T. , Kossut J.

nr 4

829-832

We report on iodine doping of molecular beam epitaxy (MBE)-grown Cd(Mn)Te quasi-bulk films and modulation-doped CdTe/Cd_{1-y}Mg_{y}Te two-dimensional (2D) single quantum well structures. Modulation doping with iodine of CdTe/Cd_{1-y}Mg_{y}Te structures resulted in fabrication of a 2D electron gas with mobility exceeding 10^{5} cm^{2}/(V s). This is the highest mobility reported in wide-gap II-VI materials.

Novel CdTe/CdMgTe Graded Quantum Well Structures

84%

Wojtowicz T. , Kutrowski M. , Karczewski G. , Cywiński G. , Surma M. , Kossut J. , Yakovlev D. R. , Ossau W. , Landwehr G. , Kochereshko V.

nr 5

1063-1066

We report on growth and magnetooptical studies of two types of novel CdTe/CdMgTe quantum well structures having a precisely controlled grading of either the quantum well width or the donor concentration in a direction perpendicular to the growth axis. The presence of two-dimensional electron gas of varying concentration produced by the graded modulation doping was evidenced by observation of negatively charged exciton-electron complexes (X¯).

Carrier Density Control by Illumination in Surface Doped, p-Type (Cd,Mn)Te Quantum Wells

84%

Maślana W. , Kossacki P. , Gaj J. , Ferrand D. , Bertolini M. , Tatarenko S. , Cibert J. , Kutrowski M. , Wojtowicz T.

tom 110

nr 2

255-262

We report both decrease and increase in the 2D carrier gas density in a simple (Cd,Mn)Te/(Cd,Mg)Te heterostructure with (Cd,Mn)Te quantum well. The two effects were achieved by light with different photon energies. The quantum wells were 10 nm wide with 2D hole gas supplied by surface states. For the sample with 25 nm cap layer thickness, it was possible to tune the hole gas concentration from almost empty well (hole density below 1×10^{10} cm^{-2}) to 45×10^{10} cm^{-2}. The illumination with 425 nm wavelength almost doubled the hole gas density from the initial 24×10^{10} cm^{-2}. The depletion mechanism was most effective for illumination with the orange (575 nm) light.

Half-Parabolic Quantum Wells of Diluted Magnetic Semiconductor Cd_{1-x}Mn_{x}Te

67%

Kutrowski M. , Wojtowicz T. , Cywiński G. , Karczewski G. , Janik E. , Dynowska E. , Kossut J. , Kossacki P. , Fiederling R. , Pfeuffer-Jeschke A. , Ossau W.

nr 5

887-890

We report on magnetooptical studies of MBE-grown half-parabolic CdTe/Cd_{x}Mn_{1-x}Te quantum well structures. The value of the valence band offset Q_{v}=0.4 ± 0.05 was determined by comparing energies of optical transitions in the absence of a magnetic field with model calculations. This value was verified by fitting the observed spin splitting of the lowest heavy hole (hh) state. We discuss also the temperature dependence of Q_{v}.