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

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

Acta Physica Polonica A

2006

vol. 110

issue 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.

Control of Ferromagnetism in Cd_{1-x}Mn_xTe Based Quantum Wells

100%

Bertolini M., Boukari H., Ferrand D., Cibert J., Tatarenko S., Gilles B., Maślana W., Gaj J., Kossacki P., Dietl T.

issue 4-5

603-608

New structures aiming at controlling the ferromagnetic properties of diluted magnetic semiconductor quantum wells are presented. The carrier density is controlled by applying a voltage across a p-i-n diode. A new method, creating a 2D hole gas by adjusting the distance between the quantum well and surface, offers opportunities for a broader range of structures.

Photoluminescence of p-Doped Quantum Wells with Strong Spin Splitting

100%

Boukari H., Kossacki P., Bertolini M., Ferrand D., Cibert J., Tatarenko S., Gaj J., Deveaud B., Ciulin V.

Acta Physica Polonica A

2004

vol. 106

issue 3

299-310

Photoluminescence of p-type modulation doped (Cd,Mn)Te quantum wells is studied with carrier density up to 5×10^{11} cm^{-2} at various spin splittings. This splitting can be made larger than the characteristic energies of the system thanks to the giant Zeeman effect. At small spin splitting and regardless of the carrier density, the photoluminescence exhibits a single line, which corresponds to the charged exciton in the singlet state. Above a certain spin splitting, the charged exciton is destabilized in favor of the exciton at vanishing hole density, and in favor of a double line at higher carrier density. It is found here that the charged exciton destabilization energy hardly depends on the carrier density. The double line is found to be band-to-band like, with the same initial state - where the holes have the same spin orientation - and final states that differ by some excitation of the 2D hole gas. In addition, the spin splitting needed to fully polarize the hole gas is twice smaller than expected from the single particle image and gives a unique insight into many-body effects in the hole gas.

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3 Acta Physica Polonica A

1 2006

1 2004

1 2002

3 Bertolini M.

3 Cibert J.

3 Ferrand D.

3 Gaj J.

3 Kossacki P.

3 Tatarenko S.

2 Boukari H.

2 Maślana W.

1 Ciulin V.

1 Deveaud B.

1 Dietl T.

1 Gilles B.

1 Kutrowski M.

1 Wojtowicz T.

Search results

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

Control of Ferromagnetism in Cd_{1-x}Mn_xTe Based Quantum Wells

Photoluminescence of p-Doped Quantum Wells with Strong Spin Splitting