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Feature Article - Semiconductor Superlattices with Small Band Offsets

100%

Yang G., Lewandowski L., Furdyna J., Ram-Mohan L.

Acta Physica Polonica A

1998

vol. 93

issue 4

567-600

Optical transitions in small band offset superlattices are studied within the framework of the nearly free electron approximation, in which the weak superlattice potential is treated as a perturbation. Interband selection rules are derived for transitions involving conduction and valence band states at the superlattice Brillouin zone center and the zone edge. It is found that a number of new transitions can occur in such small-offset superlattices due to wave function mixing of different subband states. The effect of the effective mass on the optical transitions is also discussed. The theory is used to explain the results observed in magneto-optical absorption experiment in ZnSe/Zn_{1-x}Mn_{x}Se small-offset superlattices. Furthermore, the nearly free electron formulation is found to be in excellent agreement with rigorous multi-band numerical calculation on superlattices involving small band offsets.

Far-Infrared Magneto-Optical Studies of HgTe-CdTe Superlattices in the Semimetallic Regime

76%

Wojtowicz T., Dobrowolska M., Furdyna J., Meyer J., Bartoli F., Hoffman C., Ram-Mohan L.

issue 2

245-254

We review recent magneto-optical investigations performed on HgTe-CdTe semimetallic superlattices. Far infrared magnetotransmission data obtained as a function of temperature, photon energy, and sense of circular polarization are compared with the predictions of a comprehensive new theory which fully incorporates the complexities of type-III superlattice band structure. It is found that the theory accounts for nearly all of the many unusual features which have been observed experimentally. These include the occurrence of two cyclotron resonances due to holes; the coexistence of electron and hole cyclotron resonances in the low temperature limit; the observation of three distinct CRA minima; a step-like change in the temperature dependence of the electron cyclotron mass; and a dramatic increase of the CRI absorption peak intensity with increasing magnetic field.

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2 Acta Physica Polonica A

1 1998

1 1991

2 Furdyna J.

2 Ram-Mohan L.

1 Bartoli F.

1 Dobrowolska M.

1 Hoffman C.

1 Lewandowski L.

1 Meyer J.

1 Wojtowicz T.

1 Yang G.

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Feature Article - Semiconductor Superlattices with Small Band Offsets

Far-Infrared Magneto-Optical Studies of HgTe-CdTe Superlattices in the Semimetallic Regime