Far-Infrared Magneto-Optical Studies of HgTe-CdTe Superlattices in the Semimetallic Regime |
| T. Wojtowicz, M. Dobrowolska, J.K. Furdyna University of Notre Dame, Notre Dame, IN 46556, USA J.R. Meyer, F.J. Bartoli, C.A. Hoffman Naval Research Laboratory, Washington, D.C. 20375, USA and L.R. Ram-Mohan Worcester Polytechnic Institute, Worcester, MA 01609, USA |
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| 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. |
| DOI: 10.12693/APhysPolA.80.245 PACS numbers: 78.65.Fa, 78.30.Fs |