Abstract
Cyclotron-resonance measurements in 21-nm-thick HgTe/CdHgTe quantum wells of different crystallographic orientations have been performed. It has been found that, in contrast to the structures with the (001) orientation of the quantum-well plane, (013)-oriented quantum wells are semimetallic and their absorption spectra exhibit both electron and hole cyclotron-resonance lines. The simultaneous presence of the two types of charge carriers originates from an overlap between the upper heavy-hole quantum-confinement subbands hh1 and hh2. This overlap is caused by the strong interaction of these subbands with the Dyakonov-Khaetskii interface state. Calculations carried out using the eight-band kp-Hamiltonian indicate that, for known values of the band-structure parameters, the overlap between hh2 and hh1 subbands does not occur; this result is in agreement with the cyclotron-resonance data for (001)-oriented structures. The enhanced interaction between heavy-hole and interface states owing to the existence of steps at low-symmetry heterointerfaces may be the mechanism responsible for the appearance of an overlap between subbands in HgTe quantum wells with orientation different from (001).
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Original Russian Text © A.A. Greshnov, Yu.B. Vasil’ev, N.N. Mikhailov, G.Yu. Vasil’eva, D. Smirnov, 2013, published in Pis’ma v Zhurnal Eksperimental’noi i Teoreticheskoi Fiziki, 2013, Vol. 97, No. 2, pp. 108–113.
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Greshnov, A.A., Vasil’ev, Y.B., Mikhailov, N.N. et al. Manifestation of a semimetallic state in cyclotron resonance in low-symmetry HgTe-based quantum wells. Jetp Lett. 97, 102–106 (2013). https://doi.org/10.1134/S0021364013020069
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DOI: https://doi.org/10.1134/S0021364013020069