Abstract
Photoconductivity spectra in a HgTe/CdHgTe double quantum well with a normal band structure have been studied. Photosensitivity bands associated with the ionization of a mercury vacancy, which is a doubly charged acceptor, have been detected in photoconductivity spectra. The transformation of photoconductivity spectra when the Fermi level moves from the edge of the valence band through the band gap to the conduction band has been revealed using the residual photoconductivity effect. It has been shown that the observed absorption bands are due to the ionization of doubly charged acceptors rather than individual different singly charged states.
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Acknowledgments
We are grateful to L.S. Bovkun for assistance in the analysis of transport measurements.
Funding
This work was supported by the Russian Science Foundation (project no. 19-72-00128). The measurements of the magnetoresistance were supported by the Council of the President of the Russian Federation for State Support of Young Scientists and Leading Scientific Schools (project no. MK-1430.2020.2).
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Russian Text © The Author(s), 2020, published in Pis’ma v Zhurnal Eksperimental’noi i Teoreticheskoi Fiziki, 2020, Vol. 111, No. 10, pp. 682–688.
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Nikolaev, I.D., Uaman Svetikova, T.A., Rumyantsev, V.V. et al. Probing States of a Double Acceptor in CdHgTe Heterostructures via Optical Gating. Jetp Lett. 111, 575–581 (2020). https://doi.org/10.1134/S0021364020100124
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DOI: https://doi.org/10.1134/S0021364020100124