Cap Layer Effect on Key Features of Persistent Photoconductivity Spectra in HgTe/CdHgTe Double Quantum Well Heterostructures
Journal article published in 2023 by
Mikhail K. Sotnichuk,
Aleksei S. Kazakov,
Ilya D. Nikolaev,
Konstantin A. Drozdov,
Roman V. Menshchikov,
Sergey A. Dvoretsky 
,
Nikolay N. Mikhailov ,
Dmitry R. Khokhlov ,
Anton V. Ikonnikov
,
Nikolay N. Mikhailov ,
Dmitry R. Khokhlov ,
Anton V. Ikonnikov
This paper is made freely available by the publisher.
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Abstract
Persistent photoconductivity (PPC) spectra of HgTe/CdHgTe heterostructures with double quantum wells with different cap layers have been studied in the radiation excitation range 0.62–3.1 eV. We have shown that the material of the cap layer defines key features of the PPC spectra—local extrema—and their origin. An unusual oscillatory behavior of the PPC spectra is demonstrated. Such a behavior is shown to be independent of both cap and barrier layers.