Open AccessNonparabolicity of size-quantized subbands of bilayer semiconductor quantum wells with heterojunction
Author(s) -
Ilia A. Vovk,
Aleksandr P. Litvin,
Elena V. Ushakova,
Sergei A. Cherevkov,
A. V. Fëdorov,
Ivan D. Rukhlenko
Publication year - 2020
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.384227
Subject(s) - heterojunction , quantum well , bilayer , condensed matter physics , quantization (signal processing) , semiconductor , materials science , quantum , electron , quantum hall effect , laser , physics , optoelectronics , optics , chemistry , quantum mechanics , mathematics , biochemistry , membrane , algorithm
This paper presents a theory of size quantization and intersubband optical transitions in bilayer semiconductor quantum wells with asymmetric profile. We show that, in contrast to single-layer quantum wells, the size-quantized subbands of bilayer quantum wells are nonparabolic and characterized by effective masses that depend on the electron wave number and the subband number. It is found that the effective masses are related to the localization of the electron wave function in the layers of the quantum well and can be controlled by varying the chemical composition or geometric parameters of the structure. We also derive an analytical expression for the probability of optical transitions between the subbands of the bilayer quantum well. Our results are useful for the development of laser systems and photodetectors based on colloidal nanoplates and epitaxial layers of semiconductor materials with heterojunctions.