Open AccessVacancions in the two-dimensional Wigner crystal
Author(s) -
V. E. Bisti
Publication year - 2020
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1556/1/012042
Subject(s) - wigner crystal , quasiparticle , electron , quantum tunnelling , condensed matter physics , photoluminescence , crystal (programming language) , heterojunction , physics , electronic band structure , atomic physics , quantum mechanics , optics , superconductivity , computer science , programming language
From a new point of view, the recombination of two-dimensional electrons enclosed in a MgZnO/ZnO heterojunction with localized holes in the valence band is considered. It is suggested to consider quasi-holes in the two-dimensional electron system as quasiparticles in the Wigner crystal. The quasiparticles corresponding to electrons removed from the Wigner crystal are vacancions. Because of quantum tunneling effect, they are not localized. The vacancion energies E ( k ) form a band of width D which is proportional to the vacancy tunneling probability. The width D corresponds to the photoluminescence band of the two-dimensional electron system. The shape of the photoluminescence band of the Wigner crystal is considered within the tight-binding approximation for dispersion E ( k ) and compared with the experimental results.