Open AccessTemperature activation of indirect exciton in nanostructures based on MoS2
Author(s) -
O O Smirnova,
I. A. Eliseyev,
A. V. Rodina,
T. V. Shubina
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 - 10.1088/1742-6596/1482/1/012038
Subject(s) - exciton , photoluminescence , biexciton , monolayer , condensed matter physics , materials science , spin (aerodynamics) , nanostructure , physics , nanotechnology , optoelectronics , thermodynamics
Micro-photoluminescence studies of MoS 2 nanotubes have shown that both direct and indirect excitonic transitions contribute to the emission spectra despite the fact that dozens of monolayers are inside their walls and, therefore, only indirect exciton emission would be expected. In addition, the intensity of the indirect exciton band increases with temperature in contrast to the direct exciton band, the intensity of which decreases. The same effects are observed for MoS 2 flakes. To describe these phenomena, we propose a theoretical model that considers the balance between exciton transitions taking into account the spin-forbidden exciton states.