Abstract
The direct-indirect gap transition accompanying thickness change has a strong effect on luminescence. The present chapter covers various aspects of luminescence such as strain and electrical gating effects but excludes spin-valley coupling (which is the subject of a dedicated chapter). Of special interest is the observation of single photon emission from monolayers.
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- 1.
Conflicting results for \(\mathrm {MoTe_{2}}\) were obtained in [4], where low-temperature measurements were performed and it was found that the PL yield was identical for mono and bilayer samples, decreased slightly for trilayer, and was significantly lower in the tetralayer, from which it was concluded that both mono and bilayer \(\mathrm {MoTe_{2}}\) are direct band gap semiconductors with tetralayer \(\mathrm {MoTe_{2}}\) being an indirect gap semiconductor and with trilayers having nearly identical direct and indirect gaps. This discrepancy was interpreted in terms of a small differences in the size of the indirect and direct gaps in layers of different thickness, comparable to kT at room temperature, which can account for different results at different temperatures.
- 2.
A trion is a charged quasiparticle consisting of one electron and two holes (or two electrons and one hole) bound together. see Chap. 9 for a more detailed description.
- 3.
The \(\varLambda \)-point was not shown in the original work and was added to Fig. 8.6b by the present authors.
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Kolobov, A.V., Tominaga, J. (2016). Luminescence of 2D TMDC. In: Two-Dimensional Transition-Metal Dichalcogenides. Springer Series in Materials Science, vol 239. Springer, Cham. https://doi.org/10.1007/978-3-319-31450-1_8
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