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Localized interlayer complexes in heterobilayer transition metal dichalcogenides
- Source :
- Phys. Rev. B 97, 195452 (2018)
- Publication Year :
- 2018
-
Abstract
- We present theoretical results for the radiative rates and doping-dependent photoluminescence spectrum of interlayer excitonic complexes localized by donor impurities in MoSe$_2$/WSe$_2$ twisted heterobilayers, supported by quantum Monte Carlo calculations of binding energies and wave-function overlap integrals. For closely aligned layers, radiative decay is made possible by the momentum spread of the localized complexes' wave functions, resulting in few $\mu$s$^{-1}$ radiative rates. For strongly misaligned layers, the short-range interaction between the carriers and impurity provides a finite radiative rate with a strong asymptotic twist angle dependence $\propto \theta^{-8}$. Finally, phonon-assisted recombination is considered, with emission of optical phonons in both layers resulting in additional weaker emission lines, redshifted by the phonon energy.<br />Comment: 19 pages, including 11 figures and 5 appendices
- Subjects :
- Condensed Matter - Mesoscale and Nanoscale Physics
Subjects
Details
- Database :
- arXiv
- Journal :
- Phys. Rev. B 97, 195452 (2018)
- Publication Type :
- Report
- Accession number :
- edsarx.1802.06005
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1103/PhysRevB.97.195452