Interlayer exciton dynamics in a dichalcogenide monolayer heterostructure
By P. Nagler, G. Plechinger, M. V. Ballottin, A. Mitioglu, Sebastian B. Meier, N. Paradiso, C. Strunk, A. Chernikov, P. Christianen, C. Schüller and 1 more. 2017
185 citations recorded by the source corpus.
In heterostructures consisting of different transition-metal dichalcogenide monolayers, a staggered band alignment can occur, leading to rapid charge separation of optically generated electron–hole pairs into opposite monolayers. These spatially separated electron–hole pairs are Coulomb-coupled and form interlayer excitons. Here, we study these interlayer excitons in a heterostructure consisting of MoSe2 and WSe2 monolayers using photoluminescence spectroscopy. We observe a non-trivial temperature dependence of the linewidth and the peak energy of the interlayer exciton, including an unusually strong initial redshift of the transition with temperature, as well as a pronounced blueshift of the emission energy with increasing excitation power. By combining these observations with time-resolved photoluminescence measurements, we are able to explain the observed behavior as a combination of interlayer exciton diffusion and dipolar, repulsive exciton-exciton interaction.
Subfields: Atomic and Molecular Physics, and Optics, Materials Chemistry
View Paper: https://www.semanticscholar.org/paper/de01bebde89ffa57642b711b1f7f15203775ad17
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In Atomic and Molecular Physics, and Optics
In Materials Chemistry
Citations in the corpus
- Exciton physics and device application of two-dimensional transition metal dichalcogenide semiconductors (2018, background): “erostructures present an emerging field of research, where recently an increasing number of studies has been published, in particular demonstrating the appearance of interlayer excitons in PL spectra [22, 23, 86, 87]. Here, a pronounced additional resonance is observed below the energy of intralayer”