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arXiv · 1703.00379

Interlayer exciton dynamics in a dichalcogenide monolayer heterostructure

Philipp Nagler·Gerd Plechinger·Mariana V. Ballottin·Anatolie Mitioglu·Sebastian Meier·Nicola Paradiso·Christoph Strunk·Alexey Chernikov·Peter C. M. Christianen·Christian Schüller·Tobias Korn
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Abstract

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 MoSe$_2$ and WSe$_2$ 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.

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Philipp Nagler, Gerd Plechinger, Mariana V. Ballottin, Anatolie Mitioglu, Sebastian Meier, Nicola Paradiso, Christoph Strunk, Alexey Chernikov, Peter C. M. Christianen, Christian Schüller, Tobias Korn. 2017-03-01. Interlayer exciton dynamics in a dichalcogenide monolayer heterostructure. https://doi.org/10.1088/2053-1583%2Faa7352

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