Efficient phonon cascades in WSe2 monolayers

Ioannis Paradisanos (), Gang Wang, Evgeny M. Alexeev, Alisson R. Cadore, Xavier Marie, Andrea C. Ferrari (), Mikhail M. Glazov () and Bernhard Urbaszek ()
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Ioannis Paradisanos: Université de Toulouse, INSA-CNRS-UPS, LPCNO
Gang Wang: University of Cambridge
Evgeny M. Alexeev: University of Cambridge
Alisson R. Cadore: University of Cambridge
Xavier Marie: Université de Toulouse, INSA-CNRS-UPS, LPCNO
Andrea C. Ferrari: University of Cambridge
Mikhail M. Glazov: Ioffe Institute
Bernhard Urbaszek: Université de Toulouse, INSA-CNRS-UPS, LPCNO

Nature Communications, 2021, vol. 12, issue 1, 1-7

Abstract: Abstract Energy relaxation of photo-excited charge carriers is of significant fundamental interest and crucial for the performance of monolayer transition metal dichalcogenides in optoelectronics. The primary stages of carrier relaxation affect a plethora of subsequent physical mechanisms. Here we measure light scattering and emission in tungsten diselenide monolayers close to the laser excitation energy (down to ~0.6 meV). We reveal a series of periodic maxima in the hot photoluminescence intensity, stemming from energy states higher than the A-exciton state. We find a period ~15 meV for 7 peaks below (Stokes) and 5 peaks above (anti-Stokes) the laser excitation energy, with a strong temperature dependence. These are assigned to phonon cascades, whereby carriers undergo phonon-induced transitions between real states above the free-carrier gap with a probability of radiative recombination at each step. We infer that intermediate states in the conduction band at the Λ-valley of the Brillouin zone participate in the cascade process of tungsten diselenide monolayers. This provides a fundamental understanding of the first stages of carrier–phonon interaction, useful for optoelectronic applications of layered semiconductors.

Date: 2021
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DOI: 10.1038/s41467-020-20244-7

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