Direct and Indirect Interlayer Excitons in a van der Waals Heterostructure of hBN/WS2 /MoS2 /hBN

ACS Nano
Mitsuhiro OkadaRyo Kitaura

Abstract

A van der Waals (vdW) heterostructure composed of multivalley systems can show excitonic optical responses from interlayer excitons that originate from several valleys in the electronic structure. In this work, we studied photoluminescence (PL) from a vdW heterostructure, WS2/MoS2, deposited on hexagonal boron nitride (hBN) flakes. PL spectra from the fabricated heterostructures observed at room temperature show PL peaks at 1.3-1.7 eV, which are absent in the PL spectra of WS2 or MoS2 monolayers alone. The low-energy PL peaks we observed can be decomposed into three distinct peaks. Through detailed PL measurements and theoretical analysis, including PL imaging, time-resolved PL measurements, and calculation of dielectric function ε(ω) by solving the Bethe-Salpeter equation with G0 W0, we concluded that the three PL peaks originate from direct K-K interlayer excitons, indirect Q-Γ interlayer excitons, and indirect K-Γ interlayer excitons.

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Citations

Jul 26, 2018·Chemical Society Reviews·Ki Kang KimYoung Hee Lee
Jul 31, 2018·Chemical Society Reviews·Zhiwei WangWei Huang
Mar 13, 2020·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Durgesh Kumar SharmaSushil Auluck
Apr 4, 2020·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Thorsten DeilmannUrsula Wurstbauer
Jun 14, 2020·Nature Communications·Sunny GuptaBoris I Yakobson
Jan 31, 2021·International Journal of Molecular Sciences·Tao HanZhandong Li
Mar 27, 2021·ACS Nano·Feng HeYaguo Wang
Apr 4, 2021·Light, Science & Applications·Ying JiangAnlian Pan
Jul 17, 2021·Nano Letters·Keisuke ShinokitaKazunari Matsuda
Jul 10, 2021·The Journal of Physical Chemistry. a·Evgeni S PenevBoris I Yakobson
Dec 29, 2020·Nano Letters·Jun-Jie ZhangBoris I Yakobson
Jul 3, 2020·Journal of the American Chemical Society·Lingli HuangThuc Hue Ly
Sep 19, 2018·ACS Nano·Sunny GuptaBoris I Yakobson
Dec 12, 2018·Nano Letters·Sunny GuptaBoris I Yakobson
Sep 26, 2021·Advanced Materials·Soumyabrata RoyPulickel M Ajayan

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