Twist-angle dependence of moiré excitons in WS2/MoSe2 heterobilayers

Zhang, Long; Zhang, Zhe; Wu, Fengcheng; Wang, Danqing; Gogna, Rahul; Hou, Shaocong; Watanabe, Kenji; Taniguchi, Takashi; Kulkarni, Krishnamurthy; Kuo, Thomas; Forrest, Stephen R.; Deng, Hui

doi:10.1038/s41467-020-19466-6

Twist-angle dependence of moiré excitons in WS₂/MoSe₂ heterobilayers

Journal Article · Tue Nov 17 23:00:00 EST 2020 · Nature Communications

DOI:https://doi.org/10.1038/s41467-020-19466-6· OSTI ID:1817085

^[1]; Zhang, Zhe ^[2]; ^[3]; Wang, Danqing ^[4]; Gogna, Rahul ^[4]; Hou, Shaocong ^[4]; ^[5]; ^[5]; ^[4]; Kuo, Thomas ^[4]; ^[4]; ^[4]

Univ. of Michigan, Ann Arbor, MI (United States); OSTI
Univ. of Michigan, Ann Arbor, MI (United States); Fudan Univ., Shanghai (China)
Univ. of Maryland, College Park, MD (United States)
Univ. of Michigan, Ann Arbor, MI (United States)
National Institute for Materials Science (NIMS), Tsukuba (Japan)

Moiré lattices formed in twisted van der Waals bilayers provide a unique, tunable platform to realize coupled electron or exciton lattices unavailable before. While twist angle between the bilayer has been shown to be a critical parameter in engineering the moiré potential and enabling novel phenomena in electronic moiré systems, a systematic experimental study as a function of twist angle is still missing. Here we show that not only are moiré excitons robust in bilayers of even large twist angles, but also properties of the moiré excitons are dependant on, and controllable by, the moiré reciprocal lattice period via twist-angle tuning. From the twist-angle dependence, we furthermore obtain the effective mass of the interlayer excitons and the electron inter-layer tunneling strength, which are difficult to measure experimentally otherwise. These findings pave the way for understanding and engineering rich moiré-lattice induced phenomena in angle-twisted semiconductor van der Waals heterostructures.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of Maryland, College Park, MD (United States); Univ. of Michigan, Ann Arbor, MI (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF); US Army Research Office (ARO); US Air Force Office of Scientific Research (AFOSR); Japan Society for the Promotion of Science (JSPS)

Grant/Contract Number:: SC0017971

OSTI ID:: 1817085

Journal Information:: Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 11; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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