Giant Valley-Zeeman Splitting from Spin-Singlet and Spin-Triplet Interlayer Excitons in WSe2/MoSe2 Heterostructure

Wang, Tianmeng; Miao, Shengnan; Li, Zhipeng; Meng, Yuze; Lu, Zhengguang; Lian, Zhen; Blei, Mark; Taniguchi, Takashi; Watanabe, Kenji; Tongay, Sefaattin; Smirnov, Dmitry; Shi, Su-Fei

doi:10.1021/acs.nanolett.9b04528

Title: Giant Valley-Zeeman Splitting from Spin-Singlet and Spin-Triplet Interlayer Excitons in WSe2/MoSe2 Heterostructure

Journal Article · 22 December 2019 · Nano Letters

DOI: https://doi.org/10.1021/acs.nanolett.9b04528 · OSTI ID:1800506

Wang, Tianmeng ^[1]; Miao, Shengnan ^[2];

^[2]; Meng, Yuze ^[2]; Lu, Zhengguang ^[3]; Lian, Zhen ^[2]; Blei, Mark ^[4]; Taniguchi, Takashi ^[5]; Watanabe, Kenji ^[5];

^[5];

^[3];

^[2]

Rensselaer Polytechnic Inst., Troy, NY (United States); OSTI
Rensselaer Polytechnic Inst., Troy, NY (United States)
Florida State Univ., Tallahassee, FL (United States). National High Magnetic Field Lab. (MagLab)
Arizona State Univ., Tempe, AZ (United States)
National Institute for Materials Science (Japan)

Transition metal dichalcogenides (TMDCs) heterostructure with a type II alignment hosts unique interlayer excitons with the possibility of spin-triplet and spin-singlet states. However, the associated spectroscopy signatures remain elusive, strongly hindering the understanding of the Moiré potential modulation of the interlayer exciton. In this work, we unambiguously identify the spin-singlet and spin-triplet interlayer excitons in the WSe2/MoSe2 heterobilayer with a 60° twist angle through the gate- and magnetic field-dependent photoluminescence spectroscopy. Both the singlet and triplet interlayer excitons show giant valley-Zeeman splitting between the K and K" valleys, a result of the large Landé g-factor of the singlet interlayer exciton and triplet interlayer exciton, which are experimentally determined to be ~10.7 and ~15.2, respectively, which is in good agreement with theoretical expectation. The photoluminescence (PL) from the singlet and triplet interlayer excitons show opposite helicities, determined by the atomic registry. Helicity-resolved photoluminescence excitation (PLE) spectroscopy study shows that both singlet and triplet interlayer excitons are highly valley-polarized at the resonant excitation with the valley polarization of the singlet interlayer exciton approaching unity at ~20 K. The highly valley-polarized singlet and triplet interlayer excitons with giant valley-Zeeman splitting inspire future applications in spintronics and valleytronics.

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Research Organization:: Florida State University, Tallahassee, FL (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: FG02-07ER46451

OSTI ID:: 1800506

Journal Information:: Nano Letters, Journal Name: Nano Letters Journal Issue: 1 Vol. 20; ISSN 1530-6984

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Giant Valley-Zeeman Splitting from Spin-Singlet and Spin-Triplet Interlayer Excitons in WSe2/MoSe2 Heterostructure

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