Localized interlayer excitons in MoSe2–WSe2 heterostructures without a moiré potential

Mahdikhanysarvejahany, Fateme; Shanks, Daniel N.; Klein, Matthew; Wang, Qian; Koehler, Michael R.; Mandrus, David G.; Taniguchi, Takashi; Watanabe, Kenji; Monti, Oliver L. A.; LeRoy, Brian J.; Schaibley, John R.

doi:10.1038/s41467-022-33082-6

Title: Localized interlayer excitons in MoSe₂–WSe₂ heterostructures without a moiré potential

Journal Article · Mon Sep 12 00:00:00 EDT 2022 · Nature Communications

DOI: https://doi.org/10.1038/s41467-022-33082-6 · OSTI ID:2471472

^[1];

^[1]; Klein, Matthew ^[1]; Wang, Qian ^[2]; Koehler, Michael R. ^[3]; Mandrus, David G. ^[4];

^[5];

^[5]; Monti, Oliver L. A. ^[1]; LeRoy, Brian J. ^[1];

^[1]

University of Arizona, Tucson, AZ (United States)
Sun Yat-Sen University, Zhuhai (China)
University of Tennessee, Knoxville, TN (United States)
University of Tennessee, Knoxville, TN (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
National Institute for Materials Science, Tsukuba (Japan)

Interlayer excitons (IXs) in MoSe₂–WSe₂ heterobilayers have generated interest as highly tunable light emitters in transition metal dichalcogenide (TMD) heterostructures. Previous reports of spectrally narrow (<1 meV) photoluminescence (PL) emission lines at low temperature have been attributed to IXs localized by the moiré potential between the TMD layers. We show that spectrally narrow IX PL lines are present even when the moiré potential is suppressed by inserting a bilayer hexagonal boron nitride (hBN) spacer between the TMD layers. We compare the doping, electric field, magnetic field, and temperature dependence of IXs in a directly contacted MoSe₂–WSe₂ region to those in a region separated by bilayer hBN. The doping, electric field, and temperature dependence of the narrow IX lines are similar for both regions, but their excitonic g-factors have opposite signs, indicating that the origin of narrow IX PL is not the moiré potential.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE; National Science Foundation (NSF); Air Force Office of Scientific Research; Army Research Office; Gordon and Betty Moore Foundation; JSPS KAKENHI

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 2471472

Journal Information:: Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 13; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Localized interlayer excitons in MoSe2–WSe2 heterostructures without a moiré potential

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Title: Localized interlayer excitons in MoSe₂–WSe₂ heterostructures without a moiré potential