Charge density wave activated excitons in TiSe2–MoSe2 heterostructures

Joshi, Jaydeep; Scharf, Benedikt; Mazin, Igor; Krylyuk, Sergiy; Campbell, Daniel J.; Paglione, Johnpierre; Davydov, Albert; Žutić, Igor; Vora, Patrick M.

doi:10.1063/5.0067098

Title: Charge density wave activated excitons in TiSe₂–MoSe₂ heterostructures

Journal Article · 04 January 2022 · APL Materials

DOI: https://doi.org/10.1063/5.0067098 · OSTI ID:1978962

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George Mason University, Fairfax, VA (United States); George Mason University, Fairfax, Virginia 22030, USA
University of Wurzburg (Germany)
George Mason University, Fairfax, VA (United States)
National Institute of Standards and Technology (NIST), Gaithersburg, MD (United States)
University of Maryland, College Park, MD (United States)
University of Maryland, College Park, MD (United States); Canadian Institute for Advanced Research, Toronto (Canada)
George Mason University, Fairfax, VA (United States); National Institute of Standards and Technology (NIST), Gaithersburg, MD (United States); University of Maryland, College Park, MD (United States)
University at Buffalo, NY (United States)

Layered materials enable the assembly of a new class of heterostructures where lattice-matching is no longer a requirement. Interfaces in these heterostructures therefore become a fertile ground for unexplored physics as dissimilar phenomena can be coupled via proximity effects. In this article, we identify an unexpected photoluminescence (PL) peak when MoSe₂ interacts with TiSe₂. A series of temperature-dependent and spatially resolved PL measurements reveal that this peak is unique to the TiSe₂–MoSe₂ interface, is higher in energy compared to the neutral exciton, and exhibits exciton-like characteristics. The feature disappears at the TiSe₂ charge density wave transition, suggesting that the density wave plays an important role in the formation of this new exciton. We present several plausible scenarios regarding the origin of this peak that individually capture some aspects of our observations but cannot fully explain this feature. These results therefore represent a fresh challenge for the theoretical community and provide a fascinating way to engineer excitons through interactions with charge density waves.

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Research Organization:: State University of New York (SUNY), Albany, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF); George Mason University; Gordon and Betty Moore Foundation

Grant/Contract Number:: SC0004890

OSTI ID:: 1978962

Journal Information:: APL Materials, Journal Name: APL Materials Journal Issue: 1 Vol. 10; ISSN 2166-532X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Title: Charge density wave activated excitons in TiSe2–MoSe2 heterostructures

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Title: Charge density wave activated excitons in TiSe₂–MoSe₂ heterostructures