Temperature dependent moiré trapping of interlayer excitons in MoSe2-WSe2 heterostructures

Fateme Mahdikhanysarvejahany; Daniel N. Shanks; Christine Muccianti; Bekele H. Badada; Ithwun Idi; Adam Alfrey; Sean Raglow; Michael R. Koehler; David G. Mandrus; Takashi Taniguchi; Kenji Watanabe; Oliver L.A. Monti; Hongyi Yu; Brian J. LeRoy; John R. Schaibley

doi:10.1038/s41699-021-00248-7

Temperature dependent moiré trapping of interlayer excitons in MoSe₂-WSe₂ heterostructures

Fateme Mahdikhanysarvejahany, Daniel N. Shanks, Christine Muccianti, Bekele H. Badada, Ithwun Idi, Adam Alfrey, Sean Raglow, Michael R. Koehler, David G. Mandrus, Takashi Taniguchi, Kenji Watanabe, Oliver L.A. Monti, Hongyi Yu, Brian J. LeRoy, John R. Schaibley

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25 Scopus citations

Abstract

MoSe₂–WSe₂ heterostructures host strongly bound interlayer excitons (IXs), which exhibit bright photoluminescence (PL) when the twist angle is near 0° or 60°. Over the past several years, there have been numerous reports on the optical response of these heterostructures but no unifying model to understand the dynamics of IXs and their temperature dependence. Here we perform a comprehensive study of the temperature, excitation power, and time-dependent PL of IXs. We observe a significant decrease in PL intensity above a transition temperature that we attribute to a transition from localized to delocalized IXs. Astoundingly, we find a simple inverse relationship between the IX PL energy and the transition temperature, which exhibits opposite power-dependent behaviors for near 0° and 60° samples. We conclude that this temperature dependence is a result of IX–IX exchange interactions, whose effect is suppressed by the moiré potential trapping IXs at low temperature.

Original language	English (US)
Article number	67
Journal	npj 2D Materials and Applications
Volume	5
Issue number	1
DOIs	https://doi.org/10.1038/s41699-021-00248-7
State	Published - Dec 2021

ASJC Scopus subject areas

General Chemistry
General Materials Science
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

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Mahdikhanysarvejahany, F., Shanks, D. N., Muccianti, C., Badada, B. H., Idi, I., Alfrey, A., Raglow, S., Koehler, M. R., Mandrus, D. G., Taniguchi, T., Watanabe, K., Monti, O. L. A., Yu, H., LeRoy, B. J., & Schaibley, J. R. (2021). Temperature dependent moiré trapping of interlayer excitons in MoSe₂-WSe₂ heterostructures. npj 2D Materials and Applications, 5(1), Article 67. https://doi.org/10.1038/s41699-021-00248-7

Mahdikhanysarvejahany, F, Shanks, DN, Muccianti, C, Badada, BH, Idi, I, Alfrey, A, Raglow, S, Koehler, MR, Mandrus, DG, Taniguchi, T, Watanabe, K, Monti, OLA, Yu, H, LeRoy, BJ & Schaibley, JR 2021, 'Temperature dependent moiré trapping of interlayer excitons in MoSe₂-WSe₂ heterostructures', npj 2D Materials and Applications, vol. 5, no. 1, 67. https://doi.org/10.1038/s41699-021-00248-7

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title = "Temperature dependent moir{\'e} trapping of interlayer excitons in MoSe2-WSe2 heterostructures",

abstract = "MoSe2–WSe2 heterostructures host strongly bound interlayer excitons (IXs), which exhibit bright photoluminescence (PL) when the twist angle is near 0° or 60°. Over the past several years, there have been numerous reports on the optical response of these heterostructures but no unifying model to understand the dynamics of IXs and their temperature dependence. Here we perform a comprehensive study of the temperature, excitation power, and time-dependent PL of IXs. We observe a significant decrease in PL intensity above a transition temperature that we attribute to a transition from localized to delocalized IXs. Astoundingly, we find a simple inverse relationship between the IX PL energy and the transition temperature, which exhibits opposite power-dependent behaviors for near 0° and 60° samples. We conclude that this temperature dependence is a result of IX–IX exchange interactions, whose effect is suppressed by the moir{\'e} potential trapping IXs at low temperature.",

author = "Fateme Mahdikhanysarvejahany and Shanks, \{Daniel N.\} and Christine Muccianti and Badada, \{Bekele H.\} and Ithwun Idi and Adam Alfrey and Sean Raglow and Koehler, \{Michael R.\} and Mandrus, \{David G.\} and Takashi Taniguchi and Kenji Watanabe and Monti, \{Oliver L.A.\} and Hongyi Yu and LeRoy, \{Brian J.\} and Schaibley, \{John R.\}",

note = "Publisher Copyright: {\textcopyright} 2021, The Author(s).",

year = "2021",

month = dec,

doi = "10.1038/s41699-021-00248-7",

language = "English (US)",

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AU - Mahdikhanysarvejahany, Fateme

AU - Shanks, Daniel N.

AU - Muccianti, Christine

AU - Badada, Bekele H.

AU - Idi, Ithwun

AU - Alfrey, Adam

AU - Raglow, Sean

AU - Koehler, Michael R.

AU - Mandrus, David G.

AU - Taniguchi, Takashi

AU - Watanabe, Kenji

AU - Monti, Oliver L.A.

AU - Yu, Hongyi

AU - LeRoy, Brian J.

AU - Schaibley, John R.

PY - 2021/12

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N2 - MoSe2–WSe2 heterostructures host strongly bound interlayer excitons (IXs), which exhibit bright photoluminescence (PL) when the twist angle is near 0° or 60°. Over the past several years, there have been numerous reports on the optical response of these heterostructures but no unifying model to understand the dynamics of IXs and their temperature dependence. Here we perform a comprehensive study of the temperature, excitation power, and time-dependent PL of IXs. We observe a significant decrease in PL intensity above a transition temperature that we attribute to a transition from localized to delocalized IXs. Astoundingly, we find a simple inverse relationship between the IX PL energy and the transition temperature, which exhibits opposite power-dependent behaviors for near 0° and 60° samples. We conclude that this temperature dependence is a result of IX–IX exchange interactions, whose effect is suppressed by the moiré potential trapping IXs at low temperature.

AB - MoSe2–WSe2 heterostructures host strongly bound interlayer excitons (IXs), which exhibit bright photoluminescence (PL) when the twist angle is near 0° or 60°. Over the past several years, there have been numerous reports on the optical response of these heterostructures but no unifying model to understand the dynamics of IXs and their temperature dependence. Here we perform a comprehensive study of the temperature, excitation power, and time-dependent PL of IXs. We observe a significant decrease in PL intensity above a transition temperature that we attribute to a transition from localized to delocalized IXs. Astoundingly, we find a simple inverse relationship between the IX PL energy and the transition temperature, which exhibits opposite power-dependent behaviors for near 0° and 60° samples. We conclude that this temperature dependence is a result of IX–IX exchange interactions, whose effect is suppressed by the moiré potential trapping IXs at low temperature.

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Temperature dependent moiré trapping of interlayer excitons in MoSe₂-WSe₂ heterostructures

Abstract

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