Exciton-polaritons in multilayer WSe2 in a planar microcavity

Mateusz Król; Katarzyna Rechcińska; Karol Nogajewski; Magdalena Grzeszczyk; Karolina Łempicka; Rafał Mirek; Sara Piotrowska; Kenji Watanabe; Takashi Taniguchi; Maciej R. Molas; Marek Potemski; Jacek Szczytko; Barbara Piȩtka

doi:10.1088/2053-1583/ab4b14

Exciton-polaritons in multilayer WSe₂ in a planar microcavity

Mateusz Król, Katarzyna Rechcińska, Karol Nogajewski, Magdalena Grzeszczyk, Karolina Łempicka, Rafał Mirek, Sara Piotrowska, Kenji Watanabe, Takashi Taniguchi, Maciej R. Molas, Marek Potemski, Jacek Szczytko, Barbara Piȩtka

Research output: Contribution to journal › Article › peer-review

19 Citations (Scopus)

Abstract

Due to high binding energy and oscillator strength, excitons in thin flakes of transition metal dichalcogenides constitute a perfect foundation for realizing a strongly coupled light-matter system. In this paper we investigate mono- and few-layer WSe₂ flakes encapsulated in hexagonal boron nitride and incorporated into a planar dielectric cavity. We use an open cavity design which provides tunability of the cavity mode energy by as much as 150 meV. We observe a strong coupling regime between the cavity photons and the neutral excitons in direct-bandgap monolayer WSe₂, as well as in few-layer WSe₂ flakes exhibiting indirect bandgap. We discuss the dependence of the exciton's oscillator strength and resonance linewidth on the number of layers and predict the exciton-photon coupling strength.

Original language	English
Article number	015006
Journal	2D Materials
Volume	7
Issue number	1
DOIs	https://doi.org/10.1088/2053-1583/ab4b14
Publication status	Published - 2020
Externally published	Yes

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title = "Exciton-polaritons in multilayer WSe2 in a planar microcavity",

abstract = "Due to high binding energy and oscillator strength, excitons in thin flakes of transition metal dichalcogenides constitute a perfect foundation for realizing a strongly coupled light-matter system. In this paper we investigate mono- and few-layer WSe2 flakes encapsulated in hexagonal boron nitride and incorporated into a planar dielectric cavity. We use an open cavity design which provides tunability of the cavity mode energy by as much as 150 meV. We observe a strong coupling regime between the cavity photons and the neutral excitons in direct-bandgap monolayer WSe2, as well as in few-layer WSe2 flakes exhibiting indirect bandgap. We discuss the dependence of the exciton's oscillator strength and resonance linewidth on the number of layers and predict the exciton-photon coupling strength.",

keywords = "exciton-polaritons, microcavity, multilayer WSe, strong light-matter coupling, transition metal dichalcogenides",

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note = "Publisher Copyright: {\textcopyright} 2019 IOP Publishing Ltd.",

year = "2020",

doi = "10.1088/2053-1583/ab4b14",

language = "English",

volume = "7",

journal = "2D Materials",

issn = "2053-1583",

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TY - JOUR

T1 - Exciton-polaritons in multilayer WSe2 in a planar microcavity

AU - Król, Mateusz

AU - Rechcińska, Katarzyna

AU - Nogajewski, Karol

AU - Grzeszczyk, Magdalena

AU - Łempicka, Karolina

AU - Mirek, Rafał

AU - Piotrowska, Sara

AU - Watanabe, Kenji

AU - Taniguchi, Takashi

AU - Molas, Maciej R.

AU - Potemski, Marek

AU - Szczytko, Jacek

AU - Piȩtka, Barbara

PY - 2020

Y1 - 2020

N2 - Due to high binding energy and oscillator strength, excitons in thin flakes of transition metal dichalcogenides constitute a perfect foundation for realizing a strongly coupled light-matter system. In this paper we investigate mono- and few-layer WSe2 flakes encapsulated in hexagonal boron nitride and incorporated into a planar dielectric cavity. We use an open cavity design which provides tunability of the cavity mode energy by as much as 150 meV. We observe a strong coupling regime between the cavity photons and the neutral excitons in direct-bandgap monolayer WSe2, as well as in few-layer WSe2 flakes exhibiting indirect bandgap. We discuss the dependence of the exciton's oscillator strength and resonance linewidth on the number of layers and predict the exciton-photon coupling strength.

AB - Due to high binding energy and oscillator strength, excitons in thin flakes of transition metal dichalcogenides constitute a perfect foundation for realizing a strongly coupled light-matter system. In this paper we investigate mono- and few-layer WSe2 flakes encapsulated in hexagonal boron nitride and incorporated into a planar dielectric cavity. We use an open cavity design which provides tunability of the cavity mode energy by as much as 150 meV. We observe a strong coupling regime between the cavity photons and the neutral excitons in direct-bandgap monolayer WSe2, as well as in few-layer WSe2 flakes exhibiting indirect bandgap. We discuss the dependence of the exciton's oscillator strength and resonance linewidth on the number of layers and predict the exciton-photon coupling strength.

KW - exciton-polaritons

KW - microcavity

KW - multilayer WSe

KW - strong light-matter coupling

KW - transition metal dichalcogenides

UR - http://www.scopus.com/inward/record.url?scp=85081962108&partnerID=8YFLogxK

U2 - 10.1088/2053-1583/ab4b14

DO - 10.1088/2053-1583/ab4b14

M3 - Article

SN - 2053-1583

VL - 7

JO - 2D Materials

JF - 2D Materials

IS - 1

M1 - 015006

ER -

Exciton-polaritons in multilayer WSe₂ in a planar microcavity

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