Probing Exciton Dispersions of Freestanding Monolayer WSe2 by Momentum-Resolved Electron Energy-Loss Spectroscopy

Jinhua Hong; Ryosuke Senga; Thomas Pichler; Kazu Suenaga

doi:10.1103/PhysRevLett.124.087401

Probing Exciton Dispersions of Freestanding Monolayer WSe₂ by Momentum-Resolved Electron Energy-Loss Spectroscopy

Jinhua Hong, Ryosuke Senga, Thomas Pichler, Kazu Suenaga (Corresponding author)

Electronic Properties of Materials

Publications: Contribution to journal › Article › Peer Reviewed

Abstract

Momentum resolved electron energy-loss spectroscopy was used to measure the dispersions of excitons in a free-standing monolayer of WSe2. Besides the parabolically dispersed valley excitons, a sub-gap dispersive exciton was observed at specific q values for the first time. The simultaneous STEM-ADF imaging of the local probed areas suggests that this sub-gap exciton is attributed to the prolific Se vacancies.

Original language	English
Article number	087401
Number of pages	5
Journal	Physical Review Letters
Volume	124
Issue number	8
Early online date	13 Sept 2019
DOIs	https://doi.org/10.1103/PhysRevLett.124.087401
Publication status	Published - 25 Feb 2020

Austrian Fields of Science 2012

103015 Condensed matter

Keywords

cond-mat.mtrl-sci
cond-mat.mes-hall
MOS2
VALLEY POLARIZATION
EMITTERS

Access to Document

10.1103/PhysRevLett.124.087401

https://arxiv.org/abs/1909.06033

Cite this

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title = "Probing Exciton Dispersions of Freestanding Monolayer WSe2 by Momentum-Resolved Electron Energy-Loss Spectroscopy",

abstract = "Momentum resolved electron energy-loss spectroscopy was used to measure the dispersions of excitons in a free-standing monolayer of WSe2. Besides the parabolically dispersed valley excitons, a sub-gap dispersive exciton was observed at specific q values for the first time. The simultaneous STEM-ADF imaging of the local probed areas suggests that this sub-gap exciton is attributed to the prolific Se vacancies.",

keywords = "cond-mat.mtrl-sci, cond-mat.mes-hall, MOS2, VALLEY POLARIZATION, EMITTERS",

author = "Jinhua Hong and Ryosuke Senga and Thomas Pichler and Kazu Suenaga",

note = "Publisher Copyright: {\textcopyright} 2020 American Physical Society.",

year = "2020",

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doi = "10.1103/PhysRevLett.124.087401",

language = "English",

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AU - Hong, Jinhua

AU - Senga, Ryosuke

AU - Pichler, Thomas

AU - Suenaga, Kazu

PY - 2020/2/25

Y1 - 2020/2/25

N2 - Momentum resolved electron energy-loss spectroscopy was used to measure the dispersions of excitons in a free-standing monolayer of WSe2. Besides the parabolically dispersed valley excitons, a sub-gap dispersive exciton was observed at specific q values for the first time. The simultaneous STEM-ADF imaging of the local probed areas suggests that this sub-gap exciton is attributed to the prolific Se vacancies.

AB - Momentum resolved electron energy-loss spectroscopy was used to measure the dispersions of excitons in a free-standing monolayer of WSe2. Besides the parabolically dispersed valley excitons, a sub-gap dispersive exciton was observed at specific q values for the first time. The simultaneous STEM-ADF imaging of the local probed areas suggests that this sub-gap exciton is attributed to the prolific Se vacancies.

KW - cond-mat.mtrl-sci

KW - cond-mat.mes-hall

KW - MOS2

KW - VALLEY POLARIZATION

KW - EMITTERS

UR - https://arxiv.org/abs/1909.06033

UR - http://www.scopus.com/inward/record.url?scp=85081787492&partnerID=8YFLogxK

U2 - 10.1103/PhysRevLett.124.087401

DO - 10.1103/PhysRevLett.124.087401

M3 - Article

SN - 0031-9007

VL - 124

JO - Physical Review Letters

JF - Physical Review Letters

IS - 8

M1 - 087401

ER -

Probing Exciton Dispersions of Freestanding Monolayer WSe₂ by Momentum-Resolved Electron Energy-Loss Spectroscopy

Abstract

Austrian Fields of Science 2012

Keywords

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Electron and Spin Correlations in Nano Carbon-Metal Hybrids

Cite this

Probing Exciton Dispersions of Freestanding Monolayer WSe2 by Momentum-Resolved Electron Energy-Loss Spectroscopy

Abstract

Austrian Fields of Science 2012

Keywords

Access to Document

Other files and links

Projects

Electron and Spin Correlations in Nano Carbon-Metal Hybrids

Cite this

Probing Exciton Dispersions of Freestanding Monolayer WSe₂ by Momentum-Resolved Electron Energy-Loss Spectroscopy