skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Discrete quantum dot like emitters in monolayer MoSe{sub 2}: Spatial mapping, magneto-optics, and charge tuning

Abstract

Transition metal dichalcogenide monolayers such as MoSe{sub 2}, MoS{sub 2}, and WSe{sub 2} are direct bandgap semiconductors with original optoelectronic and spin-valley properties. Here we report on spectrally sharp, spatially localized emission in monolayer MoSe{sub 2}. We find this quantum dot-like emission in samples exfoliated onto gold substrates and also suspended flakes. Spatial mapping shows a correlation between the location of emitters and the existence of wrinkles (strained regions) in the flake. We tune the emission properties in magnetic and electric fields applied perpendicular to the monolayer plane. We extract an exciton g-factor of the discrete emitters close to −4, as for 2D excitons in this material. In a charge tunable sample, we record discrete jumps on the meV scale as charges are added to the emitter when changing the applied voltage.

Authors:
; ; ; ; ; ;  [1]
  1. Université de Toulouse, INSA-CNRS-UPS, LPCNO, 135 Av. Rangueil, 31077 Toulouse (France)
Publication Date:
OSTI Identifier:
22591528
Resource Type:
Journal Article
Journal Name:
Applied Physics Letters
Additional Journal Information:
Journal Volume: 108; Journal Issue: 14; Other Information: (c) 2016 Author(s); Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0003-6951
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; EMISSION; EXCITONS; GOLD; LANDE FACTOR; MAPPING; MEV RANGE; MOLYBDENUM SELENIDES; MOLYBDENUM SULFIDES; OPTICS; QUANTUM DOTS; SEMICONDUCTOR MATERIALS; SILICON OXIDES; SPIN; TUNING

Citation Formats

Branny, Artur, Kumar, Santosh, Gerardot, Brian D., E-mail: b.d.gerardot@hw.ac.uk, Wang, Gang, Robert, Cedric, Lassagne, Benjamin, Marie, Xavier, and Urbaszek, Bernhard. Discrete quantum dot like emitters in monolayer MoSe{sub 2}: Spatial mapping, magneto-optics, and charge tuning. United States: N. p., 2016. Web. doi:10.1063/1.4945268.
Branny, Artur, Kumar, Santosh, Gerardot, Brian D., E-mail: b.d.gerardot@hw.ac.uk, Wang, Gang, Robert, Cedric, Lassagne, Benjamin, Marie, Xavier, & Urbaszek, Bernhard. Discrete quantum dot like emitters in monolayer MoSe{sub 2}: Spatial mapping, magneto-optics, and charge tuning. United States. doi:10.1063/1.4945268.
Branny, Artur, Kumar, Santosh, Gerardot, Brian D., E-mail: b.d.gerardot@hw.ac.uk, Wang, Gang, Robert, Cedric, Lassagne, Benjamin, Marie, Xavier, and Urbaszek, Bernhard. Mon . "Discrete quantum dot like emitters in monolayer MoSe{sub 2}: Spatial mapping, magneto-optics, and charge tuning". United States. doi:10.1063/1.4945268.
@article{osti_22591528,
title = {Discrete quantum dot like emitters in monolayer MoSe{sub 2}: Spatial mapping, magneto-optics, and charge tuning},
author = {Branny, Artur and Kumar, Santosh and Gerardot, Brian D., E-mail: b.d.gerardot@hw.ac.uk and Wang, Gang and Robert, Cedric and Lassagne, Benjamin and Marie, Xavier and Urbaszek, Bernhard},
abstractNote = {Transition metal dichalcogenide monolayers such as MoSe{sub 2}, MoS{sub 2}, and WSe{sub 2} are direct bandgap semiconductors with original optoelectronic and spin-valley properties. Here we report on spectrally sharp, spatially localized emission in monolayer MoSe{sub 2}. We find this quantum dot-like emission in samples exfoliated onto gold substrates and also suspended flakes. Spatial mapping shows a correlation between the location of emitters and the existence of wrinkles (strained regions) in the flake. We tune the emission properties in magnetic and electric fields applied perpendicular to the monolayer plane. We extract an exciton g-factor of the discrete emitters close to −4, as for 2D excitons in this material. In a charge tunable sample, we record discrete jumps on the meV scale as charges are added to the emitter when changing the applied voltage.},
doi = {10.1063/1.4945268},
journal = {Applied Physics Letters},
issn = {0003-6951},
number = 14,
volume = 108,
place = {United States},
year = {2016},
month = {4}
}