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Title: Optical control of charged exciton states in tungsten disulfide

A method is presented for optically preparing WS{sub 2} monolayers to luminescence from only the charged exciton (trion) state–completely suppressing the neutral exciton. When isolating the trion state, we observed changes in the Raman A{sub 1g} intensity and an enhanced feature on the low energy side of the E{sup 1}{sub 2g} peak. Photoluminescence and optical reflectivity measurements confirm the existence of the prepared trion state. This technique also prepares intermediate regimes with controlled luminescence amplitudes of the neutral and charged exciton. This effect is reversible by exposing the sample to air, indicating the change is mitigated by surface interactions with the ambient environment. This method provides a tool to modify optical emission energy and to isolate physical processes in this and other two-dimensional materials.
Authors:
; ;  [1] ;  [2] ;  [3]
  1. Naval Research Laboratory, Washington, DC 20375 (United States)
  2. University of Crete, Heraklion, Crete 71003 (Greece)
  3. (IESL), Foundation for Research and Technology Hellas (FORTH), Heraklion, Crete 71110 (Greece)
Publication Date:
OSTI Identifier:
22402453
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 106; Journal Issue: 20; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; EXCITONS; LAYERS; PHOTOLUMINESCENCE; REFLECTIVITY; SURFACES; TUNGSTEN SULFIDES; TWO-DIMENSIONAL SYSTEMS