Optical control of charged exciton states in tungsten disulfide

Journal Article · Mon May 18 00:00:00 EDT 2015 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4921472· OSTI ID:22402453

Currie, M.; Hanbicki, A. T.; Jonker, B. T. ^[1]; Kioseoglou, G. ^[2]

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1. Naval Research Laboratory, Washington, DC 20375 (United States)
2. University of Crete, Heraklion, Crete 71003 (Greece)

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.

• OSTI ID: 22402453
• Journal Information: Applied Physics Letters, Vol. 106, Issue 20; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
EXCITONS
LAYERS
PHOTOLUMINESCENCE
REFLECTIVITY
SURFACES
TUNGSTEN SULFIDES
TWO-DIMENSIONAL SYSTEMS