Tunable PL in W-based TMDs probed by optical vortex beam
ORAL
Abstract
Selection rules for optical transitions in monolayer transition metal dichalcogenides are governed by the spin and valley degree of freedom of excitons. The intravalley scattering dynamics is responsible for photoluminescence (PL) quenching in WS2 and WSe2 at low temperature. The PL intensity of bright exciton at steady state is determined by intravalley scattering rate between bright and dark exciton states. In this work we propose a technique to probe the PL spectrum of monolayer W-based TMDs via photo excitation utilizing optical vortex beam and investigate the effect of intravalley scattering.
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Presenters
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Aswini K Pattanayak
Indian Institute of Technology Kharagpur, Indian Institute of Technology, Kharagpur
Authors
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Aswini K Pattanayak
Indian Institute of Technology Kharagpur, Indian Institute of Technology, Kharagpur
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Pritam Das
Indian Institute of Technology, Kharagpur
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Devarshi Chakrabarty
Indian Institute of Technology Kharagpur, Indian Institute of Technology, Kharagpur
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Avijit Dhara
Indian Institute of Technology Kharagpur, Indian Institute of Technology, Kharagpur
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Shreya Paul
Indian Institute of Technology, Kharagpur
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Maruthi M Brundavanam
Indian Institute of Technology, Kharagpur
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Sajal Dhara
Indian Institute of Technology Kharagpur, Indian Institute of Technology, Kharagpur