Dispersion of the resonant second order nonlinearity in 2D semiconductors probed by femtosecond continuum pulses | Zendy

Mohammad Mokim | Zendy; Adam Card | Zendy; Bindeshwar Sah | Zendy; Feruz Ganikhanov | Zendy

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Dispersion of the resonant second order nonlinearity in 2D semiconductors probed by femtosecond continuum pulses

Author(s) -

Mohammad Mokim,

Adam Card,

Bindeshwar Sah,

Feruz Ganikhanov

Publication year - 2017

Publication title -

aip advances

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.421

H-Index - 58

ISSN - 2158-3226

DOI - 10.1063/1.5006794

Subject(s) - tungsten diselenide , femtosecond , dispersion (optics) , exciton , photon energy , semiconductor , materials science , monolayer , atomic physics , nonlinear optics , molecular physics , optics , band gap , photon , condensed matter physics , chemistry , optoelectronics , physics , laser , nanotechnology , transition metal , catalysis , biochemistry

We demonstrate an effective microspectroscopy technique by tracing the dispersion of second order nonlinear susceptibility (χ(2)) in a monolayer tungsten diselenide (WSe2). The χ(2) dispersion obtained with better than 3 meV photon energy resolution showed peak value being within 6.3-8.4×10-19 m2/V range. We estimate the fundamental bandgap to be at 2.2 eV. Sub-structure in the χ(2) dispersion reveals a contribution to the nonlinearity due to exciton transitions with exciton binding energy estimated to be at 0.7 eV

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