Apr 20, 2015 · Here, we demonstrate the electrical control of SHG intensity in a monolayer WSe 2 field-effect transistor, where the tunable SHG arises from the resonant responses of neutral and charged...

Jan 7, 2019 · Quantum interference, probed by second-harmonic generation 18, 19, emerges in monolayer WSe 2, without a cavity, to split the frequency-doubled laser spectrum. The splitting exhibits spectral...

Dec 16, 2015 · In this work, we perform SHG analysis in mono- and few-layer WSe 2 at ambient temperature and for a single excitation wavelength. Raman spectroscopy and photoluminescence measurements are used to verify the presence of monolayer WSe 2.

Mar 4, 2015 · We perform second harmonic generation (SHG) spectroscopy as a function of laser energy and polarization at T = 4 K. At the exciton resonance energies we record an enhancement by up to 3 orders of magnitude of the SHG efficiency, due to the unusual combination of electric dipole and magnetic dipole transitions.

Jun 22, 2020 · Here we report evidence of low-energy flat bands in twisted bilayer WSe 2, with signatures of collective phases observed over twist angles that range from 4 to 5.1°. At half-band filling, a...

Nov 11, 2024 · Current approaches to SHG control often depend on nonresonant conditions or symmetry breaking via single-gate control. Here, we employ dual-gate bilayer WSe 2 to demonstrate an SHG enhancement concept that leverages strong exciton resonance and a layer-dependent exciton-polaron effect.

Jul 23, 2015 · Here we report a strong second-harmonic generation (SHG) in a 2D WSe 2 bilayer crystal caused by a back gate field. This unusual process takes place only when the gate polarity causes charge accumulation rather than depletion.

Here we demonstrate that plasmonically generated hot electrons can be injected from plasmonic nanostructure into bilayer (2L) tungsten diselenide (WSe 2), breaking the material inversion symmetry and thus inducing an SHG.

Jul 1, 2024 · Current approaches to SHG control often depend on non-resonant conditions or symmetry breaking via single-gate control. Here, we employ dual-gate bilayer WSe2 to demonstrate a new SHG enhancement concept that leverages strong exciton resonance and layer-dependent exciton-polaron effect.

Nov 23, 2018 · Quantum interference, probed by second-harmonic generation (SHG), emerges in monolayer WSe2, without a cavity, splitting the SHG spectrum. The splitting exhibits spectral anticrossing behaviour, and is related to the number of …