2000 character limit reached
Valley-selective exciton bistability in a suspended monolayer semiconductor
Published 12 Mar 2018 in cond-mat.mes-hall | (1803.04067v1)
Abstract: We demonstrate robust power- and wavelength-dependent optical bistability in fully suspended monolayers of WSe2 near the exciton resonance. Bistability has been achieved under continuous-wave optical excitation at an intensity level of 103 W/cm2. The observed bistability is originated from a photo-thermal mechanism, which provides both optical nonlinearity and passive feedback, two essential elements for optical bistability. Under a finite magnetic field, the exciton bistability becomes helicity dependent, which enables repeatable switching of light purely by its polarization.
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