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Valley-selective exciton bistability in a suspended monolayer semiconductor

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arxiv 1803.04067 v1 pith:TF4K7DKY submitted 2018-03-12 cond-mat.mes-hall

Hongchao Xie , Shengwei Jiang , Jie Shan , Kin Fai Mak This is my paper
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keywords bistabilityopticalexcitonsuspendedunderachievedbecomesbeen
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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 10^3 W/cm^2. 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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