Trapping the carrier in the spin-locked MoS2 atomic valley by absorption of chiral L-cysteine

Abstract

This work, demonstrate enhanced valley contrasting spin-momentum locked chiral states at van der Waal interface of chiral L-cysteine and mono-atomically thin MoS2 placed at Si/SiO2 substrate at ambient condition. Helicity dependent photoluminescence and resonance Raman measurement highlights spin-locked transitions for chiral L-cysteine modified SL MoS2 at ambient condition. Selective adsorption of chiral L-cysteine dimer /cystine on monolayer MoS2, stabilizes the in-plane effective magnetic field due to Si/SiO2 substrate and blocks the intervalley spin relaxation. The observed polarisation efficiency will be useful for improving the functionality of valley-based light emitting diode (LEDs) and encoding information in logical devices.