Abstract

We report the direct experimental evidence of the photonic spin Hall shift (PSHS) in monolayer ${\rm{Mo}}{{\rm{S}}_2}$ for a fundamental Gaussian beam via a weak measurement scheme involving definite preselection and postselection spin states. We find that the PSHS is largely dependent on the angle of incidence, postselection angles, and polarization states along with specific ways of interaction of the light with the ${\rm{Mo}}{{\rm{S}}_2}$ surface. Our findings reveal a unique signature linking angular positions at which the spin Hall shifts (SHS) (zero crossing) with the discontinuity in the phase difference (${\phi _P} - {\phi _S}$) of the reflection coefficients further establishing the connection of the PSHS to the geometric phases of the light. An effective theoretical model is applied to confirm the experimental measurements. This paper, thus, deepens our understanding of the tiny spin-dependent splitting in monolayer ${\rm{Mo}}{{\rm{S}}_2}$, opening a new, to the best of our knowledge, avenue for the practical applications of the PSHSs.

© 2022 Optica Publishing Group

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