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arXiv · 1908.02043

Precision Measurement of the Optical Conductivity of Atomically Thin Crystals via Photonic Spin Hall Effect

Shizhen Chen·Xiaohui Ling·Weixing Shu·Hailu Luo·Shuangchun Wen
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Abstract

How to measure the optical conductivity of atomically thin crystals is an important but challenging issue due to the weak light-matter interaction at the atomic scale. Photonic spin Hall effect, as a fundamental physical effect in light-matter interaction, is extremely sensitive to the optical conductivity of atomically thin crystals. Here, we report a precision measurement of the optical conductivity of graphene, where the photonic spin Hall effect acts as a measurement pointer. By incorporating with the weak-value amplification technique, the optical conductivity of monolayer graphene taken as a universal constant of $(0.993\pm0.005)σ_0$ is detected, and a high measuring resolution with $1.5\times10^{-8}Ω^{-1}$ is obtained. For few-layer graphene without twist, we find that the conductivities increase linearly with layer number. Our idea could provide an important measurement technique for probing other parameters of atomically thin crystals, such as magneto-optical constant, circular dichroism, and optical nonlinear coefficient.

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Shizhen Chen, Xiaohui Ling, Weixing Shu, Hailu Luo, Shuangchun Wen. 2019-08-06. Precision Measurement of the Optical Conductivity of Atomically Thin Crystals via Photonic Spin Hall Effect. https://doi.org/10.1103/physrevapplied.13.014057

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