Quantized beam shifts in graphene

TL;DR

This paper predicts quantized optical beam shifts in a graphene system under magnetic field, revealing potential for experimental observation at terahertz frequencies and advancing understanding of light-matter interactions in quantum regimes.

Contribution

It introduces the prediction of quantized Imbert-Fedorov, Goos-H"anchen, and spin Hall shifts in graphene under magnetic fields, highlighting their dependence on fundamental constants.

Findings

Imbert-Fedorov and spin Hall shifts are quantized in multiples of α.

Goos-H"anchen shifts are quantized in multiples of α².

Quantized shifts are observable at terahertz frequencies with moderate magnetic fields.

Abstract

We predict quantized Imbert-Fedorov, Goos-H\"anchen, and photonic spin Hall shifts for light beams impinging on a graphene-on-substrate system in an external magnetic field. In the quantum Hall regime the Imbert-Fedorov and photonic spin Hall shifts are quantized in integer multiples of the fine structure constant $\alpha$, while the Goos- H\"anchen ones in multiples of $\alpha^2$. We investigate the influence on these shifts of magnetic field, temperature, and material dispersion and dissipation. An experimental demonstration of quantized beam shifts could be achieved at terahertz frequencies for moderate values of the magnetic field.