Optical beam shifts in graphene and single-layer boron-nitride

TL;DR

This paper investigates optical beam shifts in free-standing two-dimensional atomic crystals like graphene and boron nitride, revealing unique dependencies on surface susceptibility rather than wavelength.

Contribution

It provides a theoretical analysis of beam shifts in 2D crystals, highlighting differences from 3D crystals and emphasizing the role of surface susceptibility.

Findings

Goos-H"anchen shift depends on surface susceptibility, not wavelength

Imbert-Fedorov and angular shifts depend on wavelength and beam aperture

Surface conductivity has a secondary effect on beam shifts

Abstract

Optical beam shifts from a free-standing two-dimensional atomic crystal are investigated. In contrast to a three-dimensional crystal the magnitude of the Goos-H$\rm \ddot{a}$nchen shift depends on the surface susceptibility of the crystal and not on the wavelength of the incident light beam. The surface conductivity of the atomically thin crystal is less important in this context because it enters in the expression of the shifts only as a second order parameter. In analogy to a three-dimensional crystal the magnitudes of the Imbert-Fedorov shift and of the angular shifts depend respectively on the wavelength and on the square of the beam angular aperture.