Abstract

A seminal gedankenexperiment by Laughlin describes the charge transport in quantum Hall systems via the pumping of flux. Here, we propose an optical scheme which probes and manipulates quantum Hall systems in a similar way: When light containing orbital angular momentum interacts with electronic Landau levels, it acts as a flux pump which radially moves the electrons through the sample. We investigate this effect for a graphene system with Corbino geometry and calculate the radial current in the absence of any electric potential bias. Remarkably, the current is robust against the disorder which is consistent with the lattice symmetry, and in the weak excitation limit, the current shows a power-law scaling with intensity characterized by the novel exponent 2/3.

Publication Details
Publication Type
Journal Article
Year of Publication
2021
Volume
103
ISSN Number
2469-9950
DOI
10.1103/PhysRevB.103.L241301
Journal
Phys. Rev. B
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Contributors
Date Published
JUN 28