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Optical flux pump in the quantum Hall regime

TitleOptical flux pump in the quantum Hall regime
Publication TypeJournal Article
Year of Publication2021
AuthorsB. Cao, T. Grass, G. Solomon, and M. Hafezi
JournalPhys. Rev. B
Volume103
Date PublishedJUN 28
Type of ArticleArticle
ISSN2469-9950
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.

DOI10.1103/PhysRevB.103.L241301