Circular ac Hall Effect
J. Karch (1), P. Olbrich (1), M. Schmalzbauer (1), C. Zoth (1), C., Brinsteiner (1), M. Fehrenbacher (1), U. Wurstbauer (1), M. M. Glazov (2), S., A. Tarasenko (2), E. L. Ivchenko (2), D. Weiss (1), J. Eroms (1), R. Yakimova, (3), S. Lara-Avila (4), S. Kubatkin (4)
TL;DR
This paper reports the observation of a novel circular ac Hall effect in graphene, where circularly polarized terahertz radiation induces a perpendicular current due to rotating electric and magnetic fields.
Contribution
It introduces the first experimental demonstration of the circular ac Hall effect driven by circularly polarized light in a monolayer graphene sheet.
Findings
Current direction reverses with radiation helicity.
Effect observed at room temperature under oblique incidence.
Current generated without bias voltage.
Abstract
We report the observation of the circular ac Hall effect where the current is solely driven by the crossed ac electric and magnetic fields of circularly polarized radiation. Illuminating an unbiased monolayer sheet of graphene with circularly polarized terahertz radiation at room temperature generates - under oblique incidence - an electric current perpendicular to the plane of incidence, whose sign is reversed by switching the radiation helicity. Alike the classical dc Hall effect, the voltage is caused by crossed electric and magnetic fields which are however rotating with the light's frequency.
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Taxonomy
TopicsQuantum and electron transport phenomena · Graphene research and applications · Quantum, superfluid, helium dynamics