Light-induced anomalous Hall effect in graphene

By J. McIver, B. Schulte, Falk-Ulrich Stein, T. Matsuyama, G. Jotzu, Guido Meier, A. Cavalleri. Nature Physics, 2018

852 citations recorded by the source corpus.

Many non-equilibrium phenomena have been discovered or predicted in optically driven quantum solids1. Examples include light-induced superconductivity2,3 and Floquet-engineered topological phases4–8. These are short-lived effects that should lead to measurable changes in electrical transport, which can be characterized using an ultrafast device architecture based on photoconductive switches9. Here, we report the observation of a light-induced anomalous Hall effect in monolayer graphene driven by a femtosecond pulse of circularly polarized light. The dependence of the effect on a gate potential used to tune the Fermi level reveals multiple features that reflect a Floquet-engineered topological band structure4,5, similar to the band structure originally proposed by Haldane10. This includes an approximately 60 meV wide conductance plateau centred at the Dirac point, where a gap of equal magnitude is predicted to open. We find that when the Fermi level lies within this plateau the estimated anomalous Hall conductance saturates around 1.8 ± 0.4 e2/h. A transient topological response in graphene is driven by a short pulse of light. When the Fermi energy is in the predicted band gap the Hall conductance is around two conductance quanta. An ultrafast detection technique enables the measurement.

Subfields: Atomic and Molecular Physics, and Optics, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/1fec45245d19af182ebc953144d58f907028f6dc

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Atomic and Molecular Physics, and Optics

In Materials Chemistry

Citations in the corpus

Realization of an anomalous Floquet topological system with ultracold atoms (2020, background): “[9] J.”
Photocurrent as a multiphysics diagnostic of quantum materials (2022, methodology): “McIver et al.(121) instead circumvented this by using an ultrafast time-domain photocurrent technique.”
Quantum Electrodynamic Control of Matter: Cavity-Enhanced Ferroelectric Phase Transition (2020, background): “Other seminal works studying control of matter by light include Floquet engineering of electronic band structures [8–12], and photo-induced pumping by ultrashort laser pulses for creating metastable nonequilibrium states [13–28].”