Light-enhanced nonlinear Hall effect

Abstract

It is well known that a nontrivial Chern number results in quantized Hall conductance. What is less known is that, generically, the Hall response can be dramatically different from its quantized value in materials with broken inversion symmetry. This stems from the leading Hall contribution beyond the linear order, known as the Berry curvature dipole (BCD). While the BCD is in principle always present, it is typically very small outside of a narrow window close to a topological transition and is thus experimentally elusive without careful tuning of external fields, temperature, or impurities. In this work, we transcend this challenge by devising optical driving and quench protocols that enable practical and direct access to large BCD and nonlinear Hall responses. Varying the amplitude of an incident circularly polarized laser drives a topological transition between normal and Chern insulator phases, and importantly allows the precise unlocking of nonlinear Hall currents comparable to or larger than the linear Hall contributions. This strong BCD engineering is even more versatile with our two-parameter quench protocol, as demonstrated in our experimental proposal. Our predictions are expected to hold qualitatively across a broad range of Hall materials, thereby paving the way for the controlled engineering of nonlinear electronic properties in diverse media.

25 pages, 9 figures, updated references, published version

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Cited by in corpus (7)

• Floquet engineering of topological phase transitions in quantum spin Hall $\alpha$-$T_3$ system
• Transverse Cooper-Pair Rectifier
• Nonlinear Hall effects with an exceptional ring
• Five-dimensional Floquet topological semimetals with emergent Yang monopoles and linked Weyl surfaces
• Valley Gapless Semiconductor: Models and Applications
• Emergent Weyl-like points in periodically modulated systems
• Intervalley Band Crossing and Transition of Fractional Chern Insulators in Floquet Twisted Bilayer MoTe${}_2$