Cavity quantum electrodynamical Chern insulator: Towards light-induced quantized anomalous Hall effect in graphene

Wang, Xiao; Ronca, Enrico; Sentef, Michael A.

doi:10.1103/physrevb.99.235156

Cited by 77 publications

(43 citation statements)

References 73 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As an alternative route towards engineering topological magnon edge states with light, non-classical photon fields in cavities can be employed to control magnetic exchange interactions [77,78] and induce nontrivial topology with chiral light modes [79,80]. We also envisage the possibility to combine optical engineering with the control offered by bilayer Moiré systems [81] to induce and control topological magnons.…”

Section: Discussionmentioning

confidence: 99%

Light-induced topological magnons in two-dimensional van der Waals magnets

et al. 2020

View full text Add to dashboard Cite

Driving a two-dimensional Mott insulator with circularly polarized light breaks time-reversal and inversion symmetry, which induces an optically-tunable synthetic scalar spin chirality interaction in the effective low-energy spin Hamiltonian. Here, we show that this mechanism can stabilize topological magnon excitations in honeycomb ferromagnets and in optical lattices. We find that the irradiated quantum magnet is described by a Haldane model for magnons that hosts topologically-protected edge modes. We study the evolution of the magnon spectrum in the Floquet regime and via time propagation of the magnon Hamiltonian for a slowly varying pulse envelope. Compared to similar but conceptually distinct driving schemes based on the Aharanov-Casher effect, the dimensionless light-matter coupling parameter \lambda = eEa/\hbar\omegaλ=eEa/ℏω at fixed electric field strength is enhanced by a factor \sim 10^5∼105. This increase of the coupling parameter allows to induce a topological gap of the order of \Delta \approx 2Δ≈2 meV with realistic laser pulses, bringing an experimental realization of light-induced topological magnon edge states within reach.

show abstract

Section: Discussionmentioning

confidence: 99%

Light-induced topological magnons in two-dimensional van der Waals magnets

et al. 2020

View full text Add to dashboard Cite

show abstract

“…We stress here that the electron Berry curvature emerges solely due to the electron-photon coupling. This effect is thus essentially different to the recently proposed quantum Hall effect for the graphene sheet in a magnetic cavity [18,34]. In the case of graphene, the electronic bands are initially characterized by the non-vanishing curvature, and the role of the cavity is limited to the opening of the gap in the Dirac point.…”

mentioning

confidence: 54%

Vacuum anomalous Hall effect in gyrotropic cavity

Tokatly,

Gulevich,

Iorsh

2021

Preprint

View full text Add to dashboard Cite

“…In this case the band gap induced initially by a moderate field amplitude could close again leading to a second topological phase transition, which should lead to a signature in the Hall transport experiment. Moreover it is also interesting to address the question of light-induced topology without classical driving fields by encapsulating TBG in a cavity, as recently proposed for single-layer graphene [71].…”

Section: Discussionmentioning

confidence: 99%

Topological Floquet engineering of twisted bilayer graphene

Topp

Jotzu

McIver

et al. 2019

Phys. Rev. Research

Self Cite

View full text Add to dashboard Cite

We investigate the topological properties of Floquet-engineered twisted bilayer graphene above the magic angle driven by circularly polarized laser pulses. Employing a full Moiré-unit-cell tightbinding Hamiltonian based on first-principles electronic structure we show that the band topology in the bilayer, at twisting angles above 1.05 • , essentially corresponds to the one of single-layer graphene. However, the ability to open topologically trivial gaps in this system by a bias voltage between the layers enables the full topological phase diagram to be explored, which is not possible in singlelayer graphene. Circularly polarized light induces a transition to a topologically nontrivial Floquet band structure with the Berry curvature of a Chern insulator. Importantly, the twisting allows for tuning electronic energy scales, which implies that the electronic bandwidth can be tailored to match realistic driving frequencies in the ultraviolet or mid-infrared photon-energy regimes. This implies that Moiré superlattices are an ideal playground for combining twistronics, Floquet engineering, and strongly interacting regimes out of thermal equilibrium.

show abstract

Cavity quantum electrodynamical Chern insulator: Towards light-induced quantized anomalous Hall effect in graphene

Cited by 77 publications

References 73 publications

Light-induced topological magnons in two-dimensional van der Waals magnets

Light-induced topological magnons in two-dimensional van der Waals magnets

Vacuum anomalous Hall effect in gyrotropic cavity

Topological Floquet engineering of twisted bilayer graphene

Contact Info

Product

Resources

About