Floquet dynamics in light-driven solids

Nuske, Marlon; Broers, Lukas; Schulte, B.; Jotzu, Gregor; Sato, Shunsuke A.; Cavalleri, Andrea; Rubio, Ángel; McIver, James; Mathey, Ludwig

doi:10.1103/physrevresearch.2.043408

Cited by 53 publications

(37 citation statements)

References 40 publications

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“…10(e)], features were observed in the conductance spectrum closely aligned with the opening of the band gaps ∆ 0 and ∆ 1 , as predicted by Floquet theory for their laser pulse parameters. Subsequent numerical studies confirmed that the observed photocurrents originated from the formation of topological Floquet-Bloch bands (Nuske et al, 2020;Sato et al, 2019). These results are an encouraging sign that Floquet-engineered topological edge states are a distinct possibility in optically driven Dirac materials.…”

Section: Dressed Chiral Edge Statessupporting

confidence: 55%

“…While this enhanced complexity is an opportunity for realizing novel material responses, it comes at the cost of increased dissipation, which leads to decoherence due to electron-electron, electron-phonon and other scattering mechanisms. Far stronger optical fields are thereby required to overcome these sources of decoherence in driven solid-state electronic systems (Aeschlimann et al, 2021;Nuske et al, 2020;Sato et al, 2019), which have historically made dressed states difficult to experimentally access.…”

Section: Dressed States Of Nonequilibrium Mattermentioning

confidence: 99%

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Colloquium: Nonthermal pathways to ultrafast control in quantum materials

Torre

Kennes²,

Claassen³

et al. 2021

Rev. Mod. Phys.

293

128

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We review recent progress in utilizing ultrafast light-matter interaction to control the macroscopic properties of quantum materials. Particular emphasis is placed on photoinduced phenomena that do not result from ultrafast heating effects but rather emerge from microscopic processes that are inherently nonthermal in nature. Many of these processes can be described as transient modifications to the free energy landscape resulting from the redistribution of quasiparticle populations, the dynamical modification of coupling strengths and the resonant driving of the crystal lattice. Other pathways result from the coherent dressing of a material's quantum states by the light field. We discuss a selection of recently discovered effects leveraging these mechanisms, as well as the technological advances that led to their discovery. A road map for how the field can harness these nonthermal pathways to create new functionalities is presented.

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Section: Dressed Chiral Edge Statessupporting

confidence: 55%

Section: Dressed States Of Nonequilibrium Mattermentioning

confidence: 99%

Colloquium: Nonthermal pathways to ultrafast control in quantum materials

Torre

Kennes²,

Claassen³

et al. 2021

Rev. Mod. Phys.

293

128

View full text Add to dashboard Cite

show abstract

“…[5] can be recovered quantitatively in this manner, see Ref. [16]. As we point out, the resulting magnitude of the Hall conductivity is not consistent with the assumption that a band insulator state on the Floquet states is formed, which would result in a quantized conductivity that is related to the Chern numbers of the occupied states.…”

Section: Introductionmentioning

confidence: 84%

“…In Ref. [16] we have seen that the Hall conductivity can be approximated by weighting Berry curvature and band velocity with the corresponding band occupations. Since both bands have opposite Berry curvature and band velocity the resulting Hall conductivity vanishes.…”

Section: High-frequency Limitmentioning

confidence: 99%

Frequency dependence of the light-induced Hall effect in dissipative graphene

Nuske,

Mathey

2021

Preprint

Self Cite

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“…In particular, we explore two different effects of a circularly polarized laser field. The first effect is the opening of a topological band gap K at the Dirac points that is a direct consequence of broken time-reversal symmetry [129,[157][158][159][160][161][162]. The second effect is a bandwidth renormalization of the low-energy manifold at the Brillouin zone center , usually referred to as dynamical localization.…”

Section: Floquet Engineeringmentioning

confidence: 99%

Light-matter coupling and quantum geometry in moiré materials

et al. 2021

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Quantum geometry has been identified as an important ingredient for the physics of quantum materials and especially of flat-band systems, such as moiré materials. On the other hand, the coupling between light and matter is of key importance across disciplines and especially for Floquet and cavity engineering of solids. Here we present fundamental relations between light-matter coupling and quantum geometry of Bloch wave functions, with a particular focus on flat-band and moiré materials, in which the quenching of the electronic kinetic energy could allow one to reach the limit of strong light-matter coupling more easily than in highly dispersive systems. We show that, despite the fact that flat bands have vanishing band velocities and curvatures, light couples to them via geometric contributions. Specifically, the intraband quantum metric allows diamagnetic coupling inside a flat band; the interband Berry connection governs dipole matrix elements between flat and dispersive bands. We illustrate these effects in two representative model systems: (i) a sawtooth quantum chain with a single flat band and (ii) a tight-binding model for twisted bilayer graphene. For (i) we highlight the importance of quantum geometry by demonstrating a nonvanishing diamagnetic light-matter coupling inside the flat band. For (ii) we explore the twist-angle dependence of various light-matter coupling matrix elements. Furthermore, at the magic angle corresponding to almost flat bands, we show a Floquet-topological gap opening under irradiation with circularly polarized light despite the nearly vanishing Fermi velocity. We discuss how these findings provide fundamental design principles and tools for light-matter-coupling-based control of emergent electronic properties in flat-band and moiré materials.

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Floquet dynamics in light-driven solids

Cited by 53 publications

References 40 publications

Colloquium: Nonthermal pathways to ultrafast control in quantum materials

Colloquium: Nonthermal pathways to ultrafast control in quantum materials

Frequency dependence of the light-induced Hall effect in dissipative graphene

Light-matter coupling and quantum geometry in moiré materials

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