Floquet engineering of topological states in realistic quantum materials via light-matter interactions

Liu, Huan; Cao, Haijun; Meng, Sheng

doi:10.1016/j.progsurf.2023.100705

Cited by 7 publications

(1 citation statement)

References 210 publications

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“…Furthermore, instead of using light as a probe method, one can employ ultrafast light pulses as a control knob to coherently control quantum phases beyond equilibrium on ultrafast time scale. [22,[92][93][94][95] In strongly correlated systems, ultrafast light irradiation could induce long-lived nonequilibrium metastable states, or hidden states of matter such as transient superconductivity, [96][97][98] charge orders [99,100] and lattice configurations, [101][102][103] which are inaccessible from quasistatic stimuli. Generally, light pulses, especially those with high fluence, can even drive new quantum states that do not exist under thermal equilibrium, such as time-periodic Floquet and Volkov states, [104,105] or induce highly nonlinear polarization response in the non-perturbative regime.…”

Section: Introductionmentioning

confidence: 99%

Ultrafast photoemission electron microscopy: A multidimensional probe of nonequilibrium physics

Dai 戴

2024

Chinese Phys. B

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Exploring the realms of physics that extend beyond thermal equilibrium has emerged as a crucial branch of condensed matter physics research. It aims to unravel the intricate processes involving the excitations, interactions, and annihilations of quasi- and many-body particles, and ultimately to achieve the manipulation and engineering of exotic non-equilibrium quantum phases on the ultrasmall and ultrafast spatiotemporal scales. Given the inherent complexities arising from many-body dynamics, it therefore seeks for a technique that has efficient and diverse detection degrees of freedoms to study the underlying physics. By combining high-power femtosecond lasers with real- or momentum-space photoemission electron microscopy (PEEM), imaging excited state phenomena from multiple perspectives, including time, real space, energy, momentum, and spin, can be conveniently achieved, making it a unique technique in studying physics out of equilibrium. In this context, we overview the working principle and technical advances of the PEEM apparatus and the related laser systems, and survey key excited-state phenomena probed through this surface-sensitive methodology, including the ultrafast dynamics of electrons, excitons, plasmons, and spins etc., in materials ranging from bulk and nano-structured metals and semiconductors to low dimensional quantum materials. Through this review, one can further envision that time-resolved PEEM will open new avenues for investigating a variety of classical and quantum phenomena in a multidimensional parameter space, offering unprecedented and comprehensive insights to important questions in the field of condensed matter physics.

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Section: Introductionmentioning

confidence: 99%

Ultrafast photoemission electron microscopy: A multidimensional probe of nonequilibrium physics

Dai 戴

2024

Chinese Phys. B

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Perspective: Floquet engineering topological states from effective models towards realistic materials

Zhan,

Chen,

Ning

et al. 2024

Quantum Front

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With significant advances in classifying and cataloguing topological matter, the focus of topological physics has shifted towards quantum control, particularly the creation and manipulation of topological phases of matter. Floquet engineering, the concept of tailoring a system by periodic fields, offers a powerful tool to manipulate electronic properties of condensed systems, and even to create exotic non-equilibrium topological states that are impossibly present in equilibrium scenarios. In this perspective, we give a brief review of recent progress in theoretical investigations of Floquet engineering topological states from effective models towards realistic materials. We show that light irradiation can realize various desired topological states through the introduction of symmetry breaking, such as first- and higher-order Weyl fermions, quadrupole topological insulator with periodic driving and disorder, quantum anomalous Hall effects with a tunable Chern number, as well as beyond. Moreover, based on first-principles calculations and Floquet theorem, we show several realistic material candidates proposed as potential hosts for promising Floquet topological states, facilitating their verification in experiments. We believe that our perspective on Floquet engineering of topological states will advance further studies of rich exotic light-induced phenomena in condensed matter physics.

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Imaging surfaces at the space–time limit: New perspectives of time-resolved scanning tunneling microscopy for ultrafast surface science

Müller

2024

Progress in Surface Science

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Floquet engineering of topological states in realistic quantum materials via light-matter interactions

Cited by 7 publications

References 210 publications

Ultrafast photoemission electron microscopy: A multidimensional probe of nonequilibrium physics

Ultrafast photoemission electron microscopy: A multidimensional probe of nonequilibrium physics

Perspective: Floquet engineering topological states from effective models towards realistic materials

Imaging surfaces at the space–time limit: New perspectives of time-resolved scanning tunneling microscopy for ultrafast surface science

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