Coherent Dynamics of Floquet-Bloch States in Monolayer WS2 Reveals Fast Adiabatic Switching
arXiv:2106.10618 · doi:10.1103/PhysRevB.104.L060303
Abstract
Floquet engineering offers a path to optically-controlled materials, but experimental implementations have frequently relied on femtosecond pulses to achieve the high peak fields required to maximise interactions and obtain a measurable response. The Floquet formalism, however, is based on a continuous, periodic drive. Here we use femtosecond laser pulses to drive the optical Stark effect, a simple realization of Floquet engineering, in monolayer WS2. By monitoring the coherent evolution of the free-induction decay, we show that the system evolves adiabatically, and that the finite duration of the pulses does not introduce any effects beyond Floquet theory. Furthermore, we demonstrate that the induced energy shift follows a linear dependence on instantaneous intensity, even for ultrafast driving fields of fewer than 15 optical cycles.
References in corpus (10)
- Photovoltaic Hall effect in graphene
- Measurement of the optical dielectric function of transition metal dichalcogenide monolayers: MoS2, MoSe2, WS2 and WSe2
- Measuring the Chern number of Hofstadter bands with ultracold bosonic atoms
- Ultrafast Generation of Pseudo-magnetic Field for Valley Excitons in WSe2 Monolayers
- Photoinduced transition between conventional and topological insulators in two-dimensional electronic systems
- Ultrafast Manipulation of Valley Pseudospin
- Microscopic theory for the light-induced anomalous Hall effect in graphene
- Monitoring in real time the photon-dressing and undressing of quasiparticles from first principles time-resolved photoelectron spectroscopy
- Motional narrowing, ballistic transport, and trapping of room-temperature exciton polaritons in an atomically-thin semiconductor
- Quantum interference between the optical Stark effect and resonant harmonic generation in WS2
Cited by in corpus (10)
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- Controlling Floquet states on ultrashort time scales
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- Floquet theory and computational method for the optical absorption of laser-dressed solids
- Effects of Floquet Engineering on the Coherent Exciton Dynamics in Monolayer WS
- Optical Conductivity Signatures of Floquet Electronic Phases
- First-principle based Floquet engineering of solids in the velocity gauge
- Insights from the exact analytical solution of periodically driven transverse field Ising chain
- Robust purely optical signatures of Floquet states in laser-dressed crystals
- Floquet engineering in the presence of optically excited carriers