Detecting light-induced Floquet band gaps of graphene via trARPES
arXiv:2108.05351 · doi:10.1103/PhysRevResearch.4.013057
Abstract
We propose a realistic regime to detect the light-induced topological band gap in graphene via time-resolved angle-resolved photoelectron spectroscopy (trARPES), that can be achieved with current technology. The direct observation of Floquet-Bloch bands in graphene is limited by low-mobility, Fourier-broadening, laser-assisted photoemission (LAPE), probe-pulse energy-resolution bounds, space-charge effects and more. We characterize a regime of low driving frequency and high amplitude of the circularly polarized light that induces an effective band gap at the Dirac point that exceeds the Floquet zone. This circumvents limitations due to energy resolutions and band broadening. The electron distribution across the Floquet replica in this limit allow for distinguishing LAPE replica from Floquet replica. We derive our results from a dissipative master equation approach that gives access to two-point correlation functions and the electron distribution relevant for trARPES measurements.
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- Observation of Floquet states in graphene
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- Observation of Floquet-induced gap in graphene
- TR-ARPES Signal in Pumped Semiconductors within Dynamical Projective Operatorial Approach (DPOA)
- Stability of Floquet sidebands and quantum coherence in 1D strongly interacting spinless fermions
- Magneto-optical Kerr effect in pump-probe setups
- Non-linear photoconductivity of strongly driven graphene
- Frequency dependence of the light-induced Hall effect in dissipative graphene
- Robustness of the Floquet-assisted superradiant phase and possible laser operation
- Time- and angle-resolved photoelectron spectroscopy of strong-field light-dressed solids: prevalence of the adiabatic band picture
- Study on axial fields in the dynamically assisted Schwinger effect