Fishbone resonance structure in the attosecond transient absorption spectrum of graphene

We present a numerical experiment that demonstrates the possibility to capture topological phase transitions via an x-ray absorption spectroscopy scheme. We consider a Chern insulator whose topological phase is tuned via a second-order hopping. We perform time-dynamics simulations of the out-of-equilibrium laser-driven electron motion that enables us to model a realistic attosecond spectroscopy scheme. In particular, we use an ultrafast scheme with a circularly polarized IR pump pulse and an attosecond x-ray probe pulse. A laser-induced dichroism-type spectrum shows a clear signature of the topological phase transition. We are able to connect these signatures with the Berry structure of the system. This work extend the applications of attosecond absorption spectroscopy to systems presenting a non-trivial topological phase.

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Simulating strong-field electron-hole dynamics in solids probed by attosecond transient absorption spectroscopy

Cavaletto,

Madsen

2024

Phys. Rev. A

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Fishbone resonance structure in the attosecond transient absorption spectrum of graphene

Cited by 10 publications

References 45 publications

Pseudospins revealed through the giant dynamical Franz-Keldysh effect in massless Dirac materials

Pseudospins revealed through the giant dynamical Franz-Keldysh effect in massless Dirac materials

Topological phase transitions via attosecond x-ray absorption spectroscopy

Simulating strong-field electron-hole dynamics in solids probed by attosecond transient absorption spectroscopy

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