Ab-intio study of ultrafast charge dynamics in graphene
arXiv:2012.00435 · doi:10.1103/PhysRevB.103.L081102
Abstract
Monolayer graphene provides an ideal material to explore one of the fundamental light-field driven interference effects: Landau-Zener-Stückelberg interference. However, direct observation of the resulting interference patterns in momentum space has not proven possible, with Landau-Zener-Stückelberg interference observed only indirectly through optically induced residual currents. Here we show that the transient electron momentum density (EMD), an object that can easily be obtained in experiment, provides an excellent description of momentum resolved charge excitation. We employ state-of-the-art time-dependent density function theory calculations, demonstrating by direct comparison of EMD with conduction band occupancy, obtained from projecting the time propagated wavefunction onto the ground state, that the two quantities are in excellent agreement. For even the most intense laser pulses we find that the electron dynamics to be almost completely dominated by the -band, with transitions to other bands strongly suppressed. Simple model based tight-binding approaches can thus be expected to provide an excellent description for the laser induced electron dynamics in graphene.
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Cited by in corpus (9)
- Nonadiabatic Landau-Zener-Stückelberg-Majorana transitions, dynamics, and interference
- Electronic coherence and coherent dephasing in the optical control of electrons in graphene
- Adiabaticity parameters for the categorization of light-matter interaction -- from weak to strong driving
- Intense-pulse dynamics of massless Dirac electrons
- Photocurrent generation in solids via linearly polarized laser
- Strong-Field Bloch Electron Interferometry for Band Structure Retrieval
- Atomic real-space perspective of light-field-driven currents in graphene
- High-purity valley-polarized currents induced by bichromatic optical fields in two-dimensional materials
- Ultrafast Saddletronics