Coherent electron trajectory control in graphene

Abstract

We investigate coherent electron dynamics in graphene, interacting with the electric field waveform of two orthogonally polarized, few-cycle laser pulses. Recently, we demonstrated that linearly polarized driving pulses lead to sub-optical-cycle Landau-Zener quantum path interference by virtue of the combination of intraband motion and interband transition [Higuchi $\text{et al.}$, Nature $\text{550}$, 224 (2017)]. Here we introduce a pulsed control laser beam, orthogonally polarized to the driving pulses, and observe the ensuing electron dynamics. The relative delay between the two pulses is a tuning parameter to control the electron trajectory, now in a complex fashion exploring the full two-dimensional reciprocal space in graphene. Depending on the relative phase, the electron trajectory in the reciprocal space can, for example, be deformed to suppress the quantum path interference resulting from the driving laser pulse. Intriguingly, this strong-field-based complex matter wave manipulation in a two-dimensional conductor is driven by a high repetition rate \textit{laser oscillator}, rendering unnecessary complex and expensive amplified laser systems.

References in corpus (9)

• The electronic properties of graphene
• Sub-cycle control of terahertz high-harmonic generation by dynamical Bloch oscillations
• Landau-Zener-Stuckelberg interferometry
• Real-time observation of interfering crystal electrons in high-harmonic generation
• Snapshots of non-equilibrium Dirac carrier distributions in graphene
• Light-field driven currents in graphene
• Impact of the electronic band structure in high-harmonic generation spectra of solids
• Ellipticity dependence of high-harmonic generation in solids: unraveling the interplay between intraband and interband dynamics
• Minimum requirements for laser-induced symmetry breaking in quantum and classical mechanics

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