Light-field driven currents in graphene

Beitrag in einer Fachzeitschrift
(Letter)


Details zur Publikation

Autor(en): Higuchi T, Heide C, Ullmann K, Weber HB, Hommelhoff P
Zeitschrift: arXiv
Jahr der Veröffentlichung: 2016
Band: 12
ISSN: 2331-8442
Sprache: Englisch


Abstract


Ultrafast electron dynamics in solids under strong optical fields has recently found particular attention. In dielectrics and semiconductors, various light-field-driven effects have been explored, such as high-harmonic generation, sub-optical-cycle interband population transfer and nonperturbative increase of transient polarizability. In contrast, much less is known about field-driven electron dynamics in metals because charge carriers screen an external electric field in ordinary metals. Here we show that atomically thin monolayer Graphene offers unique opportunities to study light-field-driven processes in a metal. With a comparably modest field strength of up to 0.3 V/{\AA}, we drive combined interband and intraband electron dynamics, leading to a light-field-waveform controlled residual conduction current after the laser pulse is gone. We identify the underlying pivotal physical mechanism as electron quantum-path interference taking place on the 1-femtosecond (10-15s)timescale. The process can be categorized as Landau-Zener-St\"uckelberg interferometry. These fully coherent electron dynamics in graphene take place on a hitherto unexplored timescale faster than electron-electron scattering (tens of femtoseconds) and electron-phonon scattering (hundreds of femtoseconds). These results broaden the scope of light-field control of electrons in solids to an entirely new and eminently important material class -- metals -- promising wide ramifications for band structure tomography and light-field-driven electronics.



FAU-Autoren / FAU-Herausgeber

Heide, Christian
Lehrstuhl für Laserphysik
Higuchi, Takuya Dr.
Lehrstuhl für Laserphysik
Hommelhoff, Peter Prof. Dr.
Lehrstuhl für Laserphysik
Ullmann, Konrad
Lehrstuhl für Angewandte Physik
Weber, Heiko B. Prof. Dr.
Lehrstuhl für Angewandte Physik


Zusätzliche Organisationseinheit(en)
Sonderforschungsbereich 953/2 Synthetische Kohlenstoffallotrope


Zitierweisen

APA:
Higuchi, T., Heide, C., Ullmann, K., Weber, H.B., & Hommelhoff, P. (2016). Light-field driven currents in graphene. arXiv, 12.

MLA:
Higuchi, Takuya, et al. "Light-field driven currents in graphene." arXiv 12 (2016).

BibTeX: 

Zuletzt aktualisiert 2018-07-08 um 23:16