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
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
| | | Lehrstuhl für Laserphysik |
|
| | | Lehrstuhl für Laserphysik |
|
| Hommelhoff, Peter Prof. Dr. |
| | Lehrstuhl für Laserphysik |
|
| | | 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). |