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Ultrafast terahertz response of multilayer graphene in the nonperturbative regime

P. Bowlan, E. Martinez-Moreno, K. Reimann, T. Elsaesser, and M. Woerner
Phys. Rev. B 89, 041408(R) – Published 27 January 2014

Abstract

The nonlinear dynamics of electrons in multilayer epitaxial graphene is investigated by time-resolved terahertz (THz) spectroscopy in a regime where the interaction of electrons with the external field dominates over scattering processes. The predominantly coherent electron response to the THz field involves both intra- and interband currents, leading to coherently driven interband transitions of carriers and to the generation of higher harmonics of the THz carrier frequency. The overall behavior of the graphene layers is always absorptive, even after generation of an initial electron-hole distribution by femtosecond midinfrared excitation. The results are in agreement with theoretical calculations of the nonperturbative THz response.

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  • Received 18 June 2013

DOI:https://doi.org/10.1103/PhysRevB.89.041408

©2014 American Physical Society

Authors & Affiliations

P. Bowlan, E. Martinez-Moreno, K. Reimann, T. Elsaesser, and M. Woerner

  • Max-Born-Institut für Nichtlineare Optik und Kurzzeitspektroskopie, 12489 Berlin, Germany

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Issue

Vol. 89, Iss. 4 — 15 January 2014

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