FisMat2017 - Submission - View

Abstract's title: Tiime-resolved dynamical Franz-Keldish effect in Diamond
Submitting author: Matteo Lucchini
Affiliation: Politecnico di Milano Dipartimento di Fisica
Affiliation Address: Peazza Leonardo da Vinci 32, 20133 Milano
Country: Italy
Oral presentation/Poster (Author's request): Oral presentation
Other authors and affiliations: Shun-Suke. A. Sato2, Jens Herrmann1, André Ludwig1, Michal Volkov1, Lamia Kasmi1, Yasushi Shinohara3, Kazuhiro Yabana2, Lukas Gallmann1,4 and Ursula Keller1 1. Department of Physics, ETH Zurich, 8093 Zürich, Switzerland 2. Center for Computational Sciences, University of Tsukuba, 305-8577 Tsukuba, Japan 3. Photon Science Center, the University of Tokyo, 113-8656 Tokyo, Japan 4. Institute of Applied Physics, University of Bern, 3012 Bern, Switzerland

The possibility to manipulate the electrical properties of matter with very short optical pulses is a fascinating field of research with possible far-reaching applications in many relevant technological fields1. The first step towards the realization of this goal is to understand the ultrafast dynamics at the basis of light-matter interaction. Short and intense pulses allowed us to investigate a very interesting regime where the photon energy becomes comparable to the cycle-averaged kinetic energy of the electrons in the field. As the optical response of the material transitions from a classical to a quantum-mechanical description many intriguing effects co-exist and the importance of inter- versus intra-band transitions is debated. We used attosecond transient absorption spectroscopy in polycrystalline diamond to study its response in this regime. THe experimental results revealed close-to-petahertz electron dynamics high into the conduction band. Comparison with time-dependent density functional theory calculations and a simpler two band numerical model allowed to identifiey the dynamical Franz-Keldysh effect as the main physical mechanism underlying the observed response. Therefore our results and analysis constitutes an important step towards a full understanding of the response of dielectrics to Petahertz fields.