Dresden 2020 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 15: Graphene (jointly with DY, MA, HL, DS, O) (joint session TT/DY/HL)

HL 15.13: Vortrag

Montag, 16. März 2020, 18:15–18:30, HSZ 201

Lightwave valleytronics in graphene — •Hamed Koochaki Kelardeh¹, Alexandra Landsman², and Takashi Oka¹ — ¹Max Planck Institute for the Physics of Complex Systems, Dresden, Germany — ²Ohio State University, Columbus, USA

We propose a valley-selective device based on graphene at a few-femtosecond timescale with charge separation at different sublattices, and correspondingly at nonequivalent valleys. We characterize the maximality condition of valley polarization and investigate the parameters and condition upon which we can coherently control the carriers and store data via valley degree of freedom. The valley polarization is controlled by the amplitude as well as the carrier-envelope phase of the pulse - one cycle optical field - and the curvature of the electron trajectory in the reciprocal space. We believe the results of our study will step forward the Valleytronics and shed light on ultrafast data storage and processing with uttermost reliability and robustness.