Berlin 2015 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 20: Poster IA (Ultrafast phenomena; Optical properties; Transport; Theory)

HL 20.2: Poster

Monday, March 16, 2015, 15:00–20:00, Poster B

Electron dynamics driven by light carrying orbital angular momentum — •Jonas Wätzel and Jamal Berakdar — Institut für Physik, Martin-Luther Universität Halle-Wittenberg, Karl-Freiherr-von-Fritsch-Str. 3, 06120 Halle

The feasibility of light carrying orbital angular momentum (OAM) opened new opportunities in photonics [1] but also in optoelectronics. When interacting with matter, OAM beams may transfer a torque to the carrier with an amount governed by the topological charge l. This allows to steer the orbital [2] as well as the spin dynamics [3]. Indeed, an OAM beam irradiating an injected electronic wave packet in a 2D semiconductor stripe results in an edge charge-density accumulation that can be steered by the OAM beam [2].

Here, we present results for an isolated mesoscopic 2D ring driven by OAM laser. The calculations reveal that due to the transferred torque a directed current can be generated and controlled by the sign and the strength of the topological charge l. We also discuss technological applications of these phenomena.

[1] L. Allen, S. M. Barnett, and M. Padgett, Optical Angular Momentum (Institute of Physics Publishing, Bristol, 2003).

[2] J. Wätzel, A. S. Moskalenko and J. Berakdar, Opt. Express 20, 27992 (2012)

[3] G. F. Quinteiro and J. Berakdar, Opt. Express 17, 20465 (2009)