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Promotionsvortrag Physik: Topologically Protected Transport of Phonons at the Nanoscale

Jul 03
3. July 2019 16:00 - 17:00
Raum A. 2.500 (Bibliothek), Max-Planck-Institut für die Physik des Lichts, Staudtstraße 2, Erlangen

Einladung zum Promotionsvortrag von Herrn Christian Brendel:
„Topologically Protected Transport of Phonons at the Nanoscale“

Unlike electrons, phonons do not feel a magnetic field, because they are not charged. Thus, much of the physics connected with charged particles in magnetic fields is absent for phonons, be it the Lorentz force or the unidirectional transport along the sample edges. Moreover, phonons are bosonic particles and thus do not have a spin such that the realization of Chern-insulator-like schemes is challenging.
Recently, researchers have started to study how one might make phonons akin to electrons in a magnetic field or related topological settings. The first experimental implementations involving coupled pendula or gyroscopes or air currents have already been realized at the macroscopic scale.
In the thesis “Topologically Protected Transport of Phonons at the Nanoscale”, we describe designs that are well-suited for the nanoscale. The proposed setups include a phononic Chern insulator, the generation of a pseudo magnetic field for phonones and a topological insulator setup for mechanical waves. All approaches are based on an already experimentally demonstrated platform, a simple patterned 2D material. Here, we re-engineer the fundamental mechanisms that lead to robust electron transport, apply them to phononic setups and discuss their feasibility in an experiment. (Vortrag auf Englisch)

Dem Vortrag schließt sich eine Diskussion von 15 Minuten an. Vortrag und Diskussion sind öffentlich. Diesen Verfahrensteilen folgt ein nicht öffentliches Rigorosum von 45 Minuten.