Erlangen 2018 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 42: Quantum Optics and Photonics II
Q 42.2: Vortrag
Mittwoch, 7. März 2018, 14:30–14:45, K 0.016
Driving Transitions between States in Topological Systems — •Christina Jörg1, Fabian Letscher1,2, Christoph Dauer1, Axel Pelster1, Sebastian Eggert1, Michael Fleischhauer1, and Georg von Freymann1,3 — 1Physics Department and Research Center OPTIMAS, TU Kaiserslautern, Germany — 2Graduate School Materials Science in Mainz, Kaiserslautern, Germany — 3Fraunhofer Institute for Industrial Mathematics ITWM, Kaiserslautern, Germany
On the one hand, edge states in topologically ordered systems have shown to be robust against many local perturbations [1-4]. On the other hand, it is known that periodic driving can induce transitions between different continuum states [5]. Here, we examine how to drive a transition between bulk states and an edge state in topologically nontrivial systems using a local AC-field. Our model system consists of evanescently coupled waveguides. They are positioned along x to form a Su-Schrieffer-Heeger (SSH) lattice with a defect that is periodically modulated in its position. We study how the time evolution of this system depends on the driving frequency and amplitude of the defect modulation. While for low frequencies the edge mode remains localized, we observe a strong coupling to bulk modes whenever the driving frequency is resonant with a bulk band in the SSH model.
[1] C. Jörg, et al., New J. Phys. 19, 083003 (2017).
[2] S. Mittal, et al., PRL 113, 087403 (2014).
[3] M. C. Rechtsman, et al., Nature 496, 196 (2013).
[4] Z. Wang, et al., Nature 461, 772 (2009).
[5] S. Reyes, et al., New J. Phys. 19, 043029 (2017).