Regensburg 2019 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 5: Topological insulators
HL 5.8: Vortrag
Montag, 1. April 2019, 11:15–11:30, H36
Haldane circuit — •Tobias Helbig1, Tobias Hofmann1, Ching Hua Lee2,3, Martin Greiter1, and Ronny Thomale1 — 1Institute for Theoretical Physics and Astrophysics, University of Würzburg, Am Hubland, 97074 Würzburg, Germany — 2Institute of High Performance Computing, A*STAR, Singapore, 138632 — 3Department of Physics, National University of Singapore, Singapore, 117542
We propose an implementation of the Chern state in a topolectrical circuit network, featuring topologically protected, unidirectional propagation of voltage packages at its boundary. Recently, electrical circuit arrays have been established as an easily accessible and tunable environment to host synthetic topological states of matter. The breaking of reciprocity and time-reversal symmetry as well as minimizing dissipation effects constitute the central challenges arising in a circuit realization of the Chern state. In this talk, we present operational amplifiers in a negative-impedance converter configuration as the key component to master these challenges. We report on our results of a dissipation-corrected circuit implementation of the Haldane model.