BPCPPDYSOE21 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 24: Dynamics and Statistical Physics - Open Session
DY 24.2: Vortrag
Dienstag, 23. März 2021, 11:20–11:40, DYb
Dissipative nonequilibrium synchronization of topological edge states via self-oscillation — •Christopher W. Wächtler1,2,3, Victor M. Bastidas3, Gernot Schaller1, and William J. Munro3,4 — 1Institut für Theoretische Physik, Berlin, Germany — 2Max-Planck Institut für Physik komplexer Systeme, Dresden, Germany — 3NTT Basic Research Laboratories, Atsugi, Japan — 4National Institute of Informatics, Tokyo, Japan
The interplay of synchronization and topological band structures with symmetry protected midgap states under the influence of driving and dissipation is largely unexplored. Here we consider a trimer chain of electron shuttles, each consisting of a harmonic oscillator coupled to a quantum dot positioned between two electronic leads. Each shuttle is subject to thermal dissipation and undergoes a bifurcation towards self-oscillation with a stable limit cycle if driven by a bias voltage between the leads [1]. By mechanically coupling the oscillators together, we observe synchronized motion at the ends of the chain, which can be explained using a linear stability analysis. Because of the inversion symmetry of the trimer chain, these synchronized states are topologically protected against local disorder [2]. Furthermore, with current experimental feasibility, the synchronized motion can be observed by measuring the dot occupation of each shuttle. Our results open another avenue to enhance the robustness of synchronized motion by exploiting topology.
[1] C. W. Wächtler et al., NJP 21, 073009 (2019).
[2] C. W. Wächtler et al, PRB 102, 014309 (2020).