Berlin 2024 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 74: Topological Insulators
TT 74.10: Talk
Thursday, March 21, 2024, 17:30–17:45, H 3005
A gate-tunable bosonic Su-Schrieffer-Heeger chain — •Lukas Johannes Splitthoff1,2, Miguel Carrera Belo1,2, Guliuxin Jin2, Eliska Greplova2, and Christian Kraglund Andersen1,2 — 1QuTech, Delft University of Technology, Delft 2628 CJ, The Netherlands — 2Kavli Institute for Nanoscience, Delft University of Technology, Delft 2628 CJ, The Netherlands
Metamaterials engineered to host topological states of matter in controllable quantum systems hold promise for quantum simulations and the advancement of quantum computing technologies. In this context, the Su-Schrieffer-Heeger (SSH) chain, a textbook example of topological matter, has gained prominence due to its simplicity and practical applications, including entanglement stabilization in superconducting quantum circuits. In this talk, we present the implementation of a five-unit-cell bosonic SSH chain on a one-dimensional lattice of superconducting resonators. Our approach offers precise and independent in-situ tuning of coupling parameters a feature that has eluded previous work. We achieve electrostatic control over the inductive intercell coupling using semiconductor nanowire junctions, which enables the spectroscopic observation of a trivial-to-topological phase transition in the engineered topological metamaterial. In particular, we will discuss the robustness of the topological edge state against various disorder realizations, including local perturbations and noise originating from electrostatic gate control. Our results pave the way for larger controllable bosonic lattices to facilitate quantum simulations.
Keywords: Metamaterials; Su-Schrieffer-Heeger model; semiconductor nanowire junction; gate tunability