Title: Gate-tunable Phase Transition in a Bosonic Su-Schrieffer-Heeger Chain
When: Wednesday, April 10, 2024, 12:00
Place: Department of Theoretical Condensed Matter Physics, Faculty of Sciences, Module 5, Seminar Room (5th Floor)
Speaker: Lukas Splithoff, QuTech, TU Delft, The Netherlands.
Metamaterials engineered to host topological states of matter in controllable quantum systems might hold promise for advancement of quantum simulations and quantum computing technologies. In this context, the Su-Schrieffer-Heeger (SSH) model has gained prominence due to its simplicity and practical applications, including entanglement stabilization in superconducting quantum circuits. Here, we present the implementation of a gate-tunable, five-unit-cell bosonic SSH chain on a one-dimensional lattice of superconducting resonators. We achieve electrostatic control over the inductive intra-cell coupling using semiconductor nanowire junctions, which enables the spectroscopic observation of a trivial-to-topological phase transition in the engineered topological metamaterial. Our approach offers precise and independent in-situ tuning of the coupling parameters – a feature that has eluded previous work. To this end, we will discuss the robustness of the topological edge state against various disorder realizations. Our results supplement efforts towards gate-controlled superconducting electronics and larger controllable bosonic lattices to enable quantum simulations.
