Our manuscript presenting a hybrid circuit with a BSCCO flake is out! You can view the arXiv pre-print here.
This work was led by Haolin Jin, Giuseppe Serpico, and Yejin Lee, and is part of a long-term collaboration we have with the Superpuddles group led by Nicola Poccia at the IFW Dresden.
We present the first hybrid device of a microwave superconducting resonator incorporating a van der Waals cuprate flake. The resonant mode remains highly coherent even when the flake participates strongly in it – making the circuit a sensitive probe of the BSCCO superconducting structure. Thermal measurements of the resonance frequency reveal a significant upshift due to the presence of the flake, with minimal reduction of quality. We can model the upshift by an interaction with a low-frequency collection of excitations within the flake, but the microscopic origin of this new mode is not yet known. Furthermore, we observe a significant positive nonlinearity in the hybrid device, as opposed to conventional negative signals in typical superconducting circuits. Thus, the hybrid circuit could be a new source of non-dissipative nonlinearity, unrelated to the Josephson effect!
This measurement hints at new physics in the cuprate flake and its microwave environment, and also showcases the hybrid superconducting resonator both as a robust probe of unconventional superconductivity in various materials and as a platform for new devices for quantum technology. Additionally, this manuscript is a milestone for QIQM as the first experimental work where all device fabrication and measurement was done in-house.
Congratulations and big thanks to everyone who participated!
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