The advent of two-dimensional van der Waals materials is a frontier of condensed matter physics and quantum devices. However, characterizing such materials remains challenging due to the limitations of bulk material techniques, necessitating the development of specialized methods. In this study, we investigate the superconducting properties of Bi2Sr2CaCu2O8+x flakes by integrating them with a hybrid superconducting microwave resonator. The hybrid resonator is significantly modified by the interaction with the flake while maintaining a high quality factor. We also observe a significant upshift of the resonator frequency with increasing temperature, as well as a positive nonlinearity. These effects originate from a presently unknown microscopic mechanism within the flake, and can be modeled as a two-level system bath interacting with the resonant mode. Our findings open a path for high quality hybrid circuits with van der Waals flakes for exploring novel materials and developing new devices for quantum technology.
@article{arxiv.2408.12383,
title = {Exploring van der Waals cuprate superconductors using a hybrid microwave circuit},
author = {Haolin Jin and Giuseppe Serpico and Yejin Lee and Tommaso Confalone and Christian N. Saggau and Flavia Lo Sardo and Genda Gu and Berit H. Goodge and Edouard Lesne and Domenico Montemurro and Kornelius Nielsch and Nicola Poccia and Uri Vool},
journal= {arXiv preprint arXiv:2408.12383},
year = {2025}
}
Comments
5 pages, 4 figures with a supplementary material of 10 pages and 9 figures