posted on 2024-02-23, 17:18authored byKrishnendu Maji, Joydip Sarkar, Supriya Mandal, Sriram H., Mahesh Hingankar, Ayshi Mukherjee, Soumyajit Samal, Anirban Bhattacharjee, Meghan P. Patankar, Kenji Watanabe, Takashi Taniguchi, Mandar M. Deshmukh
The superconducting coplanar waveguide (SCPW) cavity
plays an essential
role in various areas like superconducting qubits, parametric amplifiers,
radiation detectors, and studying magnon-photon and photon-phonon
coupling. Despite its wide-ranging applications, the use of SCPW cavities
to study various van der Waals 2D materials has been relatively unexplored.
The resonant modes of the SCPW cavity exquisitely sense the dielectric
environment. In this work, we measure the charge compressibility of
bilayer graphene coupled to a half-wavelength SCPW cavity. Our approach
provides a means to detect subtle changes in the capacitance of the
bilayer graphene heterostructure, which depends on the compressibility
of bilayer graphene, manifesting as shifts in the resonant frequency
of the cavity. This method holds promise for exploring a wide class
of van der Waals 2D materials, including transition metal dichalcogenides
(TMDs) and their moiré, where DC transport measurement is challenging.