"Listening to the music of superfluid"
Twenty years following the groundbreaking discovery of graphene, the realm of two-dimensional materials continues to amaze us with captivating physics. Utilizing the giant thermal response of the pseudo-relativistic electrons in graphene, we recently demonstrated the calorimetric single-photon detection by sensing the heat from the internal energy of an individual infrared photon. Another exciting avenue of exploration lies in understanding how the strongly interacting electrons and topological states give rise to superconductivity. However, measuring the superfluid density of these two-dimensional superconductors is challenging because their thickness are only a few atomic layers, rendering traditional methods inadequate for this frontier of inquiry. In this presentation, I will showcase how to measure the kinetic inductance of superconductors by listening to the sound of superfluid, thereby elucidating the superfluid stiffness of Weyl and moiré superconductors. Our findings suggest that they exhibit nodal superconductivity, characterized by the nonlinear Meissner effect.
