The cavity electromechanical system by using a semiconducting nanowire and its microwave bolometry application

The cavity-electromechanical systems typically comprise a superconducting microwave cavity and a mechanical resonator. The superconducting microwave cavity carries the microwave (photon) which interacts with the mechanical motion (phonon). In recent years, this system provides great opportunities to investigate the quantum mechanical system due to the achievement of ground state phonon. To realize this system, the most of previous researches have utilized a superconducting microwave cavity which capacitively coupled to a superconducting mechanical resonator. In this case, the motion of the metallic mechanical resonator only changes the frequency of the microwave photon cavity, which is called dispersive coupling. We utilize a resistive semiconductor nanowire as a mechanical resonator embedded in a superconducting microwave cavity. The field effect of the semiconductor nanowire provides a gate dependence of resistance in the total microwave circuit, expecting the motion of the nanowire changes the dissipation rate of the total circuit (dissipative coupling). We verify the existence of both dispersive and dissipative couplings by comparing the measured sideband power with the circuit model analysis. As an application, this microwave loss of the semiconducting nanowire utilizes the microwave bolometry at milli-kelvin temperatures.