Science Daily March 30, 2022
In previous experiments, the light intensity for realizing Floquet state (where the original quantum state is replicated when light is irradiated on matters) in solids was enormous due to the high frequency of light. An international team of researchers (South Korea, Japan)
succeeded in the experimental realization of the steady Floquet state in a graphene Josephson junction (GJJ) by irradiating continuous microwaves on it. The intensity of the light was decreased to one trillionth the value of previous experiments, significantly reducing the heat generation and enabling continuously long-lasting Floquet states. They also developed a novel superconducting tunneling spectroscopy to measure the Floquet states with high energy resolution to quantitatively verify the characteristics of the Floquet state that varies depending on the intensity, frequency and polarization of light applied to the device. The study provides a basis for understanding and engineering non-equilibrium quantum states in nanodevices…read more. TECHNICAL ARTICLEÂ
Schematics of Andreev bound state and device geometry. Credit: Nature volume 603, pages421–426 (2022)Â