Superballistic flow of viscous electron fluid induced by microwave irradiation in quantum point contact

We measure the resistance oscillation of quantum point contact (QPC) under microwave (MW) radiation. Apart from the well-known resistance oscillation induced by edge magnetoplasmon (EMP), we find out a novel resistance oscillation at lower magnetic field. This transport phenomenon is proved to be related to superballistic flow of electrons through QPC and its formation is due to abundant absorption of MW radiation. This resistance oscillation is explained through a picture of destruction of zero resistance state (ZRS) in QPC region, which might be in favor of domain picture of ZRS.