Cha Jinwoong, Kim Hakseong, Kim Jihwan, Shim Seung-Bo, Suh Junho
Quantum Technology Institute, Korea Research Institute of Standards and Science, 34113 Daejeon, South Korea.
Department of Physics, Korea Advanced Institute of Science and Technology, 34141 Daejeon, South Korea.
Nano Lett. 2021 Feb 24;21(4):1800-1806. doi: 10.1021/acs.nanolett.0c04845. Epub 2021 Feb 8.
Nanoscale electromechanical coupling provides a unique route toward control of mechanical motions and microwave fields in superconducting cavity electromechanical devices. However, conventional devices composed of aluminum have presented severe constraints on their operating conditions due to the low superconducting critical temperature (1.2 K) and magnetic field (0.01 T) of aluminum. To enhance their potential in device applications, we fabricate a superconducting electromechanical device employing niobium and demonstrate a set of cavity electromechanical dynamics, including back-action cooling and amplification, and electromechanically induced reflection at 4.2 K and in strong magnetic fields up to 0.8 T. Niobium-based electromechanical transducers operating at this temperature could potentially be employed to realize compact, nonreciprocal microwave devices in place of conventional isolators and cryogenic amplifiers. Moreover, with their resilience to magnetic fields, niobium devices utilizing the electromechanical back-action effects could be used to study spin-phonon interactions for nanomechanical spin-sensing.
纳米级机电耦合为控制超导腔机电装置中的机械运动和微波场提供了一条独特途径。然而，由于铝的超导临界温度较低（1.2 K）和磁场较低（0.01 T），由铝制成的传统装置在其工作条件方面存在严重限制。为了提高它们在器件应用中的潜力，我们制造了一种采用铌的超导机电装置，并展示了一系列腔机电动力学特性，包括背向作用冷却和放大，以及在4.2 K和高达0.8 T的强磁场中的机电诱导反射。在此温度下工作的基于铌的机电换能器有可能用于实现紧凑的、非互易的微波器件，以取代传统的隔离器和低温放大器。此外，由于其对磁场的耐受性，利用机电背向作用效应的铌器件可用于研究用于纳米机械自旋传感的自旋 - 声子相互作用。
