Department of Physics, NTNU, Norwegian University of Science and Technology, N-7491 Trondheim, Norway.
Sci Rep. 2016 Dec 16;6:38739. doi: 10.1038/srep38739.
We demonstrate theoretically that microwave radiation applied to superconducting proximity structures controls the minigap and other spectral features in the density of states of normal and magnetic metals, respectively. Considering both a bilayer and Josephson junction geometry, we show that microwaves with frequency ω qualitatively alters the spectral properties of the system: inducing a series of resonances, controlling the minigap size E, and even replacing the minigap with a strong peak of quasiparticle accumulation at zero energy when ω = E. The interaction between light and Cooper pairs may thus open a route to active control of quantum coherent phenomena in superconducting proximity structures.
我们从理论上证明，应用于超导近邻结构的微波辐射分别控制了正常和磁性金属的态密度中的能隙和其他谱特征。考虑到双层和约瑟夫森结几何结构，我们表明，频率为ω的微波从定性上改变了系统的光谱性质：诱导一系列共振，控制能隙大小 E，甚至当 ω=E 时，用零能处的准粒子积累的强峰取代能隙。因此，光与库珀对之间的相互作用可能为超导近邻结构中的量子相干现象的主动控制开辟了一条途径。
