Department of Microtechnology and Nanoscience, MC2, Chalmers University of Technology, SE-41296 Gothenburg, Sweden.
Phys Rev Lett. 2010 Sep 17;105(12):127001. doi: 10.1103/PhysRevLett.105.127001. Epub 2010 Sep 16.
We develop a theoretical description of nonadiabatic Josephson dynamics in superconducting junctions containing low energy quasiparticles. Within this approach we investigate the effects of midgap states in junctions of unconventional d-wave superconductors. We identify a reentrance effect in the transition between thermal activation and macroscopic quantum tunneling, and connect this phenomenon to the experimental observations in Phys. Rev. Lett. 94, 087003 (2005). It is also shown that nonlinear Josephson dynamics can be defined by resonant interaction with midgap states reminiscent of nonlinear optical phenomena in media of two-level atoms.
我们发展了一种包含低能准粒子的超导结中非绝热约瑟夫森动力学的理论描述。在这种方法中，我们研究了非常规 d 波超导体结中能隙中间态的影响。我们在热激活和宏观量子隧穿之间的转变中发现了再进入效应，并将这一现象与 Phys. Rev. Lett. 94, 087003 (2005) 中的实验观测联系起来。我们还表明，通过与类似于两能级原子介质中的非线性光学现象的能隙中间态的共振相互作用，可以定义非线性约瑟夫森动力学。
