Houzet Manuel, Glazman Leonid I
Univ. Grenoble Alpes, CEA, IRIG-Pheliqs, F-38000 Grenoble, France.
Department of Physics, Yale University, New Haven, Connecticut 06520, USA.
Phys Rev Lett. 2019 Jun 14;122(23):237701. doi: 10.1103/PhysRevLett.122.237701.
A chain of small Josephson junctions (a.k.a. superinductor) emerged recently as a high-inductance, low-loss element of superconducting quantum devices. We notice that the intrinsic parameters of a typical superinductor in fact place it into the Bose glass universality class for which the propagation of waves in a sufficiently long chain is hindered by pinning. Its weakness provides for a broad crossover from the spectrum of well-resolved plasmon standing waves at high frequencies to the low-frequency excitation spectrum of a pinned charge density wave. We relate the scattering amplitude of microwave photons reflected off a superinductor to the dynamics of a Bose glass. The dynamics at long and short scales compared to the Larkin pinning length determines the low- and high-frequency asymptotes of the reflection amplitude.
最近，由一系列小约瑟夫森结（又称超电感）构成的元件作为超导量子器件中的一种高电感、低损耗元件出现。我们注意到，典型超电感的固有参数实际上将其置于玻色玻璃普适类中，对于该普适类，在足够长的链中波的传播会受到钉扎的阻碍。其弱点导致从高频下分辨良好的等离子体驻波频谱到钉扎电荷密度波的低频激发频谱出现广泛的交叉。我们将从超电感反射的微波光子的散射幅度与玻色玻璃的动力学联系起来。与拉金钉扎长度相比，长尺度和短尺度下的动力学决定了反射幅度的低频和高频渐近线。
