Phys. Rev. Lett. 92, 017004 (2004) [4 pages]Superconductor-Proximity Effect in Hybrid Structures: Fractality versus ChaosReceived 26 August 2003; published 9 January 2004 We study the proximity effect of a superconductor to a normal system with a fractal spectrum. We find that there is no gap in the excitation spectrum, even in the case where the underlying classical dynamics of the normal system is chaotic. An analytical expression for the distribution of the smallest excitation eigenvalue E1 of the hybrid structure is obtained. On small scales it decays algebraically as P(E1)∼E1-D0, where D0 is the fractal dimension of the spectrum of the normal system. Our theoretical predictions are verified by numerical calculations performed for various models. © 2004 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.92.017004
DOI:
10.1103/PhysRevLett.92.017004
PACS:
74.45.+c, 05.45.Mt, 73.23.–b
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