Universality of the Spectra of Multiterminal Josephson Junction

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Abstract

Andreev bound states are formed in multiterminal structures based on normal metals and superconductors. Their spectrum is determined by the system parameters, in particular the scattering phases and transmission coefficients at the nodes. The article found conditions under which Andreev bound states are universal: they don’t change with any change in the reflection phases. As a consequence, the spectrum is completely determined by the transport characteristics of the system. The result was obtained for a structure in the form of a normal metal M-finite star, each of the rays (terminals) Nk of which is in contact with its superconductor Sk, 1 ≤ k ≤ M. Together they form a multiterminal Josephson junction. At the center of the structure there is a non-magnetic impurity with its some scattering matrix.

About the authors

A. F. Posadsky

P.N. Lebedev Physical Institute of the Russian Academy of Sciences; Moscow Institute of Physics and Technology (National Research University)

Author for correspondence.
Email: posadskij.af@phystech.edu
Russian Federation, Moscow; Dolgoprudny

A. G. Semenov

P.N. Lebedev Physical Institute of the Russian Academy of Sciences; Skolkovo Institute of Science and Technology

Email: semenov@lpi.ru
Russian Federation, Moscow; Moscow

P. I. Arseev

P.N. Lebedev Physical Institute of the Russian Academy of Sciences

Email: ars@lpi.ru

Corresponding Member of the RAS

Russian Federation, Moscow

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