Quasiparticle interferometer controlled by quantum-correlated Andreev reflection
Hayato Nakano, Hideaki Takayanagi
DOI 10.1103/PhysRevB.47.7986 · Physical Review B
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Abstract
We propose a quasiparticle interferometer and give a theoretical analysis for it. It consists of a Josephson junction (JJ) and a Y junction composed of normal-electron waveguides. The interferometer should enable us to confirm experimentally the phase interaction between a quasiparticle and a superconducting state at the superconductor–normal-metal (SN) interface. This interaction is caused by Andreev reflection. The supercurrent through the JJ modifies, by Andreev reflection, the interference of a quasiparticle in the waveguide and affects the normal resistance of the waveguide. The dependence of the resistance on the phase difference of JJ is determined by the characteristics of the Y junction and the normal reflection at the SN interface.
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