Andreev-Bragg reflection from an Amperian superconductor

Abstract

We show how an electrical measurement can detect the pairing of electrons on the same side of the Fermi surface (Amperian pairing), recently proposed by Patrick Lee for the pseudogap phase of high-$T_c$ cuprate superconductors. Bragg scattering from the pair-density wave introduces odd multiples of $2k_{\mathrm{F}}$ momentum shifts when an electron incident from a normal metal is Andreev-reflected as a hole. These Andreev-Bragg reflections can be detected in a three-terminal device, containing a ballistic Y-junction between normal leads $(1,2)$ and the superconductor. The cross-conductance $d{I}_1/d{V}_2$ has the opposite sign for Amperian pairing than it has either in the normal state or for the usual BCS pairing.

5 pages, 6 figures; v2 includes study of disorder and interface barrier

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Cited by in corpus (3)

• Amperean Pairing at the Surface of Topological Insulators
• Amperean superconductivity cannot be induced by deep subwavelength cavities in a two-dimensional material
• Tunneling and Josephson effects in odd-frequency superconductor junctions: A study on multi-channel Kondo chain