Volume 114, Number 4, May 2016
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||14 June 2016|
Properties of the zero-energy Andreev bound state in a two-sublattice SNS junction
1 Department of Physics and Institute for Condensed Matter Theory, University of Illinois 1110 W. Green Street, Urbana, IL 61801, USA
2 Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences Beijing 100080, China
3 Department of Physics and Astronomy, Purdue University - West Lafayette, IN 47907, USA
Received: 22 April 2016
Accepted: 24 May 2016
We study properties of the zero energy Andreev bound state in a superconductor-normal metal-superconductor (SNS) junction consisting of two intrinsic degrees of freedom. The superconductors on either sides of the normal metal are assumed to have two sublattices with an intra-sublattice pairing with a phase equal to zero or π between the two sublattices. In addition, we add a uniform inter-sublattice pairing and study its effect on the local density of states (LDOS). In particular, we find that as the inter-sublattice pairing is turned on, the zero-bias peak (ZBP) is unstable (robust) when the phase difference across the sublattices is π (zero). We discuss the relevance of our results to the recently proposed odd-parity η pairing ground states in iron-based superconductors (FeSCs).
PACS: 74.45.+c – Proximity effects; Andreev reflection; SN and SNS junctions / 74.70.Xa – Pnictides and chalcogenides / 74.20.Rp – Pairing symmetries (other than s-wave)
© EPLA, 2016
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