Volume 69, Number 5, March 2005
|Page(s)||791 - 797|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||11 February 2005|
Andreev edge state on semi-infinite triangular lattice: Detecting the pairing symmetry in
Kavli Institute for Theoretical Physics, University of California Santa Barbara, CA 93106,USA
2 Department of Physics and Astronomy, University of British Columbia Vancouver, B.C. V6T 1Z1, Canada
3 Physics Division, National Center for Theoretical Sciences - Hsinchu 300, Taiwan
Accepted: 10 January 2005
We study the Andreev edge state on the semi-infinite triangular lattice with different pairing symmetries and boundary topologies. We find a rich phase diagram of zero-energy Andreev edge states that is a unique fingerprint of each of the possible pairing symmetries. We propose to pin down the pairing symmetry in recently discovered x material by the Fourier-transformed scanning tunneling spectroscopy for the edge state. A surprisingly rich phase diagram is found and explained by a general gauge argument and mapping to 1D tight-binding model. Extensions of this work are discussed at the end.
PACS: 74.78.-w – Superconducting films and low-dimensional structures / 74.20.-z – Theories and models of superconducting state / 74.45.+c – Proximity effects; Andreev effect; SN and SNS junctions
© EDP Sciences, 2005
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