Discrete-Lattice Model for Surface Bound States and Tunneling in d-Wave Superconductors

Details Discrete-Lattice Model for Surface Bound States and Tunneling in d-Wave Superconductors Discrete-Lattice Model for Surface Bound States and Tunneling in d-Wave Superconductors

1998-03-06

arxiv.org/abs/cond-mat/9803079v1

Phys. Rev. B59,1421 (1999)

Physics

Condensed Matter

Superconductivity

4 pages, 1 figure, revtex

Scientific paper

10.1103/PhysRevB.59.1421

Surface bound states in a discrete-lattice model of a $d_{x^2 - y^2}$ cuprate superconductor are shown to be, in general, coherent superpositions of an incoming excitation and more than one outgoing excitation, and a simple graphical construction based on a surface Brillouin zone is developed to describe their nature. In addition, a momentum-dependent lifetime contribution to the width of these bound states as observed in tunneling experiments is derived and elucidated in physical terms.

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