Tunneling conductance and local density of states in tight-binding junctions

Details Tunneling conductance and local density of states in tight-binding junctions Tunneling conductance and local density of states in tight-binding junctions

2011-02-18

arxiv.org/abs/1102.3895v2

Phys. Rev. B 84, 155414 (2011)

Physics

Condensed Matter

Superconductivity

Published version

Scientific paper

10.1103/PhysRevB.84.155414

We study the relationship between the differential conductance and the local density of states in tight-binding tunnel junctions where the junction' geometry can be varied between the point-contact and the planar-contact limits. The conductances are found to differ significantly in these two limiting cases. We also examine how the matrix element influences the tunneling characteristics and produces contrast in a simple model of scanning tunneling microscope (STM). Some implications regarding the interpretation of STM spectroscopic data in the cuprates are discussed. The calculations are carried out within the real-space Keldysh formalism.

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