Tunneling spectra of layered strongly correlated d-wave superconductors

Details Tunneling spectra of layered strongly correlated d-wave superconductors Tunneling spectra of layered strongly correlated d-wave superconductors

2005-11-01

arxiv.org/abs/cond-mat/0511031v4

Phys. Rev. Lett. 97, 057003 (2006)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 3 figures. Added comment on the role of sample inhomogeneity. Published version. Homepage http://dao.mit.edu/~wen/

Scientific paper

10.1103/PhysRevLett.97.057003

Tunneling conductance experiments on cuprate superconductors exhibit a large diversity of spectra that appear in different nano-sized regions of inhomogeneous samples. In this letter, we use a mean-field approach to the tt't''J model in order to address the features in these spectra that deviate from the BCS paradigm, namely, the bias sign asymmetry at high bias, the generic lack of evidence for the Van Hove singularity, and the occasional absence of coherence peaks. We conclude that these features can be reproduced in homogeneous layered d-wave superconductors solely due to a proximate Mott insulating transition. We also establish the connection between the above tunneling spectral features and the strong renormalization of the electron dispersion around (0,pi) and (pi,0) and the momentum space anisotropy of electronic states observed in ARPES experiments.

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