Zero-bias conductance peak splitting due to multiband effect in tunneling spectroscopy

Y. Tanuma; K. Kuroki; Y. Tanaka; S. Kashiwaya

doi:10.1103/PhysRevB.68.214513

paper

Zero-bias conductance peak splitting due to multiband effect in tunneling spectroscopy

arXiv:cond-mat/0306551 · doi:10.1103/PhysRevB.68.214513

Abstract

We study how the multiplicity of the Fermi surface affects the zero-bias peak in conductance spectra of tunneling spectroscopy. As case studies, we consider models for organic superconductors $κ$ -(BEDT-TTF) $_{2}$ Cu(NCS) $_{2}$ and (TMTSF) $_{2}$ ClO $_{4}$ . We find that multiplicity of the Fermi surfaces can lead to a splitting of the zero-bias conductance peak (ZBCP). We propose that the presence/absence of the ZBCP splitting is used as a probe to distinguish the pairing symmetry in $κ$ -(BEDT-TTF) $_{2}$ Cu(NCS) $_{2}$ .

7 pages, 7 figures