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

Y. Tanuma·K. Kuroki·Y. Tanaka·S. Kashiwaya
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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)$_2$.

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Y. Tanuma, K. Kuroki, Y. Tanaka, S. Kashiwaya. 2003-06-22. Zero-bias conductance peak splitting due to multiband effect in tunneling spectroscopy. https://doi.org/10.1103/physrevb.68.214513

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