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We study how the multiplicity of the Fermi surface affects the zero-bias peakin conductance spectra of tunneling spectroscopy. As case studies, we considermodels for organic superconductors $\kappa$-(BEDT-TTF)$_2$Cu(NCS)$_2$ and(TMTSF)$_2$ClO$_4$. We find that multiplicity of the Fermi surfaces can lead toa splitting of the zero-bias conductance peak (ZBCP). We propose that thepresence/absence of the ZBCP splitting is used as a probe to distinguish thepairing symmetry in $\kappa$-(BEDT-TTF)$_2$Cu(NCS)$_2$.Comment: 7 pages, 7 figure

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