Modeling of Tunneling Spectroscopy in High-Tc Superconductors

TL;DR

This paper presents a theoretical model for tunneling spectroscopy in high-Tc superconductors, incorporating band structure and gap symmetry, successfully reproducing experimental tunneling conductance features in Bi_2Sr_2CaCu_2O_8.

Contribution

The model integrates tight-binding band structure and d-wave symmetry to accurately simulate tunneling spectra, aligning well with experimental data.

Findings

Reproduces sub-gap conductance features

Matches experimental conductance peak asymmetry

Validates the model with Bi_2Sr_2CaCu_2O_8 data

Abstract

A theoretical model for tunneling spectroscopy employing tight-binding band structure, d-wave gap symmetry, group velocity, and tunneling directionality can exhibit a wide range of characteristics similar to the ones found in tunneling experiments on high-Tc superconductors. Using a band structure obtained for optimally-doped Bi_2Sr_2CaCu_2O_8, the model tunneling density of states produces a good comparison to the point-contact tunneling conductance on the same material, especially in the gap region, displaying the same sub-gap shape and conductance peaks asymmetry.