Origin of the Electron-Hole Asymmetry in the Scanning Tunneling Spectrum of the High-Temperature Bi2Sr2CaCu2O8+δ Superconductor
Jouko Nieminen, Hsin Lin, R. S. Markiewicz, A. Bansil
DOI 10.1103/PhysRevLett.102.037001 · Physical Review Letters
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Abstract
We have developed a material specific theoretical framework for modeling scanning tunneling spectroscopy (STS) of high-temperature superconducting materials in the normal as well as the superconducting state. Results for Bi2Sr2CaCu2O8+δ (Bi2212) show clearly that the tunneling process strongly modifies the STS spectrum from the local density of states of the dx2−y2 orbital of Cu. The dominant tunneling channel to the surface Bi involves the dx2−y2 orbitals of the four neighboring Cu atoms. In accord with experimental observations, the computed spectrum displays a remarkable asymmetry between the processes of electron injection and extraction, which arises from contributions of Cu dz2 and other orbitals to the tunneling current.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Bi2Sr2CaCu2O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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