Theoretical study on isotopic shift in angle-resolved photoemission spectra of Bi2Sr2CaCu2O8
Kai Ji, Keiichiro Nasu
TL;DR
This paper develops a path-integral theoretical framework to analyze the isotopic shift in ARPES spectra of high-T_c superconductor Bi2Sr2CaCu2O8, highlighting the role of electron-phonon interactions.
Contribution
It introduces a novel path-integral approach to model ARPES spectra considering both electron-electron and electron-phonon interactions in high-T_c superconductors.
Findings
Isotopic band shift in ARPES is caused by off-diagonal quadratic e-ph coupling.
Electron-electron repulsion partially suppresses the isotopic shift.
Theoretical results align with experimental observations.
Abstract
We develop a path-integral theory to study the angle-resolved photoemission spectra (ARPES) of high-T_c superconductors based on a two-dimensional model for the CuO2 conduction plane, including both electron-electron (e-e) and electron-phonon (e-ph) interactions. Comparing our result with the experimental one of Bi2Sr2CaCu2O8, we find that the experimentally observed isotopic band shift in ARPES is due to the off-diagonal quadratic e-ph coupling, whereas the presence of e-e repulsion partially suppresses this effect.
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