Multiple Bosonic Mode Coupling in Electron Self-Energy of (La_2-xSr_x)CuO_4

TL;DR

This study uses high-resolution photoemission spectroscopy to identify multiple bosonic modes coupling with electrons in underdoped LSCO, revealing complex interactions in the material's normal state.

Contribution

It provides evidence for multiple bosonic modes involved in electron coupling in LSCO, a novel insight into its electronic interactions.

Findings

Identification of fine structure at 40-46 meV and 58-63 meV

Possible additional structures at 23-29 meV and 75-85 meV

More than one bosonic mode involved in electron coupling

Abstract

High resolution angle-resolved photoemission spectroscopy data along the (0,0)-($\pi$,$\pi$) nodal direction with significantly improved statistics reveal fine structure in the electron self-energy of the underdoped (La$_{2-x}$Sr$_x$)CuO$_4$ samples in the normal state. Fine structure at energies of (40$\sim$46) meV and (58$\sim$63)meV, and possible fine structure at energies of (23$\sim$29)meV and (75$\sim$85)meV, have been identified. These observations indicate that, in LSCO, more than one bosonic modes are involved in the coupling with electrons.