Polarization-dependent ARPES study of La1-xSrxMnO3

TL;DR

This study uses polarization-dependent ARPES to analyze the electronic band structure of La1-xSrxMnO3 thin films, revealing symmetry properties of low-energy states and their dispersions.

Contribution

It provides detailed symmetry analysis of electronic bands in La1-xSrxMnO3 using polarization-dependent ARPES, offering new insights into its surface and bulk electronic states.

Findings

Identified two dispersing energy bands along different crystallographic directions.

Determined the symmetry properties of the initial electronic states.

Derived the spatial wave function expressions for low-energy states.

Abstract

We present angle-resolved photoemission spectroscopy results on thin films of the three-dimensional manganite perovskite La1-xSrxMnO3, with TC = 240 K. In the low-binding energy region, we found two energy bands, one dispersing along the (100) sample surface and the other along the normal to the surface. Through a detailed polarization-dependent analysis, we have determined the symmetries of the two bands. The initial states associated with the band that disperses along the surface are dominantly odd with respect to the (110) mirror plane and even with respect to the (010) mirror plane. Based upon this investigation, we have derived the expression of the spatial term for the wave functions describing these low-energy states.