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2D Small Hole Polarons in Ga₂O₃.

Hartwin Peelaers¹, Joel B Varley², Chris G Van de Walle³

¹Department of Physics and Astronomy, University of Kansas, Lawrence, Kansas 66045, United States.

|July 15, 2026

Summary

Researchers studied polarons in gallium oxide (Ga2O3) nanolayers. They found polarons can form on oxygen atoms, with some configurations being stable and others metastable, potentially observable with advanced microscopy.

Keywords:

2D Ga2O3 hybrid DFT metastable observation small hole polaron

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Area of Science:

Materials Science
Condensed Matter Physics
Computational Materials Science

Background:

Holes in oxides like gallium oxide (Ga2O3) are known to localize and distort the lattice, forming small polarons.
Previous research has established the phenomenon of polaron formation in bulk oxide materials.

Purpose of the Study:

To investigate the formation and characteristics of polarons in experimentally demonstrated (100) Ga2O3 nanolayers.
To determine the preferred localization sites for polarons within the Ga2O3 nanostructure.

Main Methods:

Utilized density functional theory (DFT) calculations at the hybrid functional level.
Simulated polaron formation in 2D (100) Ga2O3 nanolayers.

Main Results:

Polarons can localize on oxygen atoms in Ga2O3 nanolayers.
Two distinct 3-fold coordinated oxygen sites result in stable polarons.
A 4-fold coordinated oxygen site leads to a metastable polaron, involving Ga-O bond breaking and significant Ga atom displacement.

Conclusions:

The study identifies specific oxygen sites responsible for stable and metastable polaron formation in Ga2O3 nanolayers.
The predicted large atomic displacement for metastable polarons suggests a pathway for experimental observation using high-resolution transmission electron microscopy (HRTEM).