Projects per year
Abstract
In polarizable materials, electronic charge carriers interact with the surrounding ions, leading to quasiparticle behavior. The resulting polarons play a central role in many materials properties including electrical transport, interaction with light, surface reactivity, and magnetoresistance, and polarons are typically investigated indirectly through these macroscopic characteristics. Here, noncontact atomic force microscopy (nc-AFM) is used to directly image polarons in Fe2O3 at the single quasiparticle limit. A combination of Kelvin probe force microscopy (KPFM) and kinetic Monte Carlo (KMC) simulations shows that the mobility of electron polarons can be markedly increased by Ti doping. Density functional theory (DFT) calculations indicate that a transition from polaronic to metastable free-carrier states can play a key role in migration of electron polarons. In contrast, hole polarons are significantly less mobile, and their hopping is hampered further by trapping centers.
Original language | English |
---|---|
Article number | eadp7833 |
Number of pages | 8 |
Journal | Science Advances |
Volume | 10 |
Issue number | 44 |
DOIs | |
Publication status | Published - Nov 2024 |
Austrian Fields of Science 2012
- 103015 Condensed matter
Fingerprint
Dive into the research topics of 'Real-space investigation of polarons in hematite Fe2O3'. Together they form a unique fingerprint.Projects
- 1 Active
-
TACO: Taming Complexity in Materials Modeling
Diebold, U., Kresse, G., Mezger-Backus, E. H. G., Dellago, C. & Franchini, C.
1/03/21 → 28/02/29
Project: Research funding