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Real-space investigation of polarons in hematite Fe 2 O 3
Redondo, Jesus, Reticcioli, Michele, Gabriel, Vit, Wrana, Dominik, Ellinger, Florian, Riva, Michele, Franceschi, Giada, Rheinfrank, Erik, Sokolović, Igor, Jakub, Zdenek, Kraushofer, Florian, Alexander, Aji, Belas, Eduard, Patera, Laerte L.
, Repp, Jascha
, Schmid, Michael, Diebold, Ulrike, Parkinson, Gareth S., Franchini, Cesare, Kocan, Pavel and Setvin, Martin
(2024)
Real-space investigation of polarons in hematite Fe 2 O 3.
Science Advances 10 (44), eadp7833.
Date of publication of this fulltext: 06 Nov 2024 11:36
Article
DOI to cite this document: 10.5283/epub.59495
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, ...
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.
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| Item type | Article | ||||
| Journal or Publication Title | Science Advances | ||||
| Publisher: | Science | ||||
|---|---|---|---|---|---|
| Volume: | 10 | ||||
| Number of Issue or Book Chapter: | 44 | ||||
| Page Range: | eadp7833 | ||||
| Date | 1 November 2024 | ||||
| Institutions | Physics > Institute of Experimental and Applied Physics > Group Jascha Repp | ||||
| Identification Number |
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| Dewey Decimal Classification | 500 Science > 530 Physics 500 Science > 540 Chemistry & allied sciences | ||||
| Status | Published | ||||
| Refereed | Yes, this version has been refereed | ||||
| Created at the University of Regensburg | Partially | ||||
| URN of the UB Regensburg | urn:nbn:de:bvb:355-epub-594954 | ||||
| Item ID | 59495 |
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