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Coexistence of Both Localized Electronic States and Electron Gas at Rutile TiO 2 Surfaces.
- Source :
-
Advanced materials (Deerfield Beach, Fla.) [Adv Mater] 2023 Jul; Vol. 35 (30), pp. e2301453. Date of Electronic Publication: 2023 Jun 11. - Publication Year :
- 2023
-
Abstract
- Localized electron polarons formed through the coupling of excess electrons and ionic vibrations play a key role in the functionalities of materials. However, the mechanism of the coexistence of delocalized electrons and localized polarons remains underexplored. Here, the discovery of high-mobility 2D electron gas at the rutile TiO <subscript>2</subscript> surfaces through argon ion irradiation induced oxygen vacancies is reported. Strikingly, the electron gas forms localized electronic states at lower temperatures, resulting in an abrupt metal-insulator transition. Moreover, it is found that the low-temperature conductivity in the insulating state is dominated by excess free electrons with a high mobility of ≈10 <superscript>3</superscript> cm <superscript>2</superscript> V <superscript>-1</superscript> s <superscript>-1</superscript> , whereas the carrier density is dramatically suppressed with decreasing temperature. Remarkably, it reveals that the application of an electric field can lead to a collapse of the localized states, resulting in a metallic state. These results reveal the strongly correlated/coupled nature between the localized electrons and high-mobility electrons and offer a new pathway to probe and harvest the exotic electron states at the complex oxide surfaces.<br /> (© 2023 Wiley-VCH GmbH.)
Details
- Language :
- English
- ISSN :
- 1521-4095
- Volume :
- 35
- Issue :
- 30
- Database :
- MEDLINE
- Journal :
- Advanced materials (Deerfield Beach, Fla.)
- Publication Type :
- Academic Journal
- Accession number :
- 37096832
- Full Text :
- https://doi.org/10.1002/adma.202301453