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Research Article
Anatase TiO2—A Model System for Large Polaron TransportClick to copy article linkArticle link copied!
- Bixing YanBixing YanNUSNNI-NanoCore, National University of Singapore, Singapore 117411, SingaporeDepartment of Physics, National University of Singapore, Singapore 117551, SingaporeMore by Bixing Yan
- Dongyang Wan*Dongyang Wan*E-mail: [email protected] (D.W.).NUSNNI-NanoCore, National University of Singapore, Singapore 117411, SingaporeDepartment of Physics, National University of Singapore, Singapore 117551, SingaporeMore by Dongyang Wan
- Xiao ChiXiao ChiDepartment of Physics, National University of Singapore, Singapore 117551, SingaporeSingapore Synchrotron Light Source, National University of Singapore, Singapore 117603, SingaporeMore by Xiao Chi
- Changjian LiChangjian LiDepartment of Material Science and Engineering, National University of Singapore, Singapore 117575, SingaporeMore by Changjian Li
- Mallikarjuna Rao MotapothulaMallikarjuna Rao MotapothulaNUSNNI-NanoCore, National University of Singapore, Singapore 117411, SingaporeMore by Mallikarjuna Rao Motapothula
- Sonu HoodaSonu HoodaNUSNNI-NanoCore, National University of Singapore, Singapore 117411, SingaporeMore by Sonu Hooda
- Ping YangPing YangSingapore Synchrotron Light Source, National University of Singapore, Singapore 117603, SingaporeMore by Ping Yang
- Zhen HuangZhen HuangNUSNNI-NanoCore, National University of Singapore, Singapore 117411, SingaporeMore by Zhen Huang
- Shengwei ZengShengwei ZengNUSNNI-NanoCore, National University of Singapore, Singapore 117411, SingaporeMore by Shengwei Zeng
- Akash Gadekar RameshAkash Gadekar RameshNUSNNI-NanoCore, National University of Singapore, Singapore 117411, SingaporeDepartment of Physics, National University of Singapore, Singapore 117551, SingaporeMore by Akash Gadekar Ramesh
- Stephen John PennycookStephen John PennycookDepartment of Material Science and Engineering, National University of Singapore, Singapore 117575, SingaporeMore by Stephen John Pennycook
- Andrivo RusydiAndrivo RusydiNUSNNI-NanoCore, National University of Singapore, Singapore 117411, SingaporeDepartment of Physics, National University of Singapore, Singapore 117551, SingaporeSingapore Synchrotron Light Source, National University of Singapore, Singapore 117603, SingaporeMore by Andrivo Rusydi
- Ariando*Ariando*E-mail: [email protected] (A.).NUSNNI-NanoCore, National University of Singapore, Singapore 117411, SingaporeDepartment of Physics, National University of Singapore, Singapore 117551, SingaporeMore by Ariando
- Jens Martin*Jens Martin*E-mail: [email protected] (J.M.).Department of Physics and Center for Advanced 2D Material, National University of Singapore, Singapore 117551, SingaporeMore by Jens Martin
- Thirumalai Venkatesan*Thirumalai Venkatesan*E-mail:[email protected] (T.V.).NUSNNI-NanoCore, National University of Singapore, Singapore 117411, SingaporeDepartment of Physics, National University of Singapore, Singapore 117551, SingaporeDepartment of Material Science and Engineering, National University of Singapore, Singapore 117575, SingaporeNUS Graduate School for Integrative Sciences and Engineering, National University of Singapore, Singapore 117456, SingaporeDepartment of Electrical and Computer Engineering, National University of Singapore, Singapore 117583, SingaporeMore by Thirumalai Venkatesan
Abstract
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Large polarons have been of significant recent technological interest as they screen and protect electrons from point-scattering centers. Anatase TiO2 is a model system for studying large polarons as they can be studied systematically over a wide range of temperature and carrier density. The electronic and magneto transport properties of reduced anatase TiO2 epitaxial thin films are analyzed considering various polaronic effects. Unexpectedly, with increasing carrier concentration, the mobility increases, which rarely happens in common metallic systems. We find that the screening of the electron–phonon (e–ph) coupling by excess carriers is necessary to explain this unusual dependence. We also find that the magnetoresistance could be decomposed into a linear and a quadratic component, separately characterizing the carrier transport and trapping as a function of temperature, respectively. The various transport behaviors could be organized into a single phase diagram, which clarifies the evolution of large polaron in this material.
Copyright © 2018 American Chemical Society
Cited By
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This article is cited by 19 publications.
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