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Title: Anatase TiO2-A Model System for Large Polaron Transport
Authors: Yan, Bixing
Wan, Dongyang
Chi, Xiao 
Li, Changjian 
Motapothula, Mallikarjuna Rao 
Hooda, Sonu
Yang, Ping 
Huang, Zhen 
Zeng, Shengwei 
Ramesh, Akash Gadekar 
Pennycook, Stephen John 
Rusydi, Andrivo 
Martin, Jens 
Venkatesan, Thirumalai 
Keywords: anatase TiO 2
electron-phonon interaction
electronic transport
large polaron
Issue Date: 17-Oct-2018
Publisher: American Chemical Society
Citation: Yan, Bixing, Wan, Dongyang, Chi, Xiao, Li, Changjian, Motapothula, Mallikarjuna Rao, Hooda, Sonu, Yang, Ping, Huang, Zhen, Zeng, Shengwei, Ramesh, Akash Gadekar, Pennycook, Stephen John, Rusydi, Andrivo, Ariando, Martin, Jens, Venkatesan, Thirumalai (2018-10-17). Anatase TiO2-A Model System for Large Polaron Transport. ACS APPLIED MATERIALS & INTERFACES 10 (44) : 38201 - 38208. ScholarBank@NUS Repository.
Abstract: Large polarons have been of significant recent technological interest as they screen and protect electrons from point-scattering centers. Anatase TiO 2 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 TiO 2 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.
ISSN: 19448244
Appears in Collections:Elements
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