Experimental Evidence of t2g Electron-Gas Rashba Interaction Induced by Asymmetric Orbital Hybridization

We report the control of Rashba spin-orbit interaction by tuning asymmetric hybridization between Ti-orbitals at the LaAlO3/SrTiO3 interface. This asymmetric orbital hybridization is modulated by introducing a LaFeO3 layer between LaAlO3 and SrTiO3, which alters the Ti-O lattice polarization and tra...

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Published inarXiv.org
Main Authors Ganesh Ji Omar, Kong, Weilong, Hariom Jani, Li, Mengsha, Zhou, Jun, Lim, Zhi Shiuh, Prakash, Saurav, Zeng, Shengwei, Hooda, Sonu, Venkatesan, Thirumalai, Feng, Yuan Ping, Pennycook, Stephen J, Shen, Lei, Ariando, A
Format Paper Journal Article
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 05.11.2022
Subjects
Electronic structure
Heterostructures
Physics - Applied Physics
Physics - Materials Science
Polarization
Strontium titanates
Titanium
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Summary:We report the control of Rashba spin-orbit interaction by tuning asymmetric hybridization between Ti-orbitals at the LaAlO3/SrTiO3 interface. This asymmetric orbital hybridization is modulated by introducing a LaFeO3 layer between LaAlO3 and SrTiO3, which alters the Ti-O lattice polarization and traps interfacial charge carriers, resulting in a large Rashba spin-orbit effect at the interface in the absence of an external bias. This observation is verified through high-resolution electron microscopy, magneto-transport and first-principles calculations. Our results open hitherto unexplored avenues of controlling Rashba interaction to design next-generation spin-orbitronics.
ISSN:2331-8422
DOI:10.48550/arxiv.2110.06728