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arXiv · 2110.06728

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

Ganesh Ji Omar·Weilong Kong·Hariom Jani·Mengsha Li·Jun Zhou·Zhi Shiuh Lim·Saurav Prakash·Shengwei Zeng·Sonu Hooda·Thirumalai Venkatesan·Yuan Ping Feng·Stephen J. Pennycook·Shen Lei·A. Ariando
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Abstract

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.

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Ganesh Ji Omar, Weilong Kong, Hariom Jani, Mengsha Li, Jun Zhou, Zhi Shiuh Lim, Saurav Prakash, Shengwei Zeng, Sonu Hooda, Thirumalai Venkatesan, Yuan Ping Feng, Stephen J. Pennycook, Shen Lei, A. Ariando. 2021-10-13. Experimental Evidence of t2g Electron-Gas Rashba Interaction Induced by Asymmetric Orbital Hybridization. https://doi.org/10.1103/physrevlett.129.187203

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