Evidence of linear and cubic Rashba effect in non-magnetic heterostructure. (24th May 2023)

• Record Type: Journal Article
• Authors: Bhattacharya, Sanchari; Datta, Sanjoy
• Is Part Of: Journal of physics. Volume 35:Number 20(2023)
• Publication Date: 2023-05-24
• Subjects: non-magnetic heterostructure -- spin-orbitronics -- Rashba -- photogalvanic effect; Condensed matter -- Periodicals; Matière condensée -- Périodiques; Vaste stoffen; Vloeistoffen; Natuurkunde; Electronic journals; Computer network resources; 530.4105
• DOI: 10.1088/1361-648X/acbf94
• Languages: English
• ISSNs: 0953-8984

Abstract

Abstract: The L a A l O 3 / K T a O 3 system serves as a prototype to study the electronic properties that emerge as a result of spin–orbit coupling (SOC). In this article, we have used first-principles calculations to systematically study two types of defect-free (0 0 1) interfaces, which are termed as Type-I and Type-II. While the Type-I heterostructure produces a two dimensional (2D) electron gas, the Type-II heterostructure hosts an oxygen-rich 2D hole gas at the interface. Furthermore, in the presence of intrinsic SOC, we have found evidence of both cubic and linear Rashba interactions in the conduction bands of the Type-I heterostructure. On the contrary, there is spin-splitting of both the valence and the conduction bands in the Type-II interface, which are found to be only linear Rashba type. Interestingly, the Type-II interface also harbors a potential photocurrent transition path, making it an excellent platform to study the circularly polarized photogalvanic effect.