[Zurück]

Z. Zhong, L. Si, Q. Zhang, W.-G. Yin, S. Yunoki, K. Held:
"Giant Switchable Rashba Effect in Oxide Heterostructures";
Advanced Materials Interfaces, 2 (2015), S. 1400445-1 - 1400445-5.

One of the most fundamental phenomena and a reminder of the electron's relativistic nature is the Rashba spin splitting for broken inversion symmetries in two-dimensional condensed matter systems. Typically, this splitting is a tiny relativistic correction. By coupling ferroelectric BaTiO3 and a 5d (or 4d) transition metal oxide with a large spin-orbit coupling, Ba(Os,Ir,Ru)O3, it is shown that giant Rashba spin splittings are indeed possible and even controllable by an external electric field. Based on density functional theory and a microscopic tight binding understanding, it is concluded that the electric field is amplified and stored as a ferroelectric Ti-O distortion which, through the network of oxygen octahedra, induces a large (Os,Ir,Ru)-O distortion. The BaTiO3/Ba(Os,Ru,Ir)O3 heterostructure is hence the ideal test station for switching and studying the Rashba effect and allows applications at room temperature.

http://dx.doi.org/10.1002/admi.201400445