Berlin 2018 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 43: Spintronics (joint session HL/TT)

HL 43.8: Vortrag

Donnerstag, 15. März 2018, 17:00–17:15, EW 201

Giant Bulk Rashba Splitting — •Louis Ponet and Sergey Artyukhin — Via Morega 30, 16163 Genova, Italy

Spintronics has been an exciting area in the last decades, due to a promise for devices that exploit the existence of spin-polarized states [1]. Important applications include storage media, where the use of spins to store data has been widespread since the earliest days of computing. An important challenge is the control of these states. Magnetic field control precludes further miniaturization. Possible solutions may include spin torques provided by spin-polarized currents. For use in electronic applications, there is a pressing need for electric control of the states, which was recently demonstrated in materials that showcase an anomalously large Rashba-effect [2]. Our research focused on quantitative description of the orbital Rashba-effect [3], an electrostatic effect that couples orbital angular momentum to the polarization. Due to its non-relativistic nature, the effect can be many orders of magnitude larger than would be expected from the spin Rashba-effect. We used model Hamiltonians and ab-initio calculations to examine the effect and outline the design principles for promising compounds.

References [1] S. D. Bader and S. S. P. Parkin, Spintronics Ann. Rev. Cond. Matt. Phys. 1, 71 (2010). [2] D. Di Sante, P. Barone, R. Bertacco, S. Picozzi, Advanced Materials, 25, 509 (2013). [3] Park J. H., Kim C. H., Rhim J. W., Han J. H., Phys. Rev. B 85, 195401 (2012).