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Observation of Out-of-Plane Spin Texture in a SrTiO3(111) Two-Dimensional Electron Gas

Published inPhysical Review Letters, vol. 120, no. 266802, p. 1-5
Publication date2018
Abstract

We explore the second order bilinear magnetoelectric resistance (BMER) effect in the d-electron-based two-dimensional electron gas (2DEG) at the SrTiO3 (111) surface. We find evidence of a spin-split band structure with the archetypal spin-momentum locking of the Rashba effect for the in-plane component. Under an out-of-plane magnetic field, we find a BMER signal that breaks the sixfold symmetry of the electronic dispersion, which is a fingerprint for the presence of a momentum-dependent out-of-plane spin component. Relativistic electronic structure calculations reproduce this spin texture and indicate that the out-of-plane component is a ubiquitous property of oxide 2DEGs arising from strong crystal field effects. We further show that the BMER response of the SrTiO3 (111) 2DEG is tunable and unexpectedly large.

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Citation (ISO format)
HE, Pan et al. Observation of Out-of-Plane Spin Texture in a SrTiO<sub>3</sub>(111) Two-Dimensional Electron Gas. In: Physical Review Letters, 2018, vol. 120, n° 266802, p. 1–5. doi: 10.1103/PhysRevLett.120.266802
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ISSN of the journal0031-9007
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