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arXiv · 1806.01533

Observation of out-of-plane spin texture in a SrTiO3 (111) two-dimensional electron gas

Pan He·S. McKeown Walker·Steven S. -L. Zhang·F. Y. Bruno·M. S. Bahramy·Jongmin Lee·Rajagopalan Ramaswamy·Kaiming Cai·Olle Heinonen·Giovanni Vignale·F. Baumberger·Hyunsoo Yang
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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 an 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 six-fold 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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Pan He, S. McKeown Walker, Steven S. -L. Zhang, F. Y. Bruno, M. S. Bahramy, Jongmin Lee, Rajagopalan Ramaswamy, Kaiming Cai, Olle Heinonen, Giovanni Vignale, F. Baumberger, Hyunsoo Yang. 2018-06-05. Observation of out-of-plane spin texture in a SrTiO3 (111) two-dimensional electron gas. https://doi.org/10.1103/physrevlett.120.266802

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