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Title

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

Authors
He, Pan
Zhang, Steven S.-L.
Bahramy, M. S.
Lee, Jong Min
Ramaswamy, Rajagopalan
Cai, Kaiming
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Published in Physical Review Letters. 2018, vol. 120, no. 266802, p. 1-5
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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HE, Pan et al. Observation of Out-of-Plane Spin Texture in a SrTiO3(111) Two-Dimensional Electron Gas. In: Physical Review Letters, 2018, vol. 120, n° 266802, p. 1-5. https://archive-ouverte.unige.ch/unige:109117

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Deposited on : 2018-10-12

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