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

He, Pan; Walker, S. McKeown; Zhang, Steven S. -L.; Bruno, F. Y.; Bahramy, M. S.; Lee, Jong Min; Ramaswamy, Rajagopalan; Cai, Kaiming; Heinonen, Olle; Vignale, Giovanni; Baumberger, F.; Yang, Hyunsoo

doi:10.1103/PhysRevLett.120.266802

Title: Observation of Out-of-Plane Spin Texture in a ${SrTiO}_{3} (111)$ Two-Dimensional Electron Gas

Journal Article · Fri Jun 29 00:00:00 EDT 2018 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.120.266802· OSTI ID:1462733

He, Pan ^[1]; Walker, S. McKeown ^[2]; Zhang, Steven S. -L. ^[3]; Bruno, F. Y. ^[2]; Bahramy, M. S. ^[4]; Lee, Jong Min ^[1]; Ramaswamy, Rajagopalan ^[1]; Cai, Kaiming ^[1]; Heinonen, Olle ^[3]; Vignale, Giovanni ^[5]; Baumberger, F. ^[6]; Yang, Hyunsoo ^[1]

National Univ. of Singapore (Singapore). Dept. of Electrical and Computer Engineering and NUS Nanoscience & Nanotechnology Inst. (NUSNNI)
Univ. of Geneva (Switzerland). Dept. of Quantum Matter Physics
Argonne National Lab. (ANL), Argonne, IL (United States). Materials Science Division
Univ. of Tokyo (Japan). Dept. of Applied Physics and Quantum-Phase Electronics Center; RIKEN Center for Emergent Matter Science (CEMS), Wako (Japan)
Univ. of Missouri, Columbia, MO (United States). Dept. of Physics and Astronomy
Univ. of Geneva (Switzerland). Dept. of Quantum Matter Physics; Paul Scherrer Inst. (PSI), Villigen (Switzerland). Swiss Light Source

Here, 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. Applying 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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Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; National Research Foundation of Korea (NRF); Swiss National Science Foundation (SNF); Japan Science and Technology Agency (JST); National Science Foundation (NSF)

Grant/Contract Number:: AC02-06CH11357; NRFCRP12-2013-01; 200020-165791; PZ00P2-161327; JPMJCR16F1; DMR-1406568

OSTI ID:: 1462733

Alternate ID(s):: OSTI ID: 1457817

Journal Information:: Physical Review Letters, Vol. 120, Issue 26; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 45 works

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References (46)

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Band Structure and Spin–Orbital Texture of the (111)‐KTaO ₃ 2D Electron Gas Bruno, Flavio Y.; McKeown Walker, Siobhan; Riccò, Sara Advanced Electronic Materials, Vol. 5, Issue 5 https://doi.org/10.1002/aelm.201800860	journal	March 2019
Nonlinear magnetotransport shaped by Fermi surface topology and convexity He, Pan; Hsu, Chuang-Han; Shi, Shuyuan Nature Communications, Vol. 10, Issue 1 https://doi.org/10.1038/s41467-019-09208-8	journal	March 2019
Nonreciprocal charge transport at topological insulator/superconductor interface Yasuda, Kenji; Yasuda, Hironori; Liang, Tian Nature Communications, Vol. 10, Issue 1 https://doi.org/10.1038/s41467-019-10658-3	journal	June 2019
Gate-tunable giant nonreciprocal charge transport in noncentrosymmetric oxide interfaces Choe, Daeseong; Jin, Mi-Jin; Kim, Shin-Ik Nature Communications, Vol. 10, Issue 1 https://doi.org/10.1038/s41467-019-12466-1	journal	October 2019
Coexistence of large conventional and planar spin Hall effect with long spin diffusion length in a low-symmetry semimetal at room temperature Song, Peng; Hsu, Chuang-Han; Vignale, Giovanni Nature Materials, Vol. 19, Issue 3 https://doi.org/10.1038/s41563-019-0600-4	journal	February 2020
Band Structure and Spin–Orbital Texture of the $(111)‐KTaO_{3}$ 2D Electron Gas Bruno, Flavio Y.; McKeown Walker, Siobhan; Riccò, Sara Deutsches Elektronen-Synchrotron, DESY, Hamburg https://doi.org/10.3204/pubdb-2019-05605	text	January 2019

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Title: Observation of Out-of-Plane Spin Texture in a SrTiO 3 ( 111 ) Two-Dimensional Electron Gas

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Title: Observation of Out-of-Plane Spin Texture in a ${SrTiO}_{3} (111)$ Two-Dimensional Electron Gas