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

Here, we explore the second order bilinear magnetoelectric resistance (BMER) effect in the d-electron-based two-dimensional electron gas (2DEG) at the SrTiO 3 (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 SrTiO 3 (111) 2DEG is tunable and unexpectedly large.
Authors:
 [1] ;  [2] ;  [3] ;  [2] ;  [4] ;  [1] ;  [1] ;  [1] ;  [3] ;  [5] ;  [6] ;  [1]
  1. National Univ. of Singapore (Singapore). Dept. of Electrical and Computer Engineering and NUS Nanoscience & Nanotechnology Inst. (NUSNNI)
  2. Univ. of Geneva (Switzerland). Dept. of Quantum Matter Physics
  3. Argonne National Lab. (ANL), Argonne, IL (United States). Materials Science Division
  4. Univ. of Tokyo (Japan). Dept. of Applied Physics and Quantum-Phase Electronics Center; RIKEN Center for Emergent Matter Science (CEMS), Wako (Japan)
  5. Univ. of Missouri, Columbia, MO (United States). Dept. of Physics and Astronomy
  6. Univ. of Geneva (Switzerland). Dept. of Quantum Matter Physics; Paul Scherrer Inst. (PSI), Villigen (Switzerland). Swiss Light Source
Publication Date:
Grant/Contract Number:
AC02-06CH11357; NRFCRP12-2013-01; 200020-165791; PZ00P2-161327; JPMJCR16F1; DMR-1406568
Type:
Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 120; Journal Issue: 26; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Research Org:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org:
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)
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; magnetotransport; rashba coupling; spin texture; spin-orbit coupling; spintronics; two-dimensional electron gas
OSTI Identifier:
1462733
Alternate Identifier(s):
OSTI ID: 1457817

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., and Yang, Hyunsoo. Observation of Out-of-Plane Spin Texture in a SrTiO3(111) Two-Dimensional Electron Gas. United States: N. p., Web. doi:10.1103/PhysRevLett.120.266802.
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. Observation of Out-of-Plane Spin Texture in a SrTiO3(111) Two-Dimensional Electron Gas. United States. doi:10.1103/PhysRevLett.120.266802.
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., and Yang, Hyunsoo. 2018. "Observation of Out-of-Plane Spin Texture in a SrTiO3(111) Two-Dimensional Electron Gas". United States. doi:10.1103/PhysRevLett.120.266802.
@article{osti_1462733,
title = {Observation of Out-of-Plane Spin Texture in a SrTiO3(111) Two-Dimensional Electron Gas},
author = {He, Pan and Walker, S. McKeown and Zhang, Steven S. -L. and Bruno, F. Y. and Bahramy, M. S. and Lee, Jong Min and Ramaswamy, Rajagopalan and Cai, Kaiming and Heinonen, Olle and Vignale, Giovanni and Baumberger, F. and Yang, Hyunsoo},
abstractNote = {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.},
doi = {10.1103/PhysRevLett.120.266802},
journal = {Physical Review Letters},
number = 26,
volume = 120,
place = {United States},
year = {2018},
month = {6}
}

Works referenced in this record:

Tunable Rashba Spin-Orbit Interaction at Oxide Interfaces
journal, March 2010