1. Cubic Rashba Effect in the Surface Spin Structure of Rare-Earth Ternary Materials
- Author
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Stefan E. Schulz, Kurt Kummer, Evgueni V. Chulkov, Alexander Generalov, M. Güttler, Eugene E. Krasovskii, Andrés F. Santander-Syro, Koji Miyamoto, Denis V. Vyalikh, I. A. Nechaev, Kristin Kliemt, A. P. Weber, Clemens Laubschat, A. Kraiker, Jaime Sánchez-Barriga, Steffen Danzenbächer, Taichi Okuda, T. Imai, D. Yu. Usachov, G. Poelchen, Cornelius Krellner, German Research Foundation, Agence Nationale de la Recherche (France), Ministerio de Ciencia, Innovación y Universidades (España), Ministerio de Economía y Competitividad (España), Agencia Estatal de Investigación (España), European Commission, Eusko Jaurlaritza, Saint Petersburg State University, Russian Foundation for Basic Research, and Helmholtz Association
- Subjects
Physics ,Condensed matter physics ,media_common.quotation_subject ,Rare earth ,Ab initio ,General Physics and Astronomy ,Spin structure ,01 natural sciences ,Asymmetry ,0103 physical sciences ,Antiferromagnetism ,Condensed Matter::Strongly Correlated Electrons ,010306 general physics ,Ternary operation ,Rashba effect ,Surface states ,media_common - Abstract
Spin-orbit interaction and structure inversion asymmetry in combination with magnetic ordering is a promising route to novel materials with highly mobile spin-polarized carriers at the surface. Spin-resolved measurements of the photoemission current from the Si-terminated surface of the antiferromagnet TbRh2Si2 and their analysis within an ab initio one-step theory unveil an unusual triple winding of the electron spin along the fourfold-symmetric constant energy contours of the surface states. A two-band k⋅p model is presented that yields the triple winding as a cubic Rashba effect. The curious in-plane spin-momentum locking is remarkably robust and remains intact across a paramagnetic-antiferromagnetic transition in spite of spin-orbit interaction on Rh atoms being considerably weaker than the out-of-plane exchange field due to the Tb 4f moments., This work was supported by the German Research Foundation (Grants No. KR-3831/5-1, No. LA655/20-1, GRK1621, Fermi-NESt No. ANR-16-CE92-0018, and SFB1143, project-id 247310070) and the Spanish Ministry of Science, Innovation, and Universities (Grant Nos. FIS2016-76617-P and MAT-2017-88374-P). We also acknowledge funding from the Department of Education of the Basque government (Grant No. IT1164-19), St. Petersburg State University (Project ID 51126254), and the Russian Foundation for Basic Research (Grant No. 20-32-70127). The SR-ARPES experiments at HiSOR were performed with the approval of the Proposal Assessing Committee of the Hiroshima Synchrotron Radiation Center (Proposal No. 18BG023). We also acknowledge the Impuls-und Vernetzungsfonds der Helmholtz Gemeinschaft (Grant No. HRSF-0067)
- Published
- 2020