2017/07/27 by A. M. Shikin, D. M. Sostina, А. А. Рыбкина +25 · 21 citations
Physics and Astronomy · #Advanced Condensed Matter Physics #Atomic physics #Condensed matter physics #Excited state #Magnetic field #Magnetization #Optics #Photoexcitation #Physics #Quantum and electron transport phenomena #Quantum mechanics #Spin (aerodynamics) #Synchrotron radiation #Topological Materials and Phenomena #Topological insulator #cond-mat.mtrl-sci
paper · pdf · doi:10.1103/physrevb.97.245407
published in Physical review. B./Physical review. B 97(24) (American Physical Society) · 17 pages, 8 figures
arxiv created 2017/07/27 · openalex created_date 2017/08/08 · openalex publication_date 2018/06/11 · arxiv updated 2018/06/20 · openalex updated_date 2026/08/05
Possibility of in-plane and out-of-plane magnetization generated by synchrotron radiation (SR) in magnetically doped and pristine topological insulators (TIs) is demonstrated and studied by angle-resolved photoemission spectroscopy. We show experimentally and by ab initio calculations how nonequal depopulation of the Dirac cone (DC) states with opposite momenta in V-doped and pristine TIs generated by linearly polarized SR leads to the hole-generated uncompensated spin accumulation followed by the SR-induced magnetization via spin-torque effect. Moreover, the photoexcitation of the DC is asymmetric, and it varies with the photon energy. We find a relation between the photoexcitation asymmetry, the generated spin accumulation, and the induced in-plane and out-of-plane magnetic field. Experimentally the SR-generated in-plane and out-of-plane magnetization is confirmed by the k_\ensuremath∥ shift of the DC position and by the gap opening at the Dirac point even above the Curie temperature. Theoretical predictions and estimations of the measurable physical quantities substantiate the experimental results.