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dc.contributor.authorFilnov, S. O.es_ES
dc.contributor.authorKlimovskikh, Ilya I.es_ES
dc.contributor.authorEstyunin, D.es_ES
dc.contributor.authorFedorov, Alexanderes_ES
dc.contributor.authorVoroshnin, Vladimir Yu.es_ES
dc.contributor.authorKoroleva, A. V.es_ES
dc.contributor.authorRybkin, Artem G.es_ES
dc.contributor.authorShevchenko, E. V.es_ES
dc.contributor.authorAliev, Ziya S.es_ES
dc.contributor.authorBabanly, M. B.es_ES
dc.contributor.authorAmiraslanov, I. R.es_ES
dc.contributor.authorMamedov, Nazim T.es_ES
dc.contributor.authorSchwier, E. F.es_ES
dc.contributor.authorMiyamoto, Kojies_ES
dc.contributor.authorOkuda, Taichies_ES
dc.contributor.authorKumar, S.es_ES
dc.contributor.authorKimura, A.es_ES
dc.contributor.authorMisheneva, V. M.es_ES
dc.contributor.authorShikin, Alexander M.es_ES
dc.contributor.authorChulkov, Eugene V.es_ES
dc.identifier.citationPhysical Review B 102(8): 085149 (2020)es_ES
dc.description.abstractA tunable gap in the topological surface state is of great interest for novel spintronic devices and applications in quantum computing. Here, we study the surface electronic structure and magnetic properties of the Gd-doped topological insulator TlBi0.9Gd0.1Se2. Utilizing superconducting quantum interference device magnetometry, we show paramagnetic behavior down to 2 K. Combining spin- and angle-resolved photoemission spectroscopy with different polarizations of light, we demonstrate that the topological surface state is characterized by the Dirac cone with a helical spin structure and confirm its localization within the bulk band gap. By using different light sources in photoemission spectroscopy, various Dirac-point gap values were observed: 50 meV for hν=18eV and 20 meV for hν=6.3eV. Here, we discuss the gap observation by the angle-resolved photoemission spectroscopy method as a consequence of the scattering processes. Simulating the corresponding spectral function, we demonstrate that the asymmetric energy-distribution curve of the surface state leads to an overestimation of the corresponding gap value. We speculate that 20 meV in our case is a trustworthy value and attribute this gap to be originated by scattering both on magnetic and charge impurities provided by Gd atoms and surface defects. Given the complexity and importance of scattering processes in the topological surface state together with our observations of distinctive photoemission asymmetry, we believe our results are important for research of the massive Dirac fermions in novel quantum materials.es_ES
dc.description.sponsorshipThis work was supported by St. Petersburg State University Project (ID No. 51126254), by the Russian Science Foundation (Grant No. 18-12-00062), by the Ministry of Science and Higher Education of the Russian Federation (Grant No 2020-1902-01-058), and by the Science Development Foundation under the President of the Republic of Azerbaijan (Grant No. EIF-BGM-4-RFTF-1/2017-1/04/1-M-02). The studies were also carried out at the resource centers of St. Petersburg State University “Physical Methods for Surface Investigation” and “Diagnosis of Functional Materials for Medicine, Pharmacology, and Nanoelectronics.” In addition, the work was supported by the German-Russian Interdisciplinary Science Center (G-RISC) funded by the German Federal Foreign Office via the German Academic Exchange Service (DAAD) and Russian-German Laboratory at BESSY II (Helmholtz Zentrum, Berlin). We thank the Hiroshima Synchrotron Radiation Center (Proposal No. 18BG026), Helmholtz-Zentrum Berlin für Materialien und Energie for the allocation of synchrotron radiation beam times, and the N-BARD, Hiroshima University for supplying liquid helium. A.K. was financially supported by KAKENHI (Grants No. 17H06138, No. 17H06152, and No. 18H03683).es_ES
dc.publisherAmerican Physical Societyes_ES
dc.relation.isversionofPublisher's versiones_ES
dc.titleProbe-dependent Dirac-point gap in the gadolinium-doped thallium-based topological insulator TlBi0.9Gd0.1Se2es_ES
dc.description.peerreviewedPeer reviewedes_ES
dc.contributor.funderSaint Petersburg State Universityes_ES
dc.contributor.funderRussian Science Foundationes_ES
dc.contributor.funderMinistry of Science and Higher Education of the Russian Federationes_ES
dc.contributor.funderScience Development Foundation under the President of the Republic of Azerbaijanes_ES
dc.contributor.funderFederal Foreign Office (Germany)es_ES
dc.contributor.funderGerman Academic Exchange Servicees_ES
dc.contributor.funderHelmholtz-Zentrum Berlin for Materials and Energyes_ES
dc.contributor.funderHiroshima Universityes_ES
dc.contributor.funderJapan Society for the Promotion of Sciencees_ES
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