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Topological insulators. --- Insulators, Topological --- Electric insulators and insulation --- Electronic apparatus and appliances --- Materials

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This book presents the observation and the control of spin-polarized electrons in Rashba thin films and topological insulators, including the first observations of a weak topological insulator (WTI) and a higher-order topological insulator (HOTI) in bismuth halides. It begins with a general review of electronic structures at the solid surface and mentions that an electron spin at a surface is polarized due to the Rashba effect or topological insulator states with strong spin-orbit coupling. Subsequently it describes the experimental techniques used to study these effects, that is, angle-resolved photoemission spectroscopy (ARPES). Further it moves its focus onto the experimental investigations, in which mainly two different systems-noble metal thin films with the Rashba effects and bismuth halides topological insulators-are used. The study of the first system discusses the role of wavefunctions in spin-splitting and demonstrates a scaling law for the Rashba effect in quantum well films for the first time. High-resolution spin-resolved ARPES plays a vital role in systematically trace the thickness-evolution of the effect. The study of the latter material is the first experimental demonstration of both a WTI and HOTI state in bismuth iodide and bismuth bromide, respectively. Importantly, nano-ARPES with high spatial resolution is used to confirm the topological surface states on the side surface of the crystal, which is the hallmark of WTIs. The description of the basic and recently-developed ARPES technique with spin-resolution or spatial-resolution, essential in investigating spin-polarized electrons at a crystal surface, makes the book a valuable source for researchers not only in surface physics or topological materials but also in spintronics and other condensed-matter physics.

Physics --- Surface chemistry --- Electronics --- oppervlakte-onderzoek --- elektronica --- Thin films. --- Nuclear spin. --- Topological insulators.

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Thin films. --- Nuclear spin. --- Topological insulators. --- Films, Thin --- Solid film --- Solid state electronics --- Solids --- Surfaces (Technology) --- Coatings --- Thick films --- Insulators, Topological --- Electric insulators and insulation --- Electronic apparatus and appliances --- Spin, Nuclear --- Angular momentum (Nuclear physics) --- Nuclear physics --- Materials

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The present collection of articles focuses on different aspects of topological-materials studies. Recent progress in both, theoretical and experimental, studies is covered in this Special Issue. A particular stress is given on different optical investigations, as well as on recent band-structure calculations. Besides, neutron scattering experiments, crystal growth, and a number of theoretical models for different topological systems are discussed.

Research & information: general --- Physics --- topological insulators --- optical conductivity --- Dirac materials --- Weyl nodes --- screw rotation symmetry --- line node --- space group 19 --- space group 61 --- cyclotron resonance --- crystal growth --- optical floating zone method --- SmB6 --- Sm1-xCexB6 --- topological insulator --- kondo insulator --- topology --- chirality --- multifold semimetal --- optics --- DFT --- topological semimetal --- cobalt monosilicide --- mechanical deformation --- quantum anomalous Hall effect --- Faraday rotation --- terahertz spectroscopy --- inelastic neutron scattering --- topological materials --- anomalous Hall effect --- isotropic ferromagnet --- kagome --- frustrated magnetism --- skyrmion --- magnetization --- optical-conductivity scaling --- topological semimetals --- band structures --- high Chern numbers --- bulk-edge correspondence --- Weyl semimetals --- band-structure calculations --- optical response --- n/a

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The present collection of articles focuses on different aspects of topological-materials studies. Recent progress in both, theoretical and experimental, studies is covered in this Special Issue. A particular stress is given on different optical investigations, as well as on recent band-structure calculations. Besides, neutron scattering experiments, crystal growth, and a number of theoretical models for different topological systems are discussed.

Research & information: general --- Physics --- topological insulators --- optical conductivity --- Dirac materials --- Weyl nodes --- screw rotation symmetry --- line node --- space group 19 --- space group 61 --- cyclotron resonance --- crystal growth --- optical floating zone method --- SmB6 --- Sm1-xCexB6 --- topological insulator --- kondo insulator --- topology --- chirality --- multifold semimetal --- optics --- DFT --- topological semimetal --- cobalt monosilicide --- mechanical deformation --- quantum anomalous Hall effect --- Faraday rotation --- terahertz spectroscopy --- inelastic neutron scattering --- topological materials --- anomalous Hall effect --- isotropic ferromagnet --- kagome --- frustrated magnetism --- skyrmion --- magnetization --- optical-conductivity scaling --- topological semimetals --- band structures --- high Chern numbers --- bulk-edge correspondence --- Weyl semimetals --- band-structure calculations --- optical response --- topological insulators --- optical conductivity --- Dirac materials --- Weyl nodes --- screw rotation symmetry --- line node --- space group 19 --- space group 61 --- cyclotron resonance --- crystal growth --- optical floating zone method --- SmB6 --- Sm1-xCexB6 --- topological insulator --- kondo insulator --- topology --- chirality --- multifold semimetal --- optics --- DFT --- topological semimetal --- cobalt monosilicide --- mechanical deformation --- quantum anomalous Hall effect --- Faraday rotation --- terahertz spectroscopy --- inelastic neutron scattering --- topological materials --- anomalous Hall effect --- isotropic ferromagnet --- kagome --- frustrated magnetism --- skyrmion --- magnetization --- optical-conductivity scaling --- topological semimetals --- band structures --- high Chern numbers --- bulk-edge correspondence --- Weyl semimetals --- band-structure calculations --- optical response