Observation of a large-gap topological-insulator class with a single Dirac cone on the surface
Yuqi Xia,Dong Qian,Dong Qian,David Hsieh,Lewis Wray,Arijeet Pal,Hsin Lin,Arun Bansil,D. Grauer,Yew San Hor,Robert J. Cava,M. Z. Hasan +11 more
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TLDR
In this paper, an angle-resolved photo-emission spectroscopy study was conducted to reveal the first observation of a topological state of matter featuring a single surface Dirac cone realized in the naturally occurring Bi-2Se-3 class of materials.Abstract:
Recent experiments and theories have suggested that strong spin–orbit coupling effects in certain band insulators can give rise to a new phase of quantum matter, the so-called topological insulator, which can show macroscopic quantum-entanglement effects. Such systems feature two-dimensional surface states whose electrodynamic properties are described not by the conventional Maxwell equations but rather by an attached axion field, originally proposed to describe interacting quarks. It has been proposed that a topological insulator with a single Dirac cone interfaced with a superconductor can form the most elementary unit for performing fault-tolerant quantum computation. Here we present an angle-resolved photoemission spectroscopy study that reveals the first observation of such a topological state of matter featuring a single surface Dirac cone realized in the naturally occurring Bi_2Se_3 class of materials. Our results, supported by our theoretical calculations, demonstrate that undoped Bi_2Se_3 can serve as the parent matrix compound for the long-sought topological device where in-plane carrier transport would have a purely quantum topological origin. Our study further suggests that the undoped compound reached via n-to-p doping should show topological transport phenomena even at room temperature.read more
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Dynamics of reconfigurable artificial spin ice: towards magnonic functional materials
TL;DR: In this article, the authors review the resonant behavior of spin ices (which is in the GHz frequency range), focusing on their potential application as magnonic crystals, and discuss experimental, theoretical, and numerical methods for determining the spectral response of artificial spin icicles, and give an outlook on new directions for reconfigurable spin ice.
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Plasmonics in Topological Insulators: Spin–Charge Separation, the Influence of the Inversion Layer, and Phonon–Plasmon Coupling
TL;DR: In this article, the collective excitations of a thin slab of a topological insulator display spin-charge separation, which gives rise to purely charge-like optical and purely spin-like acoustic plasmons, respectively.
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Band structure engineering in topological insulator based heterostructures.
Tatiana V. Menshchikova,Mikhail M. Otrokov,Mikhail M. Otrokov,Stepan S. Tsirkin,Stepan S. Tsirkin,D. A. Samorokov,V. V. Bebneva,Arthur Ernst,Arthur Ernst,V. M. Kuznetsov,Eugene V. Chulkov,Eugene V. Chulkov +11 more
TL;DR: Using ab initio calculations, a promising way to control the conducting surface state in topological insulator based heterostructures representing an insulator ultrathin films on the topology insulator substrates is shown.
Journal ArticleDOI
Berry phase theory of planar Hall effect in topological insulators.
TL;DR: This paper presents a quasi-classical theory of another intriguing phenomenon in topological insulators – also ascribed to chiral anomaly in Weyl and Dirac semimetals– the so-called planar Hall effect (PHE).
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Structural and electronic properties of Bi2Se3 topological insulator thin films grown by pulsed laser deposition
Pasquale Orgiani,Chiara Bigi,Chiara Bigi,P. Kumar Das,P. Kumar Das,Jun Fujii,Regina Ciancio,B. Gobaut,Alice Galdi,Chiara Sacco,Luigi Maritato,Piero Torelli,G. Panaccione,Ivana Vobornik,Giorgio Rossi,Giorgio Rossi +15 more
TL;DR: In this article, the epitaxial growth of Bi2Se3 topological insulator thin films by Pulsed Laser Deposition (PLD) is reported, which shows that the topological surface state can be obtained in PLD-grown Bi2O3 thin films.
References
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Superconducting Proximity Effect and Majorana Fermions at the Surface of a Topological Insulator
Liang Fu,Charles L. Kane +1 more
TL;DR: It is shown that linear junctions between superconductors mediated by the topological insulator form a nonchiral one-dimensional wire for Majorana fermions, and that circuits formed from these junctions provide a method for creating, manipulating, and fusing Majorana bound states.