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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Gap closing and universal phase diagrams in topological insulators
TL;DR: In this article, a general problem of how the gap in a nonmagnetic band insulator closes by tuning a parameter was studied, and it was shown that the gap closings correspond to phase transitions between the quantum spin Hall and the insulator phases.
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Dependence of superconductivity in Cu{x}Bi{2}Se{3} on quenching conditions
TL;DR: In this article, the effects of various growth and post-annealing conditions on the superconductivity of CuxBi₂Se₃ have been investigated and improved on the finite superconducting volume fractions.
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Electrical transport properties and morphology of topological insulator Bi2Se3 thin films with different thickness prepared by magnetron sputtering
Min Zhang,Zhantao Wei,Jin Rong,Yaxin Ji,Yong Yan,Pu Xiaoyan,Xinsheng Yang,Yong Zhao,Yong Zhao +8 more
TL;DR: In this article, topological insulator Bi 2 Se 3 thin films were grown by magnetron sputtering on Si (1 0 0) substrate and their phase structures and electrical properties were studied.
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Coherent optical phonons in a Bi2Se3 single crystal measured via transient anisotropic reflectivity
Katsura Norimatsu,Jianbo Hu,Arihiro Goto,Kyushiro Igarashi,Takao Sasagawa,Kazutaka G. Nakamura +5 more
TL;DR: In this paper, the frequency, damping rate, and initial phase of coherent optical E g phonons were obtained by using femtosecond transient anisotropic reflection measurements in addition to A 1g 1 and E g 2 phonons.
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Towards spin injection from silicon into topological insulators: Schottky barrier between Si and Bi2Se3
Claudia Ojeda-Aristizabal,Michael S. Fuhrer,Nicholas P. Butch,Johnpierre Paglione,Ian Appelbaum +4 more
TL;DR: In this article, the spin-momentum coupling in the topological insulator surface state by injection of spin polarized electrons from silicon was measured using spin-polarized exfoliated crystals of Bi2Se3 on n-type silicon.
References
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Quantum Spin Hall Insulator State in HgTe Quantum Wells
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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.