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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Solution-based synthesis of anisotropic metal chalcogenide nanocrystals and their applications
TL;DR: In this paper, a review of recent advances in solution phase synthesis to generate 1-D and 2-D anisotropic metal chalcogenide (MC) nanostructures with a focus on using different growth mechanisms to control the shapes of the MCs.
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Decorated ultrathin bismuth selenide nanosheets as targeted theranostic agents for in vivo imaging guided cancer radiation therapy
TL;DR: A nanomaterial that enhances the targeted destruction of cancer cells by radiotherapy has been demonstrated by scientists in China and shows excellent ability to target cancer cells and has a potent radiosensitization efficiency with high stability.
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Projective ribbon permutation statistics: A remnant of non-Abelian braiding in higher dimensions
Michael H. Freedman,Matthew B. Hastings,Chetan Nayak,Xiao-Liang Qi,Xiao-Liang Qi,Kevin Walker,Zhenghan Wang +6 more
TL;DR: In this article, the authors analyzed the topology of the space of configurations of 2n defects in a slowly spatially varying gapped free-fermion Hamiltonian and showed that these defects realize projective ribbon permutation statistics.
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Surface versus bulk state in topological insulator Bi2Se3 under environmental disorder
TL;DR: In this paper, the surface and bulk states of Bi2Se3 thin films were investigated under environmental disorder and it was shown that the bulk states are sensitive to environmental disorder but the surface states remain robust.
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Growth, Structure, and Electronic Properties of Epitaxial Bismuth Telluride Topological Insulator Films on BaF2 (111) Substrates
Ondřej Caha,Adam Dubroka,Josef Humlíček,Václav Holý,H. Steiner,M. Ul-Hassan,Jaime Sánchez-Barriga,Oliver Rader,T. N. Stanislavchuk,Andrei Sirenko,Gerrit E. W. Bauer,G. Springholz +11 more
TL;DR: In this article, the growth of topological insulator bismuth telluride by molecular beam epitaxy onto BaF2 (111) substrates is studied using Bi2Te3 and Te as source materials.
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.