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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Z2Pack: Numerical Implementation of Hybrid Wannier Centers for Identifying Topological Materials
Dominik Gresch,Gabriel Autès,Oleg V. Yazyev,Matthias Troyer,David Vanderbilt,B. Andrei Bernevig,Alexey A. Soluyanov,Alexey A. Soluyanov +7 more
TL;DR: The Z2Pack software package as mentioned in this paper is suitable for high-throughput screening of materials databases for compounds with nontrivial topologies, which can be used to identify topological materials optimal for experimental probes.
Journal ArticleDOI
Topological insulator nanowires and nanoribbons.
Desheng Kong,Jason C. Randel,Hailin Peng,Judy J. Cha,Stefan Meister,Keji Lai,Yulin Chen,Zhi-Xun Shen,Hari C. Manoharan,Yi Cui +9 more
TL;DR: In this paper, the authors report the synthesis and characterization of high quality single crystalline Bi(2)Se(3) nanomaterials with a variety of morphologies, including quasi-one-dimensional, sheetlike, zigzag and sawtooth shapes.
Journal ArticleDOI
Rapid surface oxidation as a source of surface degradation factor for Bi₂Se₃.
Desheng Kong,Judy J. Cha,Keji Lai,Hailin Peng,James Analytis,James Analytis,Stefan Meister,Yulin Chen,Yulin Chen,Haijun Zhang,Ian R. Fisher,Ian R. Fisher,Zhi-Xun Shen,Zhi-Xun Shen,Yi Cui +14 more
TL;DR: In this paper, transport measurements on Bi(2)Se(3) nanoribbons provide additional evidence of such environmental doping process, which is likely the material origin of the degradation of topological SS.
Journal ArticleDOI
Chiral anomaly and transport in Weyl metals.
TL;DR: The AHE in a Weyl metal is shown to be a purely intrinsic, universal property, fully determined by the location of the Weyl nodes in the first Brillouin zone, and a fully microscopic theory of diffusive magnetotransport in Weyl metals is developed.
Journal ArticleDOI
Thickness-dependent bulk properties and weak antilocalization effect in topological insulator Bi 2 Se 3
Yong Seung Kim,Yong Seung Kim,Matthew Brahlek,Namrata Bansal,Eliav Edrey,Gary A. Kapilevich,K. Iida,Makoto Tanimura,Yoichi Horibe,Sang-Wook Cheong,Seongshik Oh +10 more
TL;DR: In this article, a number of transport properties in topological insulator (TI) Bi{}_{2}$Se${}_{3}$ exhibit striking thickness dependences over a range of up to five orders of thickness (3 nm--170 \ensuremath{\mu}m).
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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.