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
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
Citations
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Surface spin-polarized currents generated in topological insulators by circularly polarized synchrotron radiation and their photoelectron spectroscopy indication
Alexander M. Shikin,I. I. Klimovskikh,M. V. Filyanina,A. A. Rybkina,D. A. Pudikov,Konstantin A. Kokh,Konstantin A. Kokh,Oleg E. Tereshchenko,Oleg E. Tereshchenko +8 more
TL;DR: In this article, the spin-dependent asymmetry of the generation of holes at the Fermi level for branches of topological surface states with the opposite spin orientation under the circularly polarized synchrotron radiation was investigated.
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Superconductivity in bulk polycrystalline metastable phases of Sb2Te3 and Bi2Te3 quenched after high-pressure–high-temperature treatment
Sergei G. Buga,V. A. Kulbachinskii,V. A. Kulbachinskii,V. A. Kulbachinskii,Vladimir G. Kytin,G. A. Kytin,Ivan A. Kruglov,N.A. Lvova,N. S. Perov,N. R. Serebryanaya,S. A. Tarelkin,Vladimir Blank +11 more
TL;DR: In this paper, the authors synthesized bulk polycrystalline samples of metastable phases of Sb2Te3 and Bi2Te-3 topological insulators by rapid quenching after a high-pressure-high-temperature treatment at P = 3.7-7.7
Journal ArticleDOI
Two-dimensional topological insulators and their edge states
TL;DR: In this paper, the basic properties of topological insulators are reviewed, and various properties of the edge states of the two-dimensional topology are described, and the edge properties are analyzed.
Journal ArticleDOI
Te-seeded growth of few-quintuple layer Bi2Te3 nanoplates
Yanyuan Zhao,Maria de la Mata,Richard L.J. Qiu,Jun Zhang,Xinglin Wen,César Magén,Xuan P. A. Gao,Jordi Arbiol,Jordi Arbiol,Qihua Xiong +9 more
TL;DR: In this paper, a Te-seeded epitaxial growth of ultrathin Bi2Te3 nanoplates (down to three quintuple layers (QL)) with large planar sizes up to tens of micrometers was reported.
Journal ArticleDOI
Transport across a junction of topological insulators and a superconductor
TL;DR: In this paper, the authors study transport across a line junction lying between two orthogonal topological insulator surfaces and a superconductor which can have either s-wave (spin-singlet) or p-wave pairing symmetry.
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.