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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Transport in three-dimensional topological insulators: Theory and experiment
Dimitrie Culcer,Dimitrie Culcer +1 more
TL;DR: In this article, a review of recent theoretical and experimental work on transport due to the surface states of three-dimensional topological insulators is presented, including Boltzmann transport, quantum corrections and weak localization, as well as longitudinal and Hall transport.
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High performance broadband photodetector using fabricated nanowires of bismuth selenide.
TL;DR: It is demonstrated that focused ion beam (FIB) fabricated nanowires of TIs could be used as ultrasensitive visible-NIR nanowire photodetector based on TIs.
Journal ArticleDOI
Graphene-Based Topological Insulator with an Intrinsic Bulk Band Gap above Room Temperature
Liangzhi Kou,Binghai Yan,Feiming Hu,Shu-Chun Wu,Tim O. Wehling,Claudia Felser,Changfeng Chen,Thomas Frauenheim +7 more
TL;DR: In this paper, a 2D topological insulator with a graphene layer sandwiched between two Bi2Se3 slabs is presented, which exhibits a large intrinsic bulk band gap of 30-50 meV.
Electrical Detection of Spin-Polarized Surface States Conduction in
Jianshi Tang,Li-Te Chang,Xufeng Kou,Koichi Murata,Eun Sang Choi,Murong Lang,Yabin Fan,Ying Jiang,Mohammad Montazeri,Wanjun Jiang,Yong Wang,Liang He,Kang L. Wang +12 more
TL;DR: In this article, the spin voltage amplitude was quantitatively analyzed to yield an effective spin polarization of 1.02% for the surface states conduction in (Bi0.53Sb0.47)2Te3.
Journal ArticleDOI
CO Oxidation Facilitated by Robust Surface States on Au-Covered Topological Insulators
TL;DR: It is demonstrated that the robust topological surface state(s) (TSS) on the three-dimensional topological insulators can significantly enhance the adsorption energy of both CO and O(2) molecules, by promoting different directions of static electron transfer.
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.