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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Stabilized Li3N for efficient battery cathode prelithiation
TL;DR: Li3N can deliver more than 10 times the theoretical capacity of existing cathode materials and can serve as an excellent cathode prelithiation additive to offset the initial lithium loss in lithium-ion batteries.
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Classification of topological insulators and superconductors in the presence of reflection symmetry
TL;DR: In this paper, a topological classification of insulators and superconductors in the presence of both (nonspatial) discrete symmetries in the Altland-Zirnbauer classification and spatial reflection symmetry in any spatial dimensions is discussed.
Journal ArticleDOI
Crossover of the three-dimensional topological insulator Bi2Se3 to the two-dimensional limit
Yi Zhang,Ke He,Cui-Zu Chang,Cui-Zu Chang,Can-Li Song,Lili Wang,Xi Chen,Jin-Feng Jia,Zhong Fang,Xi Dai,Wen-Yu Shan,Shun-Qing Shen,Qian Niu,Xiao-Liang Qi,Shou-Cheng Zhang,Xucun Ma,Qi-Kun Xue +16 more
TL;DR: In this paper, an angle-resolved photoemission spectroscopy was performed on Bi2Se3 films of various thicknesses grown by molecular beam epitaxy and the energy gap opening was clearly seen when the thickness is below six quintuple layers.
Journal ArticleDOI
Pressure-induced superconductivity in topological parent compound Bi2Te3
Ju-Yuan Zhang,Shuai Zhang,Hongming Weng,Wei Zhang,L. X. Yang,Qiufeng Liu,S. M. Feng,Xing Wang,Rong Yu,L. Z. Cao,Lin Wang,Wenge Yang,H. Z. Liu,W. Y. Zhao,Shou-Cheng Zhang,Xi Dai,Zhong Fang,Changqing Jin +17 more
TL;DR: The results suggested that topological superconductivity can be realized in Bi2Te3 due to the proximity effect between superconducting bulk states and Dirac-type surface states.
Broadband Photodetectors Based on GrapheneBi 2 Te 3 Heterostructure
Hong Qiao,Zai-Quan Xu,Caiyun Chen,Shenghuang Lin,Jingchao Song,Yan Liu,Qasim Khan,Hui Ying Hoh,Chun-Xu Pan,Shaojuan Li,Qiaoliang Bao +10 more
TL;DR: The results show that the graphene-Bi2Te3 photodetector has much higher photoresponsivity (35 AW(-1) at a wavelength of 532 nm) and higher sensitivity (photoconductive gain up to 83), as compared to the pure monolayer graphene-based devices.
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.