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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Recent Progress in Proximity Coupling of Magnetism to Topological Insulators.
Semonti Bhattacharyya,Golrokh Akhgar,Matthew Gebert,Julie Karel,Julie Karel,Mark T. Edmonds,Michael S. Fuhrer +6 more
TL;DR: This review focuses on one strategy: inducing magnetic order in topological insulators by proximity of magnetic materials, which has the capability for room temperature operation, unlocking the potential of magnetic topological phases for applications.
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Mode of Growth of Ultrathin Topological Insulator Bi2Te3 Films on Si (111) Substrates
TL;DR: In this article, the growth of Bi2Te3 ultrathin films on Si (111) substrates using molecular beam epitaxy was studied in detail by in situ scanning tunnelling microscopy and high-resolution scanning transmission electron microscopy.
Journal ArticleDOI
Symmetries, Dimensions, and Topological Insulators: the mechanism behind the face of the Bott clock
TL;DR: In this article, the Atiyah, Bott, Shapiro construction is applied to understand the twisted bundles of electron bands that underly the properties of topological insulators, spin Hall systems, and other topologically interesting materials.
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Topological proximity effect in a topological insulator hybrid
T. Shoman,Akari Takayama,Takafumi Sato,Seigo Souma,Takashi Takahashi,Tamio Oguchi,Kouji Segawa,Yoichi Ando +7 more
TL;DR: It is shown that a migration of the topological state occurs as a result of strong spin-dependent hybridization of the wave functions at the interface, which is supported by first-principles calculations.
Posted Content
Tunable Dirac Fermion Dynamics in Topological Insulators
Chaoyu Chen,Zhuojin Xie,Ya Feng,Hemian Yi,Aiji Liang,Shaolong He,Daixiang Mou,Junfeng He,Yingying Peng,Xu Liu,Yan Liu,Lin Zhao,Guodong Liu,Xiaoli Dong,Jun Zhang,Li Yu,Xiaoyang Wang,Qinjun Peng,Zhimin Wang,Shenjin Zhang,Feng Yang,Chuangtian Chen,Zuyan Xu,Xingjiang Zhou +23 more
TL;DR: In this paper, the electron-phonon coupling in Bi2(Te,Se)3 topological insulators has been investigated and it is shown that electron-disorder interaction is the dominant factor in the scattering process.
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.