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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A weak topological insulator state in quasi-one-dimensional bismuth iodide.
Ryo Noguchi,Takanari Takahashi,Kenta Kuroda,Masayuki Ochi,Tetsuroh Shirasawa,M. Sakano,Cédric Bareille,M. Nakayama,Matthew Watson,Koichiro Yaji,Ayumi Harasawa,Hideaki Iwasawa,Pavel Dudin,Timur K. Kim,Moritz Hoesch,Viktor Kandyba,Alessio Giampietri,Alexei Barinov,Shik Shin,Ryotaro Arita,Takao Sasagawa,Takeshi Kondo +21 more
TL;DR: In this paper, a quasi-one-dimensional Dirac topological surface state at the side surface of a bismuth iodide, β-Bi4I4, was found.
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Mode-locked ytterbium-doped fiber laser based on topological insulator: Bi_2Se_3
TL;DR: An all-normal-dispersion Yb-doped mode-locked fiber laser based on Bi₂Se₃ topological insulator has an attractive optoelectronic property at 1μm waveband and can operate in multiple pulse state that six-pulse regime can be realized.
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Thermoelectric transport in perfectly conducting channels in quantum spin Hall systems
TL;DR: In this article, the authors studied the thermoelectric transport of two-dimensional quantum spin Hall systems in narrow ribbon geometry and found that at high temperature electrons in the bulk states dominate.
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Broadband ultrafast spatial self-phase modulation for topological insulator Bi2Te3 dispersions
TL;DR: In this article, the authors showed that the coherent light scattering is due to the broadband, ultrafast, and large third-order optical nonlinearity of Ultrathin topological insulator bismuth telluride (Bi2Te3) nanosheets with uniform hexagonal nanostructure.
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Coordination Programming of Two-Dimensional Metal Complex Frameworks.
TL;DR: An overview of recent progress in synthesizing CONASHs and in elucidating their intriguing electrical, sensing, and catalytic properties is provided.
References
More filters
Journal ArticleDOI
Generalized Gradient Approximation Made Simple
TL;DR: A simple derivation of a simple GGA is presented, in which all parameters (other than those in LSD) are fundamental constants, and only general features of the detailed construction underlying the Perdew-Wang 1991 (PW91) GGA are invoked.
Journal ArticleDOI
The rise of graphene
TL;DR: Owing to its unusual electronic spectrum, graphene has led to the emergence of a new paradigm of 'relativistic' condensed-matter physics, where quantum relativistic phenomena can now be mimicked and tested in table-top experiments.
Journal ArticleDOI
Quantum Spin Hall Insulator State in HgTe Quantum Wells
Markus König,Steffen Wiedmann,Steffen Wiedmann,Christoph Brüne,Christoph Brüne,Andreas Roth,Andreas Roth,Hartmut Buhmann,Hartmut Buhmann,Laurens W. Molenkamp,Laurens W. Molenkamp,Xiao-Liang Qi,Xiao-Liang Qi,Shou-Cheng Zhang,Shou-Cheng Zhang +14 more
TL;DR: The quantum phase transition at the critical thickness, d = 6.3 nanometers, was independently determined from the magnetic field–induced insulator-to-metal transition, providing experimental evidence of the quantum spin Hall effect.
Journal ArticleDOI
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.