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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All-fiberized, passively Q-switched 1.06 μm laser using a bulk-structured Bi2Te3 topological insulator
TL;DR: In this paper, the use of a bulk-structured Bi2Te3 topological insulator (TI) deposited on a side-polished fiber as an effective saturable absorber for the implementation of an all-fiberized passively Q-switched 1.06 μm fiber laser was demonstrated.
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Effects of stoichiometry on structural, morphological and nanomechanical properties of bi2 se3 thin films deposited on inp(111) substrates by pulsed laser deposition
Yeong-Maw Hwang,Cheng-Tang Pan,Bo Syun Chen,Phuoc Huu Le,Ngo Ngoc Uyen,Le Thi Cam Tuyen,Vanthan Nguyen,Chih-Wei Luo,Jenh-Yih Juang,Jihperng Leu,Sheng Rui Jian,Sheng Rui Jian +11 more
TL;DR: In this paper, the structural, morphological, compositional, nanomechanical, and surface wetting properties of Bi2Se3 thin films prepared using a stoichiometric Bi 2Se3 target and a Se-rich target are investigated.
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Maximizing the thermoelectric performance of topological insulator Bi2Te3 films in the few-quintuple layer regime
TL;DR: Using first-principles calculations and the Boltzmann theory, the feasibility to maximize the thermoelectric figure of merit (ZT) of topological insulator Bi2Te3 films in the few-quintuple layer regime is explored and the appealing potential of bridging the long-standing ZT asymmetry is revealed.
Journal ArticleDOI
Half-Heusler topological insulators
Binghai Yan,Anne de Visser +1 more
TL;DR: In this article, an effective model Hamiltonian from which the topological state of half-Heusler compounds can be derived, notably from a non-trivial inverted band structure.
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Thermoelectric performance of classical topological insulator nanowires
Johannes Gooth,J.G. Gluschke,J.G. Gluschke,Robert Zierold,Martin Leijnse,Heiner Linke,Kornelius Nielsch +6 more
TL;DR: In this paper, the authors calculate the TE performance of TI nanowires based on Bi2Te3, Sb2Te-3 and Bi2Se3 as a function of diameter and Fermi level.
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.