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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The physics of quantum materials
TL;DR: In this paper, a review of the electronic properties of quantum materials through the prism of the electron wavefunction is presented, and the authors examine how its entanglement and topology give rise to a rich variety of quantum states and phases.
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Crossover between Weak Antilocalization and Weak Localization in a Magnetically Doped Topological Insulator
Minhao Liu,Jinsong Zhang,Cui-Zu Chang,Cui-Zu Chang,Zuocheng Zhang,Xiao Feng,Kang Li,Ke He,Lili Wang,Xi Chen,Xi Dai,Zhong Fang,Qi-Kun Xue,Qi-Kun Xue,Xucun Ma,Yayu Wang +15 more
TL;DR: This work demonstrates an effective way to manipulate the quantum transport properties of the topological insulators by breaking time-reversal symmetry.
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Interface engineering of quantum Hall effects in digital transition metal oxide heterostructures
TL;DR: It is predicted that LaAuO(3) bilayers have a topologically non-trivial energy gap of about 0.15 eV, which is sufficiently large to realize the quantum spin Hall effect at room temperature.
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First-principles studies of the three-dimensional strong topological insulators Bi2Te3, Bi2Se3 and Sb2Te3
TL;DR: In this paper, the penetration depth and the spin-resolved Fermi surfaces of the surface states of Bi2Se3, Bi2Te3 and Sb2Te-3 compounds are analyzed.
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Effective continuous model for surface states and thin films of three-dimensional topological insulators
TL;DR: In this paper, Zhang et al. derived two-dimensional (2D) effective continuous models for the surface states and thin films of a 3D topological insulator (3DTI) based on first-principles calculations.
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.