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
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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Topology on a new facet of bismuth.
Chuang-Han Hsu,Xiaoting Zhou,Tay-Rong Chang,Qiong Ma,Nuh Gedik,Arun Bansil,Su-Yang Xu,Hsin Lin,Liang Fu +8 more
TL;DR: In this paper, it was shown that bismuth is a first-order topological crystalline insulator with a two-fold rotational symmetry, and that its surface exhibits a pair of gapless Dirac surface states, which are not restricted to locate at specific k points in the Brillouin zone.
Journal ArticleDOI
Ultrafast electron dynamics at the Dirac node of the topological insulator Sb2Te3
Siyuan Zhu,Yukiaki Ishida,Kenta Kuroda,Kazuki Sumida,Mao Ye,Jiajia Wang,Hong Pan,Masaki Taniguchi,Shan Qiao,Shan Qiao,Shik Shin,Akio Kimura +11 more
TL;DR: This work explores the surface Dirac fermion dynamics in the TI Sb2Te3 by time- and angle-resolved photoemission spectroscopy (TrARPES) and finds an in-gap DP located completely above the Fermi energy (EF).
Journal ArticleDOI
Relativistic quantum chaos
TL;DR: Relativistic Quantum Quantum Chaos (RQC) as mentioned in this paper is a new field in quantum physics, which aims to uncover, understand, and exploit relativistic quantum manifestations of classical nonlinear dynamical behaviors including chaos.
Journal ArticleDOI
One-dimensional weak antilocalization in single-crystal Bi2Te3 nanowires.
Wei Ning,Wei Ning,Haifeng Du,Haifeng Du,Fengyu Kong,Fengyu Kong,Jiyong Yang,Jiyong Yang,Yuyan Han,Yuyan Han,Mingliang Tian,Mingliang Tian,Mingliang Tian,Yuheng Zhang,Yuheng Zhang +14 more
TL;DR: The magnetoconductance of Bi2Te3 single-crystal nanowires in low field regime can be well described by one-dimensional (1D) weak antilocalization (WAL) model, where the dephasing length of the electrons follows T−1/3 dependence but insensitive to the wire diameter.
Journal ArticleDOI
Computation and data driven discovery of topological phononic materials
TL;DR: This work substantially increases the amount of TP materials, which enables an in-depth investigation of their structure-property relations and opens new avenues for future device design related to TPs.
References
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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.