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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Spectroscopic evidence for the realization of a genuine topological nodal-line semimetal in LaSbTe
Yang Wang,Yuting Qian,Meng Yang,Hongxiang Chen,Hongxiang Chen,Cong Li,Zhiyun Tan,Yongqing Cai,Wenjuan Zhao,Shunye Gao,Ya Feng,Shiv Kumar,Eike F. Schwier,Eike F. Schwier,Lin Zhao,Hongming Weng,Youguo Shi,Gang Wang,Youting Song,Yaobo Huang,Kenya Shimada,Zuyan Xu,Xingjiang Zhou,Guodong Liu +23 more
TL;DR: In this article, direct evidence for the realization of a genuine nodal-line semimetal in LaSbTe was provided by performing band structure calculations and angle-resolved photoemission measurements.
Journal Article
Room temperature quantum spin Hall states in two-dimensional crystals composed of pentagonal rings and their quantum wells
TL;DR: In this paper, the authors predicted a family of large-gap QSH insulators in SnX2 (X=S, Se, or Te) two-dimensional (2D) crystals by direct calculation of Z2 topological invariants and edge states.
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Diffusion at the surface of topological insulators
TL;DR: In this article, the authors consider the dc transport properties of topological insulator surface states in the presence of uncorrelated point-like disorder, both in the classical and quantum regimes.
Journal ArticleDOI
The electronic structure of clean and adsorbate-covered Bi2Se3: an angle-resolved photoemission study
Marco Bianchi,Richard C. Hatch,Dandan Guan,Tilo Planke,Jianli Mi,Bo B. Iversen,Philip Hofmann +6 more
TL;DR: In this paper, angle-resolved photoelectron spectroscopy is used for a detailed study of the electronic structure of the topological insulator Bi2Se3, where the pristine surface shows the topology surface state in the bulk band gap.
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Proximity Effect Induced Electronic Properties of Graphene on Bi2Te2Se
Paengro Lee,Kyung-Hwan Jin,Si Jin Sung,Jin Gul Kim,Mintae Ryu,Heemin Park,Seung-Hoon Jhi,Nam Dong Kim,Yongsam Kim,Seong Uk Yu,Kwang S. Kim,Do Young Noh,Jinwook Chung +12 more
TL;DR: It is reported that the π-electrons of graphene can be spin-polarized to create a phase with a significant spin-orbit gap at the Dirac point (DP) using a graphene-interfaced topological insulator hybrid material.
References
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