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
Citations
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Linear magnetoresistance in topological insulator thin films: Quantum phase coherence effects at high temperatures
TL;DR: In this paper, it was shown that the high-field magnetoresistance of Bi2Te2Se is linear in field at low temperatures and low magnetic fields, and the slope of this linear-like MR is nearly independent of temperature over the range T = 7 to 150 K.
Journal ArticleDOI
Uncover Topology by Quantum Quench Dynamics.
Wei Sun,Chang-Rui Yi,Bao-Zong Wang,Wei-Wei Zhang,Barry C. Sanders,Barry C. Sanders,Barry C. Sanders,Xiao-Tian Xu,Z. M. Wang,Joerg Schmiedmayer,Youjin Deng,Xiong-Jun Liu,Shuai Chen,Jian-Wei Pan +13 more
TL;DR: In this article, a new dynamical approach for ultracold-atom systems to uncover their band topology is presented, and the authors provide solid evidence to demonstrate its experimental advantages.
Journal ArticleDOI
Gate-controlled surface conduction in Na-doped Bi2Te3 topological insulator nanoplates.
Yong Wang,Yong Wang,Yong Wang,Faxian Xiu,Lina Cheng,Liang He,Murong Lang,Jianshi Tang,Xufeng Kou,Xinxin Yu,Xiaowei Jiang,Zhigang Chen,Jin Zou,Kang L. Wang +13 more
TL;DR: Gate-tunable surface conduction in Na-doped Bi(2)Te(3) topological insulator nanoplates is reported, and by applying external gate voltages, suchTopological insulators can be tuned from p-type to n-type, rendering a promise in finding novel topology insulators with enhanced surface states.
Journal ArticleDOI
Epitaxial growth of Bi2Se3 topological insulator thin films on Si (111)
Liang He,Faxian Xiu,Yong Wang,Alexei V. Fedorov,G. Huang,Xufeng Kou,Murong Lang,Ward P. Beyermann,Jin Zou,Kang L. Wang +9 more
TL;DR: In this article, the epitaxial growth of Bi2Se3 thin films on Si (111) substrate, using molecular beam epitaxy (MBE), has been reported, and the as-grown samples have good crystalline quality, and their surfaces exhibit terracelike quintuple layers.
Journal ArticleDOI
Surface states and Rashba-type spin polarization in antiferromagnetic MnBi2Te4 (0001)
Raphael C. Vidal,Hendrik Bentmann,Thiago R. F. Peixoto,Alexander Zeugner,Simon Moser,Chul-Hee Min,S. Schatz,K. Kißner,M. Ünzelmann,Celso I. Fornari,Hari Babu Vasili,Manuel Valvidares,Kazuyuki Sakamoto,Debashis Mondal,Jun Fujii,Ivana Vobornik,Sungwon Jung,Cephise Cacho,Timur K. Kim,Roland J. Koch,Chris Jozwiak,Aaron Bostwick,J. D. Denlinger,E. Rotenberg,Jens Buck,Moritz Hoesch,Fritz Diekmann,Sebastian Rohlf,M. Kalläne,Kai Rossnagel,Mikhail M. Otrokov,Evgueni V. Chulkov,Michael Ruck,Anna Isaeva,Friedrich Reinert +34 more
TL;DR: In this paper, the authors acknowledge financial support from the DFG through SFB1170, Tocotronics, SPP 1666, ERA-Chemistry Programm (RU-776/15-1), and the Wurzburg-Dresden Cluster of Excellence on Complexity and Topology in Quantum Matter.
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.