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
Reads0
Chats0
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
More filters
Journal ArticleDOI
Topological phases in two-dimensional materials: a review.
Yafei Ren,Zhenhua Qiao,Qian Niu +2 more
TL;DR: In this article, the authors mainly focus on recent progress in the engineering of topologically nontrivial phases (such as topological insulators, quantum anomalous Hall effects, quantum valley Hall effects etc) in two-dimensional systems.
Observation of Fermi Arc Surface States in a Topological Metal: A New Type of 2D Electron Gas
Su-Yang Xu,Chang Liu,Satya Kushwaha,Raman Sankar,Jason W. Krizan,I. Belopolski,Madhab Neupane,Guang Bian,N. Alidoust,H.-T. Jeng,Cheng-Yi Huang,Wei-Feng Tsai,Hsin Lin,F. C. Chou,Pavel Shibayev,Robert J. Cava,M. Zahid Hasan +16 more
TL;DR: The systematic results collectively identify a topological phase in a gapless material and observe a pair of spin-polarized Fermi arc surface states on the surface of the Dirac semimetal Na3Bi at its native chemical potential.
Journal ArticleDOI
Intrinsic Topological Insulator Bi2Te3 Thin Films on Si and Their Thickness Limit
Yaoyi Li,Guang Wang,Xie-Gang Zhu,Minhao Liu,Cun Ye,Xi Chen,Yayu Wang,Ke He,Lili Wang,Xucun Ma,Haijun Zhang,Xi Dai,Zhong Fang,Xincheng Xie,Ying Liu,Xiao-Liang Qi,Jin-Feng Jia,Shou-Cheng Zhang,Qi-Kun Xue,Qi-Kun Xue +19 more
TL;DR: In situ angle-resolved photo-emission spectroscopy measurement reveals that the as-grown Bi2Te3 films are intrinsic topological insulators and the single-Dirac-cone surface state develops at a thickness of two quintuple layers.
Journal ArticleDOI
Landau Quantization of Topological Surface States in Bi2Se3
Peng Cheng,Can-Li Song,Tong Zhang,Tong Zhang,Yanyi Zhang,Yilin Wang,Jin-Feng Jia,Jing Wang,Yayu Wang,Bang-Fen Zhu,Xi Chen,Xucun Ma,Ke He,Lili Wang,Xi Dai,Zhong Fang,Xincheng Xie,Xiao-Liang Qi,Xiao-Liang Qi,Chao-Xing Liu,Chao-Xing Liu,Shou-Cheng Zhang,Qi-Kun Xue,Qi-Kun Xue +23 more
TL;DR: The zeroth Landau level is discovered, predicted to give rise to the half-quantized Hall effect for the topological surface states, which may eventually lead to the realization of quantum Hall effect in topological insulators.
Journal ArticleDOI
Hedgehog spin texture and Berry's phase tuning in a magnetic topological insulator
Su-Yang Xu,Madhab Neupane,Chang Liu,Duming Zhang,A. Richardella,L. Andrew Wray,L. Andrew Wray,Nasser Alidoust,M. Leandersson,Thiagarajan Balasubramanian,Jaime Sánchez-Barriga,Oliver Rader,Gabriel Landolt,Gabriel Landolt,Bartosz Slomski,Bartosz Slomski,Jan Hugo Dil,Jan Hugo Dil,Jürg Osterwalder,Tay-Rong Chang,Horng-Tay Jeng,Horng-Tay Jeng,Hsin Lin,Arun Bansil,Nitin Samarth,M. Zahid Hasan +25 more
TL;DR: In this article, the authors demonstrate magnetically induced spin reorientation phenomena simultaneous with a Dirac-metal to gapped-insulator transition on the surfaces of manganese-doped Bi2Se3 thin films.
References
More filters
Journal ArticleDOI
Generalized Gradient Approximation Made Simple
TL;DR: A simple derivation of a simple GGA is presented, in which all parameters (other than those in LSD) are fundamental constants, and only general features of the detailed construction underlying the Perdew-Wang 1991 (PW91) GGA are invoked.
Journal ArticleDOI
The rise of graphene
TL;DR: Owing to its unusual electronic spectrum, graphene has led to the emergence of a new paradigm of 'relativistic' condensed-matter physics, where quantum relativistic phenomena can now be mimicked and tested in table-top experiments.
Journal ArticleDOI
Quantum Spin Hall Insulator State in HgTe Quantum Wells
Markus König,Steffen Wiedmann,Steffen Wiedmann,Christoph Brüne,Christoph Brüne,Andreas Roth,Andreas Roth,Hartmut Buhmann,Hartmut Buhmann,Laurens W. Molenkamp,Laurens W. Molenkamp,Xiao-Liang Qi,Xiao-Liang Qi,Shou-Cheng Zhang,Shou-Cheng Zhang +14 more
TL;DR: The quantum phase transition at the critical thickness, d = 6.3 nanometers, was independently determined from the magnetic field–induced insulator-to-metal transition, providing experimental evidence of the quantum spin Hall effect.
Journal ArticleDOI
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.