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 Properties and Functionalities in Oxide Thin Films and Interfaces
Masaki Uchida,Masashi Kawasaki +1 more
TL;DR: A review of the trends of new topological properties and functionalities in oxide materials with sorting out a number of examples can be found in this paper, where the authors also discuss the application of topology in the field of nanotechnology.
Journal ArticleDOI
A Natural Topological Insulator
Pascal Gehring,Hadj M. Benia,Ye Weng,Robert E. Dinnebier,Christian R. Ast,Marko Burghard,Klaus Kern,Klaus Kern +7 more
TL;DR: In this article, it was shown that Kawazulite, a mineral with the approximate composition Bi2(Te,Se)2(Se,S), represents a naturally occurring topological insulator whose electronic properties compete well with those of its synthetic counterparts.
Journal ArticleDOI
Nitric oxide ameliorates aluminium toxicity in Anabaena PCC 7120: Regulation of aluminium accumulation, exopolysaccharides secretion, photosynthesis and oxidative stress markers
TL;DR: Results clearly show that NO has a role in ameliorating Al stress in Anabaena PCC 7120 by regulating intracellular accumulation of Al, secretion of EPS, photosynthesis, oxidative stress markers and antioxidant defense system.
Journal ArticleDOI
Origin and evolution of surface spin current in topological insulators
André Dankert,Priyamvada Bhaskar,Dmitrii Khokhriakov,Isabel Harrysson Rodrigues,Bogdan Karpiak,M. Venkata Kamalakar,M. Venkata Kamalakar,Sophie Charpentier,Ion Garate,Saroj P. Dash +9 more
TL;DR: In this article, the authors demonstrate that the control over the bulk and surface contribution is crucial to maximize the charge-to-spin conversion efficiency in semiconducting Bi1.5Sb0.5Te1.7Se1.3 below 100K.
Journal ArticleDOI
Ternary compounds based on binary topological insulators as an efficient way for modifying the Dirac cone
Tatiana V. Menshchikova,Sergey V. Eremeev,Sergey V. Eremeev,Yuri M. Koroteev,V. M. Kuznetsov,Eugene V. Chulkov +5 more
TL;DR: In this article, the electronic structure of AIVBVI has been theoretically investigated and a similar atomic structure has been predicted for the YbBi(Sb)2Te4 compounds.
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.