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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Low carrier concentration crystals of the topological insulator Bi2−xSbxTe3−ySey: a magnetotransport study
Yu Pan,D. Wu,D. Wu,J. R. Angevaare,H. Luigjes,Emmanouil Frantzeskakis,N. de Jong,E. van Heumen,T. V. Bay,B. Zwartsenberg,Yingkai Huang,M. Snelder,Alexander Brinkman,Mark S. Golden,A. de Visser +14 more
TL;DR: Ren et al. as discussed by the authors presented a study to further refine the bulk-insulating properties of the material system (Bi,Sb)2(Te,Se)3 (BSTS) with compositions around x = 0.5 and y = 1.3.
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First-principles calculation of Z(2) topological invariants within the FP-LAPW formalism
TL;DR: This work provides an accurate and effective implementation of first-principles calculations of Z(2) topological invariants within the full-potential linearized augmented plane-wave (FP-LAPW) formalism to speed up the search of new topological insulators.
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Molecular beam epitaxy and characterization of thin Bi2Se3 films on Al2O3 (110)
TL;DR: The structural and electronic properties of thin Bi2Se3 films grown on Al2O3 (110) by molecular beam epitaxy are investigated in this paper, where the epitaxial films grow in the Frank-van der Merwe mode and are c-axis oriented.
Journal ArticleDOI
Identification of helicity-dependent photocurrents from topological surface states in Bi2Se3 gated by ionic liquid.
Junxi Duan,Ning Tang,Xin He,Yuan Yan,Shan Zhang,Xudong Qin,Xinqiang Wang,Xuelin Yang,Fujun Xu,Yonghai Chen,Weikun Ge,Bo Shen +11 more
TL;DR: By measuring the tunable helicity-dependent photocurrent (HDP), this work presents an identification of the HDP from the Dirac-like surface states at room temperature, and indicates that the surface band bending and resulted surface accumulation are successfully modulated by the applied ionic liquid gate.
Journal ArticleDOI
Experimental Determination of the Topological Phase Diagram in Cerium Monopnictides.
Kenta Kuroda,Masayuki Ochi,Hideyuki Suzuki,Hideyuki Suzuki,Motoaki Hirayama,M. Nakayama,Ryo Noguchi,Cédric Bareille,S. Akebi,So Kunisada,Takayuki Muro,Matthew D. Watson,Hideaki Kitazawa,Yoshinori Haga,Timur K. Kim,Moritz Hoesch,Shik Shin,Ryotaro Arita,Takeshi Kondo +18 more
TL;DR: This work investigates the bulk electronic structures of the series materials, Ce monopnictides, and unambiguously reveals the topological phase transition from a trivial to a nontrivial regime in going from CeP to CeBi induced by the band inversion.
References
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Superconducting Proximity Effect and Majorana Fermions at the Surface of a Topological Insulator
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