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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One-Dimensional Helical Transport in Topological Insulator Nanowire Interferometers
TL;DR: The observation of a topologically protected 1D mode of surface electrons in topological insulator nanowires existing at only two values of half magnetic quantum flux due to a spin Berry's phase is reported.
Journal ArticleDOI
Long range intrinsic ferromagnetism in two dimensional materials and dissipationless future technologies
Babar Shabbir,Babar Shabbir,Muhammad Nadeem,Muhammad Nadeem,Zhigao Dai,Michael S. Fuhrer,Qi Kun Xue,Xiaolin Wang,Qiaoliang Bao +8 more
TL;DR: In this article, the authors review recent progress in two-dimensional ferromagnetism in detail and predict new possible 2D ferromagnetic materials, and discuss the prospects for applications of atomically thin ferromagnets in novel dissipationless electronics, spintronics, and other conventional magnetic technologies.
Journal ArticleDOI
Magnetic Doping and Kondo Effect in Bi2Se3 Nanoribbons
Judy J. Cha,James R. Williams,Desheng Kong,Stefan Meister,Hailin Peng,Andrew Bestwick,Patrick Gallagher,David Goldhaber-Gordon,Yi Cui +8 more
TL;DR: In this article, the authors present synthesis of magnetically-doped Bi2Se3 nanoribbons by vapor-liquid solid growth using magnetic metal thin films as catalysts.
Journal ArticleDOI
Dirac mass generation from crystal symmetry breaking on the surfaces of topological crystalline insulators
Ilija Zeljkovic,Yoshinori Okada,Yoshinori Okada,Maksym Serbyn,Maksym Serbyn,Raman Sankar,Raman Sankar,Daniel Walkup,Wenwen Zhou,Junwei Liu,Guoqing Chang,Yung Jui Wang,M. Zahid Hasan,Fangcheng Chou,Hsin Lin,Arun Bansil,Liang Fu,Vidya Madhavan,Vidya Madhavan +18 more
TL;DR: In this article, the authors show that symmetry-breaking distortion on the surface of topological crystalline insulators imparts mass to Dirac electrons and that the mass depends on the penetration depth of the surface states.
Journal ArticleDOI
Evolution of the fermi surface of a doped topological insulator with carrier concentration
E. Lahoud,Eran Maniv,M. Shaviv Petrushevsky,Muntaser Naamneh,Amit Ribak,Steffen Wiedmann,Luca Petaccia,Zaher Salman,K. B. Chashka,Yoram Dagan,Amit Kanigel +10 more
TL;DR: In this paper, a combination of techniques that are sensitive to the shape of the Fermi surface (FS): the Shubnikov-de Haas effect and angle-resolved photoemission spectroscopy was used to study the evolution of the FS shape with carrier concentration, and they found that as $n$ increases, the FS becomes two-dimensional like.
References
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