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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Superconductivity of the topological insulator Bi2Se3 at high pressure
P. P. Kong,Ju-Yuan Zhang,S. J. Zhang,Juye Zhu,Q. Q. Liu,Rencheng Yu,Zhi-Peng Fang,Changqing Jin,Wenge Yang,Xiaohui Yu,Xiaohui Yu,Jinlong Zhu,Jinlong Zhu,Yusheng Zhao,Yusheng Zhao +14 more
TL;DR: The pressure-induced superconductivity and structural evolution of Bi2Se3 single crystals are studied and high-pressure synchrotron radiation measurements reveal structural transitions at around 12, 20, and above 29 GPa.
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Ultrafast carrier dynamics in thin-films of the topological insulator Bi2Se3
TL;DR: In this article, the authors showed that the carrier relaxation time of Bi2Se3 thin films shortens with decreasing film thickness, reaching values comparable to those of noble metals, which may result from the hybridization of Dirac cone states at the opposite surfaces for the thinnest films.
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Achieving Surface Quantum Oscillations in Topological Insulator Thin Films of Bi2Se3
TL;DR: The surface states of TIs are peculiar in that they are comprised of spin-fi ltered, massless Dirac fermions that hold promise for novel spintronics and topological quantum computations.
Journal ArticleDOI
Coherent Heteroepitaxy of Bi2Se3 on GaAs (111)B
Anthony Richardella,Duming Zhang,Joon Sue Lee,A. Koser,D. W. Rench,Andrew L. Yeats,Bob B. Buckley,David D. Awschalom,Nitin Samarth +8 more
TL;DR: In this article, the authors reported the heteroepitaxy of single crystal thin films of Bi2Se3 on the surface of GaAs by molecular beam epitaxy, and they showed that Bi 2Se3 grows highly c-axis oriented, with an atomically sharp interface with the GaAs substrate.
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Topological surface state enhanced photothermoelectric effect in Bi2Se3 nanoribbons.
Yuan Yan,Zhi-Min Liao,Xiaoxing Ke,Gustaaf Van Tendeloo,Qinsheng Wang,Dong Sun,Wei Yao,Shuyun Zhou,Lei Zhang,Han-Chun Wu,Han-Chun Wu,Dapeng Yu +11 more
TL;DR: The photothermoelectric effect in topological insulator Bi2Se3 nanoribbons is studied and is expected to have potential applications in a spin-polarized power source.
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.