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 dangling bonds with large spin splitting and enhanced spin polarization on the surfaces of Bi2Se3.
Hsin Lin,Tanmoy Das,Yoshinori Okada,Yoshinori Okada,Yoshinori Okada,Michael Boyer,W. Doug Wise,Michelle Tomasik,Bo Zhen,Eric Hudson,Wenwen Zhou,Vidya Madhavan,Chung Yuan Ren,Chung Yuan Ren,Hiroshi Ikuta,Arun Bansil +15 more
TL;DR: In this article, the topological surface state properties at various surface cleaves in the Bi2Se3 topological insulator were investigated via first principles calculations and scanning tunneling microscopy/spectroscopic analysis.
Journal ArticleDOI
Generation, transport and detection of valley-locked spin photocurrent in WSe2-graphene-Bi2Se3 heterostructures.
Soonyoung Cha,Minji Noh,Jehyun Kim,Jangyup Son,Jangyup Son,Hyemin Bae,Doeon Lee,Doeon Lee,Hoil Kim,Jekwan Lee,Ho Seung Shin,Sangwan Sim,Seunghoon Yang,Sooun Lee,Wooyoung Shim,Chul-Ho Lee,Moon-Ho Jo,Jun Sung Kim,Dohun Kim,Hyunyong Choi +19 more
TL;DR: Lateral TMD–graphene–topological insulator hetero-devices enable room-temperature optoelectronic transport of the valley-lockedspin polarization degree of freedom and exhibit a non-local spin polarization degree higher than 0.5, providing the potential for coupled opto-spin–valleytronic applications that independently exploit the valley and spin DoFs.
Journal ArticleDOI
Electron transport properties of three-dimensional topological insulators
TL;DR: In this paper, the electron transport properties of topological insulator thin films are discussed in the context of weak antilocalization and electron-electron interactions, and the current status of gate-voltage control of the chemical potential in topology insulators is described.
Journal ArticleDOI
Multiple Coexisting Dirac Surface States in Three-Dimensional Topological Insulator PbBi6Te10
Marco Papagno,Sergey V. Eremeev,Sergey V. Eremeev,Jun Fujii,Ziya S. Aliev,Mahammad B. Babanly,Sanjoy K. Mahatha,Ivana Vobornik,Nazim Mamedov,Daniela Pacilé,Evgueni V. Chulkov +10 more
TL;DR: By means of angle-resolved photoemission spectroscopy (ARPES) measurements, the electronic band structure of three-dimensional PbBi6Te10 topological insulator is unveiled, displaying distinct electronic band dispersion, different constant energy contours, and Dirac point energies.
Journal ArticleDOI
Plasmonics in Topological Insulators
TL;DR: With strong spin-orbit coupling, topological insulators have an insulating bulk state, characterized by a band gap, and a conducting surface state, characterised by a Dirac cone as discussed by the authors.
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.