Open AccessJournal Article
High-Temperature Majorana Corner States
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TLDR
In this article, the emergence of one Majorana Kramers pair at each corner of a square-shaped 2D topological insulator proximitized by an s-±}-wave (e.g., Fe-based) superconductor was shown.Abstract:
Majorana bound states often occur at the end of a 1D topological superconductor. Validated by a new bulk invariant and an intuitive edge argument, we show the emergence of one Majorana Kramers pair at each corner of a square-shaped 2D topological insulator proximitized by an s_{±}-wave (e.g., Fe-based) superconductor. We obtain a phase diagram that addresses the relaxation of crystal symmetry and edge orientation. We propose two experimental realizations in candidate materials. Our scheme offers a higher-order and higher-temperature route for exploring non-Abelian quasiparticles.read more
Citations
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Observation of Majorana fermions in ferromagnetic atomic chains on a superconductor
TL;DR: High-resolution spectroscopic imaging techniques show that the onset of superconductivity, which gaps the electronic density of states in the bulk of the Fe chains, is accompanied by the appearance of zero-energy end-states, providing strong evidence for the formation of a topological phase and edge-bound Majorana fermions in atomic chains.
Majorana Fermion Induced Resonant Andreev Reflection
TL;DR: In this article, the authors describe experimental signatures of Majorana fermion edge states, which form at the interface between a superconductor and the surface of a topological insulator.
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Observation of topological superconductivity on the surface of iron-based superconductor
Peng Zhang,Koichiro Yaji,Takahiro Hashimoto,Yuichi Ota,Takeshi Kondo,Kozo Okazaki,Zhijun Wang,Jinsheng Wen,Genda Gu,Hong Ding,Shik Shin +10 more
TL;DR: In this paper, the surface of the iron-based superconductor FeTe0.55Se0.45 has been shown to be topologically superconducting, providing a simple and possibly high-temperature platform for realizing Majorana states.
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(d - 2)-dimensional edge states of rotation symmetry protected topological states
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TL;DR: Theoretically, topological insulators are topological topologists that are insulating in their interior and on their surfaces but have conducting channels at corners or along edges as discussed by the authors.
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Topological crystalline insulators from crystal field effect in monolayer IV-VI semiconductors
TL;DR: In this article, it was shown that (001) monolayers of rocksalt IV-VI semiconductors XY (X=Ge, Sn, Pb and Y= S, Se, Te) are 2D topological crystalline insulators with the fundamental band gap as large as 260 meV in monolayer PbTe, providing a materials platform for realizing two-dimensional Dirac fermion systems with tunable band gap.
References
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Journal ArticleDOI
Colloquium: Topological insulators
M. Z. Hasan,Charles L. Kane +1 more
TL;DR: In this paper, the theoretical foundation for topological insulators and superconductors is reviewed and recent experiments are described in which the signatures of topologically insulators have been observed.
Journal ArticleDOI
Topological insulators and superconductors
Xiao-Liang Qi,Shou-Cheng Zhang +1 more
TL;DR: Topological superconductors are new states of quantum matter which cannot be adiabatically connected to conventional insulators and semiconductors and are characterized by a full insulating gap in the bulk and gapless edge or surface states which are protected by time reversal symmetry.
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.
Journal ArticleDOI
Topological insulators with inversion symmetry
Liang Fu,Charles L. Kane +1 more
TL;DR: In this paper, it was shown that the parity of the occupied Bloch wave functions at the time-reversal invariant points in the Brillouin zone greatly simplifies the problem of evaluating the topological invariants.
Journal ArticleDOI
Signatures of Majorana Fermions in Hybrid Superconductor-Semiconductor Nanowire Devices
Vincent Mourik,K. Zuo,Sergey Frolov,Sebastien Plissard,Epam Erik Bakkers,Epam Erik Bakkers,Leo P. Kouwenhoven +6 more
TL;DR: Electrical measurements on indium antimonide nanowires contacted with one normal (gold) and one superconducting (niobium titanium nitride) electrode support the hypothesis of Majorana fermions in Nanowires coupled to superconductors.