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Observation of a large-gap topological-insulator class with a single Dirac cone on the surface
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,…
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A topological Dirac insulator in a quantum spin Hall phase
TLDR
The direct observation of massive Dirac particles in the bulk of Bi0.9Sb0.1 is reported, which suggests that the observed surface state on the boundary of the bulk insulator is a realization of the ‘topological metal’, which has potential application in developing next-generation quantum computing devices that may incorporate ‘light-like’ bulk carriers and spin-textured surface currents.
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A tunable topological insulator in the spin helical Dirac transport regime
TLDR
The results reveal a spin-momentum locked Dirac cone carrying a non-trivial Berry’s phase that is nearly 100 per cent spin-polarized, which exhibits a tunable topological fermion density in the vicinity of the Kramers point and can be driven to the long-sought topological spin transport regime.
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Superconductivity in CuxBi2Se3 and its implications for pairing in the undoped topological insulator.
TLDR
It is shown that copper intercalation in the van der Waals gaps between the Bi2Se3 layers, yielding an electron concentration of approximately 2x10{20} cm{-3}, results in superconductivity at 3.8 K in CuxBi2 Se3 for 0.12<or=x<or =0.15.
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Quantum Oscillations and Hall Anomaly of Surface States in the Topological Insulator Bi2Te3
TLDR
The observation of Shubnikov–de Haas oscillations arising from the surface states in nonmetallic crystals of Bi2Te3 are reported and a Hall anomaly in weak fields is uncovered, which enables the surface current to be seen directly and yield a surface mobility substantially higher than in the bulk.
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Topological surface states protected from backscattering by chiral spin texture
TLDR
It is demonstrated that the chiral nature of these states protects the spin of the carriers, potentially useful for spin-based electronics, in which long spin coherence is critical, and also for quantum computing applications, where topological protection can enable fault-tolerant information processing.
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Observation of time-reversal-protected single-dirac-cone topological-insulator states in Bi2Te3 and Sb2Te3.
TLDR
It is directly shown that Bi2Te3 is a large spin-orbit-induced indirect bulk band gap semiconductor whose surface is characterized by a single topological spin-Dirac cone, and it is demonstrated that the dynamics of spin- Dirac fermions can be controlled through systematic Mn doping.
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Extreme sensitivity of superconductivity to stoichiometry in Fe1+δSe
The recently discovered iron arsenide superconductors appear to display a universal set of characteristic features, including proximity to a magnetically ordered state and robustness of the…
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Development of Ferromagnetism in the Doped Topological Insulator Bi 2-x Mn x Te 3
The development of ferromagnetism in Mn-doped Bi_2Te_3 is characterized through measurements on a series of single crystals with different Mn content. Scanning tunneling microscopy analysis shows…
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Observation of topological order in a superconducting doped topological insulator
When doped with copper, the topological insulator Bi2Se3 becomes superconducting. But for new physics and applications the search is not for just any superconductor; the material must retain its…
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