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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,Expand
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. Expand
Ultrahigh mobility and giant magnetoresistance in the Dirac semimetal Cd3As2.
TLDR
This work reports a property of Cd3As2 that was unpredicted, namely a remarkable protection mechanism that strongly suppresses backscattering in zero magnetic field and discusses how this may relate to changes to the Fermi surface induced by the applied magnetic field. Expand
Zero-point entropy in ‘spin ice’
Common water ice (ice Ih) is an unusual solid—the oxygen atoms form a periodic structure but the hydrogen atoms are highly disordered due to there being two inequivalent O–H bond lengths. PaulingExpand
Discovery of intrinsic ferromagnetism in two-dimensional van der Waals crystals
TLDR
It is concluded that Cr2Ge2Te6 is a nearly ideal two-dimensional Heisenberg ferromagnet and so will be useful for studying fundamental spin behaviours, opening the door to exploring new applications such as ultra-compact spintronics. Expand
Large, non-saturating magnetoresistance in WTe2
TLDR
The observation of an extremely large positive magnetoresistance at low temperatures in the non-magnetic layered transition-metal dichalcogenide WTe2 is reported, which will represent a significant new direction in the study of magnetoresistivity. Expand
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. Expand
Experimental realization of a three-dimensional Dirac semimetal.
TLDR
The direct observation of the three-dimensional (3D) Dirac semimetal phase in cadmium arsenide by means of angle-resolved photoemission spectroscopy is reported, and it is proved the existence of the long sought 3D Dirac points. Expand
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. Expand
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. Expand
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