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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,…
Discovery of intrinsic ferromagnetism in two-dimensional van der Waals crystals
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.
A topological Dirac insulator in a quantum spin Hall phase
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.
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. Pauling…
Ultrahigh mobility and giant magnetoresistance in the Dirac semimetal Cd3As2.
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.
Large, non-saturating magnetoresistance in WTe2
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.
A tunable topological insulator in the spin helical Dirac transport regime
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.
Beyond Dirac and Weyl fermions: Unconventional quasiparticles in conventional crystals
The guiding principle of the classification is to find irreducible representations of the little group of lattice symmetries at high-symmetry points in the Brillouin zone for each of the 230 space groups (SGs), the dimension of which corresponds to the number of bands that meet at the high-Symmetry point.
Experimental realization of a three-dimensional Dirac semimetal.
- S. Borisenko, Q. Gibson, D. Evtushinsky, V. Zabolotnyy, B. Büchner, R. Cava
- PhysicsPhysical review letters
- 30 September 2013
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.
Quantum Oscillations and Hall Anomaly of Surface States in the Topological Insulator Bi2Te3
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.