L. Andrew Wray

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Recent discovery of spin-polarized single-Dirac-cone insulators, whose variants can host magnetism and superconductivity, has generated widespread research activity in condensed-matter and materials-physics communities. Some of the most interesting topological phenomena, however, require topological insulators to be placed in multiply connected, highly(More)
The recently discovered three-dimensional or bulk topological insulators are expected to exhibit exotic quantum phenomena. It is believed that a trivial insulator can be twisted into a topological state by modulating the spin-orbit interaction or the crystal lattice, driving the system through a topological quantum phase transition. By directly measuring(More)
The development of ferromagnetism in Mn-doped Bi2Te3 is characterized through measurements on a series of single crystals with different Mn content. Scanning tunneling microscopy analysis shows that the Mn substitutes on the Bi sites, forming compounds of the type Bi2−xMnxTe3, and that the Mn substitutions are randomly distributed, not clustered. Mn doping(More)
We investigate several strong spin-orbit coupling ternary chalcogenides related to the (Pb,Sn)Te series of compounds. Our first-principles calculations predict the low-temperature rhombohedral ordered phase in TlBiTe₂, TlBiSe₂, and TlSbX₂ (X=Te, Se, S) to be topologically nontrivial. We identify the specific surface termination that realizes the single(More)
A novel air-stable sodium iron hexacyanoferrate (R-Na1.92Fe[Fe(CN)6]) with rhombohedral structure is demonstrated to be a scalable, low-cost cathode material for sodium-ion batteries exhibiting high capacity, long cycle life, and good rate capability. The cycling mechanism of the iron redox is clarified and understood through synchrotron-based soft X-ray(More)
L. Andrew Wray, 2 Suyang Xu, Yuqi Xia, Alexei V. Fedorov, David Hsieh, Hsin Lin, Arun Bansil, Yew San Hor, Robert J. Cava, and M. Zahid Hasan Department of Physics, Joseph Henry Laboratories, Princeton University, Princeton, NJ 08544, USA Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94305, USA Department of Mathematics,(More)
In Fig. 2a and d of this Article, a uniform background subtraction was applied to the ARPES low-energy electronic structure measurements. In Fig. 2d, this background subtraction unintentionally was only applied to the central part of the figure. This affected the noise in the background but not the meaningful signal data features discussed in the paper, and(More)
We have investigated the interactions of UVI with two bacterial phosphate-containing species: Gram-positive Bacillus sphaericus and Gram-negative Pseudomonas aeruginosa. The Gram-positive B. sphaericus was investigated by using Raman spectroscopy and time-resolved laser-induced fluorescence spectroscopy (TRLFS). We found that living cells, spores, and(More)
Department of Physics, New York University, New York, NY, USA, 2 Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA, USA, Department of Condensed Matter Physics and Materials Science, Brookhaven National Laboratory, Upton, NY, USA, Comprehensive Research Organization for Science and Society, Ibaraki, Japan, 5 SPring-8, Japan Atomic(More)
A topological insulator protected by time-reversal symmetry is realized via spin-orbit interaction-driven band inversion. The topological phase in the Bi(1-x)Sb(x) system is due to an odd number of band inversions. A related spin-orbit system, the Pb(1-x)Sn(x)Te, has long been known to contain an even number of inversions based on band theory. Here we(More)