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Atom-specific spin mapping and buried topological states in a homologous series of topological insulators
Strategies to tune the surface properties of topological insulators are essential, if they are to find use in applications. Using a combination of theoretical and experimental techniques, this study examines how the properties of ordered ternary topological insulators vary with the content of group IV elements.
- Sergey V. Eremeev
- , Gabriel Landolt
- & Evgueni V. Chulkov
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Chemical structures of hydrazine-treated graphene oxide and generation of aromatic nitrogen doping
Parket al. use 13C and 15N solid-state NMR and X-ray photoelectron spectroscopy to study the chemical structure of hydrazine-treated graphite oxide. Hydrazine treatment is shown to lead to the incorporation of aromatic N2moieties at the graphene edges and restore graphitic networks on the basal planes.
- Sungjin Park
- , Yichen Hu
- & Rodney S. Ruoff
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Band structure engineering in (Bi1−xSbx)2Te3 ternary topological insulators
The unique band structure of topological insulators gives rise to insulating bulk and unusual metallic surface properties. By tuning the content of Sb in the ternary compound (Bi1–xSbx)2Te3, Wang and collaborators show it is possible to control the precise features of the band structure in a continuous fashion.
- Jinsong Zhang
- , Cui-Zu Chang
- & Yayu Wang
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Charge density waves in the graphene sheets of the superconductor CaC6
Charge density waves in the structure and electron density of layered materials are closely linked to superconductivity. Using scanning tunnelling techniques, Rahnejatet al. demonstrate the occurrence of such waves in the doped graphene sheets of the superconductor CaC6.
- K.C. Rahnejat
- , C.A. Howard
- & M. Ellerby
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Imaging local electronic corrugations and doped regions in graphene
The unoccupied electronic levels of graphene are modified by corrugation, doping and presence of impurities. Here, the authors map discrete electronic domains within a single graphene sheet using scanning transmission X-ray microscopy and provide insight into the modification of unoccupied levels.
- Brian J. Schultz
- , Christopher J. Patridge
- & Sarbajit Banerjee
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| Open AccessDimensionality-driven insulator–metal transition in A-site excess non-stoichiometric perovskites
Many technological applications would benefit from new ways of bringing complex materials near the insulator–metal transition region. The authors induce, in a Lantanum Strontium Titanate, a transition from insulating to metallic behaviour by structural intercalation of intrinsically insulating units, opening new avenues to engineer these materials.
- Zhongchang Wang
- , Masaki Okude
- & Yuichi Ikuhara