3,195 research outputs found
The edge engineering of topological Bi(111) bilayer
A topological insulator is a novel quantum state, characterized by
symmetry-protected non-trivial edge/surface states. Our first-principle
simulations show the significant effects of the chemical decoration on edge
states of topological Bi(111) bilayer nanoribbon, which remove the trivial edge
state and recover the Dirac linear dispersion of topological edge state. By
comparing the edge states with and without chemical decoration, the Bi(111)
bilayer nanoribbon offers a simple system for assessing conductance fluctuation
of edge states. The chemical decoration can also modify the penetration depth
and the spin texture of edge states. A low-energy effective model is proposed
to explain the distinctive spin texture of Bi(111) bilayer nanoribbon, which
breaks the spin-momentum orthogonality along the armchair edge.Comment: 5 pages, 5 figure
Ixeridium sagittarioides (Asteraceae-Cichorieae) revisited: range extension and molecular evidence for its systematic position in the Lactuca alliance
Our first record of the rare and scatteredly distributed Ixeridium sagittarioides for Guizhou, China, triggered a study to assess its systematic position. The species was placed in four different genera in the course of its taxonomic history and was recently treated with doubts as a member of Ixeridium in the Flora of China. Comparative morphological investigation and phylogenetic analyses based on the nuclear ribosomal DNA internal transcribed spacer (nrITS) and five non-coding plastid DNA regions (petD region, psbA-trnH, trnL-trnF, rpl32-trnL (UAG) and 5´rps16-trnQ (UUG) spacers) provided evidence that the species is not a member of Ixeridium and the Crepidinae but has evolved by ancient hybridisation of members of the Lactuca alliance (Lactucinae). It is reinstated as Lactuca sagittarioides and a comprehensive morphological description is provided, based on material from its entire range of distribution
Scanning tunneling microscopy and spectroscopy of nanoscale twisted bilayer graphene
Nanoscale twisted bilayer graphene (TBG) is quite instable and will change
its structure to Bernal (or AB-stacking) bilayer with a much lower energy.
Therefore, the lack of nanoscale TBG makes its electronic properties not
accessible in experiment up to now. In this work, a special confined TBG is
obtained in the overlaid area of two continuous misoriented graphene sheets.
The width of the confined region of the TBG changes gradually from about 22 nm
to 0 nm. By using scanning tunnelling microscopy, we studied carefully the
structure and the electronic properties of the nanoscale TBG. Our results
indicate that the low-energy electronic properties, including twist-induced van
Hove singularities (VHSs) and spatial modulation of local density-of-state, are
strongly affected by the translational symmetry breaking of the nanoscale TBG.
Whereas, the electronic properties above the energy of the VHSs are almost not
influenced by the quantum confinement even when the width of the TBG is reduced
to only a single moire spot.Comment: 4 Figure
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