Letters

Figure 3 AFM characterization of triangular DNA nanotubes. a, The construction of DNA nanotubes 3nt from triangle 3' results in well-defined one-dimensional DNA assemblies that extend over several micrometres, which from cross-sectional analysis (lower half of figure) are shown to be of the same diameter. Scale bar, 2.5 mm. b, Hairpins incorporated into the corner units of each triangular rung 3'-hp using rigidifying strands RS-hp assemble into triangular DNA nanotubes 3nt-hp with radially...

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Thermomechanical Graphs

Department of Electrical Engineering, Yale University, New Haven, Connecticut 06511, USA. *e-mail hong.tang yale.edu Figure 1 End-to-end coupled waveguide nanocantilevers. a, Optical microscope image of the photonic circuitry, showing the nanomechanical cantilevers in the centre and the two grating couplers at the ends of the waveguides. b, SEM image of the end-to-end coupled waveguide nanocantilever devices. The inset shows how the ends of the nanocantilevers are offset by 25 nm in the...

Superconductivity

How thin can a film of lead be and still retain its ability to conduct electricity Previous experiments have shown that films with just five layers of lead atoms become superconducting when they are cooled below about 6 K. Now Chih-Kang Shih and co-workers at the University of Texas at Austin have shown that just two layers of lead atoms which contain just a single channel of quantum-well states can act as a superconductor Science doi 10.1126 science.1170775 2009 . Shih and co-workers found...

Scientific World Eugenie Samuel Reich

Plastic Fantastic How the Biggest Fraud in Physics shook the scientific world PALGRAVE MACMILLAN 2009. 272 PP. 15.00 26.95 HARDBACK Sometime in 1999, when I was editor of Physics World magazine, I commissioned Bertram Batlogg, then based at the world-famous Bell Laboratories in Murray Hill, New Jersey, to write an article on cuprate superconductors. As I recall, a first draft arrived a few months later, and I replied with some queries and suggestions. I also recall that it took much longer than...

June 2009 Vol 4 Issue

Quantum dots defined in carbon nanotubes are attractive for exploring a wide range of phenomena in fundamental physics. For some of these experiments it is necessary to confine a single electron in a quantum dot, while controlling the height of the barriers on either side of the dot, but this has proved difficult. Now, Gary Steele, Georg Gotz and Leo Kouwenhoven have confined a single electron in a tunable double quantum dot in a nanotube for the first time, and also observed a novel type of...

Dna Origami

Nano Lett. doi 10.1021 nl901165f 2009 Nature 459, 73-76 2009 DNA is a natural polymer with nanoscale geometry. It is comprises a backbone of repeated sugar-phosphate units, with one of the four bases adenine A , cytosine C , guanine G or thymine T attached to each sugar. The base-pairing rules A-T and C-G that form the double helix can also be exploited to build self-assembled nanostructures. One promising approach to DNA nanotechnology, introduced by Paul Rothemund in 2006, uses a lengthy...