Direct observation of Tomonaga-Luttinger-liquid state in carbon nanotubes at low temperatures

Article Abstract:

Metallic single-walled carbon nanotubes (SWNTs) are considered to be ideal one-dimensional systems for realizing Tomonaga-Luttinger-liquid (TLL) states. Angle-integrated photoemission measurements of SWNTs are reported. Results revealed an oscillation in the pie-electron density of states owing to one-dimensional van Hove singularities, confirming the one-dimensional nature of the valence band.

Free electron theory of metals, Fermi liquid

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Experimental observation of symmetry-breaking nonlinear modes in an active ring

Article Abstract:

Modes consisting of one or several solitons rotate around the ring, the topology of which imposes additional constraints on their allowed frequencies and phases. The mode spectrum of spin-wave solitons is measured in a nonlinear active ring constructed from a magnetic ferrite film.

Technology application, Wave propagation, Solitons

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Observation of rare-earth segregation in silicon nitride ceramics at subnanometre dimensions

Article Abstract:

The principles of micrometre-scale structural design are used to improve the mechanical properties of ceramics, which represents a step towards the atomic-level structural engineering. The direct images of dopant atoms (La) within the nanometre-scale are shown.

United States, Pottery, Ceramics, and Plumbing Fixture Manufacturing, Pottery and Related Products, Silicon Nitride Ceramics

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