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Flux Ropes as Singularities of the Vector Potential

Autor: Kleman, M

A flux rope is a domain of concentration of the magnetic field $\textbf{B}$. Insofar as $\textbf{B}$ outside such a domain is considered as vanishingly small, a flux rope can be described as the core of a singularity of the outer vector potential $\t

Externí odkaz: http://arxiv.org/abs/1402.2640

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Imperfections in focal conic domains: the role of dislocations

Autor: Kleman, M., Meyer, C., Nastishin, Yu. A.

It is usual to think of Focal Conic Domains (FCD) as perfect geometric constructions in which the layers are folded into Dupin cyclides, about an ellipse and a hyperbola that are conjugate. This ideal picture is often far from reality. We have invest

Externí odkaz: http://arxiv.org/abs/cond-mat/0507024

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Helical Ribbons as Isometric Textures

Autor: Achard, M. -F., Kleman, M., Nastishin, Yu. A., Nguyen, H. -T.

Deformations that conserve the parallelism and the distances --between layers, in smectic phases; between columns, in columnar phases-- are commonplace in liquid crystals. The resulting deformed textures have the same mass density as in the ground st

Externí odkaz: http://arxiv.org/abs/cond-mat/0403452

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Textural Analysis of a Mesophase with Banana Shaped Molecules

Autor: Nastishin, Yu. A., Achard, M. F., Nguyen, H. T., Kleman, M.

Observed under the polarizing microscope, the B7bis phase in the banana compound D14F3 [J.P. Bedel et al, Liq. Cryst., 27, 1411 (2000)] displays two types of textures of defects, namely (a): helical ribbons, that nucleate in large quantities when the

Externí odkaz: http://arxiv.org/abs/cond-mat/0310745

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