Magnetosonic solitons in a Fermionic quantum plasma

Details Magnetosonic solitons in a Fermionic quantum plasma Magnetosonic solitons in a Fermionic quantum plasma

2007-04-16

arxiv.org/abs/0704.2049v2

Phys. Rev. E 76, 067401 (2007)

Physics

Plasma Physics

8 pages, 3 figures, version to appear in Physical Review E

Scientific paper

10.1103/PhysRevE.76.067401

Starting from the governing equations for a quantum magnetoplasma including the quantum Bohm potential and electron spin-1/2 effects, we show that the system of quantum magnetohydrodynamic (QMHD) equations admit rarefactive solitons due to the balance between nonlinearities and quantum diffraction/tunneling effects. It is found that the electron spin-1/2 effect introduces a pressure-like term with negative sign in the QMHD equations, which modifies the shape of the solitary magnetosonic waves and makes them wider and shallower. Numerical simulations of the time-dependent system shows the development of rarefactive QMHD solitary waves that are modified by the spin effects.

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