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It is shown that single-peaked collisionless current sheets in a Harris-typeequilibrium spontaneously bifurcate as a result of chaotic scattering ofelectrons at fluctuating magnetic fields near the center of the sheet, asdemonstrated by a 2D kinetic particle-in-cell simulation. For this effect to besimulated explicit particle advancing is necessary, since the details of theelectron motion have to be resolved. Unlike previous investigations oftriggering bifurcated current sheet (BCS) where initial perturbations orexternal pressure was applied the bifurcation is spontaneous if thermal noiseis taken into account. A spontaneous current sheet bifurcation develops quickerthan a tearing mode or other plasma instabilities. It is shown that in thecourse of the current sheet bifurcation the Helmholtz free energy decreaseswhile the entropy increases, i.e. the new, bifurcated current sheet is in amore propable state than the single-peaked one.

Spontaneous Bifurcation of Single Peaked Current Sheets by Chaotic Electron Scattering