Driven and non-driven surface chaos in spin-glass sponges
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Date
2023
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Pergamon-elsevier Science Ltd
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Abstract
A spin-glass system with a smooth or fractal outer surface is studied by renormalization-group theory, in bulk spatial dimension d = 3. Independently varying the surface and bulk random-interaction strengths, phase diagrams are calculated. The smooth surface does not have spin-glass ordering in the absence of bulk spin-glass ordering and always has spin-glass ordering when the bulk is spin-glass ordered. With fractal (d > 2) surfaces, a sponge is obtained and has surface spin-glass ordering also in the absence of bulk spin-glass ordering. The phase diagram has the only-surface-spin-glass ordered phase, the bulk and surface spin-glass ordered phase, and the disordered phase, and a special multicritical point where these three phases meet. All spin-glass phases have distinct chaotic renormalization-group trajectories, with distinct Lyapunov and runaway exponents which we have calculated.
Description
Artun, Erbil Can/0000-0002-9624-3124; Berker, A/0000-0002-5172-2172
Keywords
Spin-glass chaos, Surface chaos, Spontaneous and driven chaos, Chaos on fractals, Lyapunov Exponents, Chaos multicritical point
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1
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Volume
176