Physics – Condensed Matter – Statistical Mechanics
Scientific paper
2008-06-05
Phys. Rev. B 79, 144420 (2009) [5 pages]
Physics
Condensed Matter
Statistical Mechanics
4 pages, 5 figures. We improved text and included a predicted noise curve in Figure 4. 2 examples from Figure 3 are removed
Scientific paper
10.1103/PhysRevB.79.144420
We provide a general scheme to predict and derive the contribution to the noise spectrum of a stochastic sequence of pulses from the distribution of pulse parameters. An example is the magnetization noise spectra of a 2D Ising system near its phase transition. At $T\le T_c$, the low frequency spectra is dominated by magnetization flips of nearly the entire system. We find that both the predicted and the analytically derived spectra fit those produced from simulations. Subtracting this contribution leaves the high frequency spectra which follow a power law set by the critical exponents.
Chen Zhi
Yu Clare C.
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