Phase transitions and finite-size scaling
[Pages:23]Phase transitions and finite-size scaling
? Critical slowing down and "cluster methods". ? Theory of phase transitions/ "Renormalization Group" ? Finite-size scaling
Detailed treatment: "Lectures on Phase Transitions and the Renormalization Group" Nigel Goldenfeld (UIUC).
Atomic Scale Simulation
1
The Ising Model
? Suppose we have a lattice, with L2 lattice sites and connections between them. (e.g. a square lattice).
? On each lattice site, is a single spin
variable: si = ?1. ? With mag. field h, energy is:
N
H = - hs - Js s
i
ij
i=1
(i, j)
? J is the coupling between
Z = e-H
nearest neighbors (i,j)
si = ?1
? J>0 ferromagnetic
? J ................
................
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