2.2. Multiple couplings Consider the one-dimensional Ising model with N spins i =1, with the Hamiltonian given
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2.2. Multiple couplings Consider the one-dimensional Ising model with N spins σi =±1, with the Hamiltonian given by H = −J1 N−1
i=1
σi σi+1 −J2 N−2
i=1
σiσi+2 Compute the free energy of such a system and analyse its behaviour by varying the parameters J1 and J2.
Hint. It is convenient to define τi = σiσi+1 that assume values τi =±1.
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Statistical Field Theory An Introduction To Exactly Solved Models In Statistical Physics
ISBN: 9780198788102
2nd Edition
Authors: Giuseppe Mussardo
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