Recent content by Krischi

Really, a 4\times4 matrix? If there are 4 base states, why can't I use a 2\times2 matrix? 4 states fit into a 2\times2 matrix, right? I tried this and calculated 2 eigenvalues, \lambda, but I am not sure, if the result is correct, since it "looks" to complicated (see my 1st reply)

Homework Statement Consider two Ising spins coupled together −βH = h(σ1 + σ2) + Kσ1σ2, where σ1 and σ2 commute and each independently takes on the values ±1. What are the eigenvalues of this Hamiltonian? What are the degeneracies of the states? The Attempt at a Solution Four possible...