Is Heisenberg model or in its simplier form Ising model a good approximation to study magnetic systems?
What measured quantity can be associated to the value of the J parameter in the Heisenberg/Ising hamiltonians?
What are the physical consequences of adding a constant to the diagonal of the effective Hamiltonian of monolayer materials?
Are there interesting applications of estimating the energy for generalizations of the Heisenberg model?
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