Variational ground state for the periodic Anderson model

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American Institute of Physics


A variational calculation of the ground state of the Anderson lattice model is discussed. The calculation creates a finite Hamiltonian matrix for many_electron states, which are appropriate for the thermodynamic limit. A simple 14_14 truncation is discussed for finite U and a smaller 3_3 is used for the large U limit. Both approximations indicate that the spin configurations of the localized f orbitals are antiferromagnetically correlated for nearest neighbors in the ground state. This antiferromagnetic correlation is mediated by an RKKY interaction and thus offers a variety of spin orderings as a function of lattice and density.



Antiferromagnetism, Ground states


Bowen, S. P., Mancini, J. D. (1988). Variational ground state for the periodic Anderson model. Journal of Applied Physics, 63(8), 3402-3404. doi: 10.1063/1.340774