Exact diagonalization of spin-1/2 trimers, star tetramers, and tetrahedra shows that Kitaev exchange creates nonlinear field-dependent energy levels, level repulsion, and a second heat-capacity Schottky anomaly at large K/J.
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Exact eigenvalues and experimental signatures of Heisenberg-Kitaev interactions in spin-1/2 quantum clusters
Exact diagonalization of spin-1/2 trimers, star tetramers, and tetrahedra shows that Kitaev exchange creates nonlinear field-dependent energy levels, level repulsion, and a second heat-capacity Schottky anomaly at large K/J.