Magnetic-field dependence of energy levels in ultrasmall metal grains
S. Adam, M. L. Polianski, X. Waintal, P. W. Brouwer
Abstract
We present a theory of mesoscopic fluctuations of g tensors and avoided crossing energies in a small metal grain. The model, based on random matrix theory, contains both the orbital and spin contributions to the g tensor. The two contributions can be experimentally separated for weak spin-orbit coupling while they merge in the strong coupling limit. For intermediate coupling, substantial correlations are found between g factors of neighboring levels.
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