Orbital and spin contributions to the $g$-tensors in metal nanoparticles

Details Orbital and spin contributions to the $g$-tensors in metal nanoparticles Orbital and spin contributions to the $g$-tensors in metal nanoparticles

2003-12-11

arxiv.org/abs/cond-mat/0312278v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

21 pages, 6 figures; accepted for publication in Physical Review B

Scientific paper

10.1103/PhysRevB.69.045411

We present a theoretical study of the mesoscopic fluctuations of $g$-tensors in a metal nanoparticle. The calculations were performed using a semi-realistic tight-binding model, which contains both spin and orbital contributions to the $g$-tensors. The results depend on the product of the spin-orbit scattering time $\tau_{\textrm{\small so}}$ and the mean-level spacing $\delta$, but are otherwise weakly affected by the specific shape of a {\it generic} nanoparticle. We find that the spin contribution to the $g$-tensors agrees with Random Matrix Theory (RMT) predictions. On the other hand, in the strong spin-orbit coupling limit $\delta \tau_{\textrm{\small so}}/\hbar \to 0$, the orbital contribution depends crucially on the space character of the quasi-particle wavefunctions: it levels off at a small value for states of $d$ character but is strongly enhanced for states of $sp$ character. Our numerical results demonstrate that when orbital coupling to the field is included, RMT predictions overestimate the typical $g$-factor of orbitals that have dominant $d$-character. This finding points to a possible source of the puzzling discrepancy between theory and experiment.

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