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Orbital and spin contributions to the g tensors in metal nanoparticles

Cehovin, Aleksander LU ; Canali, Carlo LU and MacDonald, AH (2004) In Physical Review B (Condensed Matter and Materials Physics) 69(4).
Abstract
We present a theoretical study of the mesoscopic fluctuations of g tensors in a metal nanoparticle. The calculations were performed using a semirealistic tight-binding model, which contains both spin and orbital contribution to the g tensors. The results depend on the product of the spin-orbit scattering time tau(so) and the mean-level spacing delta, but are otherwise weakly affected by the specific shape of a 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 deltatau(so)/h-->0, the orbital contribution depends crucially on the space character of the quasiparticle wave functions: it levels off at a small... (More)
We present a theoretical study of the mesoscopic fluctuations of g tensors in a metal nanoparticle. The calculations were performed using a semirealistic tight-binding model, which contains both spin and orbital contribution to the g tensors. The results depend on the product of the spin-orbit scattering time tau(so) and the mean-level spacing delta, but are otherwise weakly affected by the specific shape of a 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 deltatau(so)/h-->0, the orbital contribution depends crucially on the space character of the quasiparticle wave functions: 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. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review B (Condensed Matter and Materials Physics)
volume
69
issue
4
publisher
American Physical Society
external identifiers
  • wos:000189075200082
  • scopus:1542313975
ISSN
1098-0121
DOI
10.1103/PhysRevB.69.045411
language
English
LU publication?
yes
id
bfcd066d-d3aa-4ee3-ba0a-c2587475fbf4 (old id 286954)
date added to LUP
2007-10-17 16:30:54
date last changed
2017-07-02 04:21:33
@article{bfcd066d-d3aa-4ee3-ba0a-c2587475fbf4,
  abstract     = {We present a theoretical study of the mesoscopic fluctuations of g tensors in a metal nanoparticle. The calculations were performed using a semirealistic tight-binding model, which contains both spin and orbital contribution to the g tensors. The results depend on the product of the spin-orbit scattering time tau(so) and the mean-level spacing delta, but are otherwise weakly affected by the specific shape of a 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 deltatau(so)/h-->0, the orbital contribution depends crucially on the space character of the quasiparticle wave functions: 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.},
  author       = {Cehovin, Aleksander and Canali, Carlo and MacDonald, AH},
  issn         = {1098-0121},
  language     = {eng},
  number       = {4},
  publisher    = {American Physical Society},
  series       = {Physical Review B (Condensed Matter and Materials Physics)},
  title        = {Orbital and spin contributions to the g tensors in metal nanoparticles},
  url          = {http://dx.doi.org/10.1103/PhysRevB.69.045411},
  volume       = {69},
  year         = {2004},
}