Orbital and spin contributions to the g tensors in metal nanoparticles
(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)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/286954
- author
- Cehovin, Aleksander LU ; Canali, Carlo LU and MacDonald, AH
- organization
- publishing date
- 2004
- 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
- 2016-04-01 16:10:54
- date last changed
- 2025-04-04 14:16:07
@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}},
doi = {{10.1103/PhysRevB.69.045411}},
volume = {{69}},
year = {{2004}},
}