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The European Physical Journal B
ISSN: 1434-6028 (printed version)
ISSN: 1434-6036 (electronic version)
Abstract Volume 3 Issue 2 (1998) pp 149-154
Optical conductivity of the Bechgaard salts: the sum rules revisited
V. Vescoli (1), J. Favand (2), F. Mila (2), L. Degiorgi (1) (a)
(1) Laboratorium für Festkörperphysik, ETH-Zürich, 8093 Zürich, Switzerland
(2) Laboratoire de Physique Quantique, Université Paul Sabatier, 31062 Toulouse, France
Received: 19 December 1997 / Received in final form: 9 March 1998 / Accepted: 23 March 1998
Abstract: The validity of the optical sum rules has been addressed eversince and was always matter of debate. Particularly controversial is the proof that the partial sum rules can be extended to both optical conductivity and energy loss function. We show in this paper that for both transverse (optical conductivity) and longitudinal (energy loss function) absorption processes the corresponding sum rule can be theoretically established and through appropriate conditions for the integration limits exactly verified. We also focus our attention on the one-dimensional case within the microscopic Hubbard model. An application of these concepts to the quasi one-dimensional systems, for which we have chosen the organic (TMTSF)2PF6 material, will also be presented.
PACS. 78.20.-e Optical properties of bulk materials and thin films - 75.30.Fv Spin-density waves
(a) email: degiorgi@solid.phys.ethz.ch
Article in PDF-Format (301 KB)
Online publication: July 9, 1998
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