| HAL : ensl-00368568, version 1 |
| arXiv : 0903.2916 |
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| On the thermodynamic limit of form factors in the massless XXZ Heisenberg chain |
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| N. Kitanine1Karol K. Kozlowski2Jean Michel Maillet2N. A. Slavnov3Véronique Terras2, 4 |
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| (17/03/2009) |
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| We consider the problem of computing form factors of the massless XXZ Heisenberg spin-1/2 chain in a magnetic field in the (thermodynamic) limit where the size M of the chain becomes large. For that purpose, we take the particular example of the matrix element of the third component of spin between the ground state and an excited state with one particle and one hole located at the opposite ends of the Fermi interval (umklapp-type term). We exhibit its power-law decrease in terms of the size of the chain M , and compute the corresponding exponent and amplitude. As a consequence, we show that this form factor is directly related to the amplitude of the leading oscillating term in the long-distance asymptotic expansion of the two-point correlation function of the third component of spin. |
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| Domaine | : | Physique/Physique des Hautes Energies - Théorie Physique/Physique mathématique Mathématiques/Physique mathématique Physique/Matière Condensée/Mécanique statistique |
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| Quantum integrable models – spin chain – form factors – correlation functions – asymptotic analysis |
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| Liste des fichiers attachés à ce document : | ||||||||||
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| ensl-00368568, version 1 | |
| http://hal-ens-lyon.archives-ouvertes.fr/ensl-00368568 | |
| oai:hal-ens-lyon.archives-ouvertes.fr:ensl-00368568 | |
| Contributeur : Jean Michel Maillet | |
| Soumis le : Mardi 17 Mars 2009, 00:06:23 | |
| Dernière modification le : Vendredi 25 Septembre 2009, 08:42:03 | |