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Titolo: Ground state properties of disordered and dimerized spin chains
Autore: Schuster, C; Eckern, U;
- Indirizzi:
- Univ Augsburg, Inst Phys, D-86135 Augsburg, Germany Univ Augsburg Augsburg Germany D-86135 t Phys, D-86135 Augsburg, Germany
- Titolo Testata:
- ANNALEN DER PHYSIK
fascicolo: 7-9,
volume: 8,
anno: 1999,
pagine: 585 - 588
- Fonte:
- ISI
- Lingua:
- ENG
- Keywords:
- quantum spin systems; quantum coherence; disordered systems;
- Tipo documento:
- Article
- Natura:
- Periodico
- Settore Disciplinare:
- Physical, Chemical & Earth Sciences
- Citazioni:
- 8
- Recensione:
- Indirizzi per estratti:
- Indirizzo: Schuster, C Univ Augsburg, Inst Phys, D-86135 Augsburg, Germany Univ Augsburg Augsburg Germany D-86135 135 Augsburg, Germany
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- Citazione:
- C. Schuster e U. Eckern, "Ground state properties of disordered and dimerized spin chains", ANN PHYSIK, 8(7-9), 1999, pp. 585-588
Abstract
Concerning the question of the (spin-)Peierls mechanism in the presence ofdisorder we present a detailed analysis of the ground state phase diagram of the dimerized anisotropic Heisenberg-XXZ chain containing one impurity. It is obtained by studying the destruction of the quantum coherence by the perturbations. The stability of the Peierls phase, i.e. the occurence of a stable dimerization, is determined by the energy gain and gap due to the coupling to the static phonons. The extension of the paramagnetic phase, found already in the clean dimerized chain, grows by adding the impurity, because the distortions weaken each other. The Peierls phase is reduced for two reasons: First, the energy gain of the spin-system decreases, which leads to a smaller stable dimerization and second, the energy gap itself is reduced.
ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 25/05/13 alle ore 05:05:48