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Titolo:
Quantum n-vector anharmonic crystal II: Displacement fluctuations
Autore:
Angelescu, N; Verbeure, A; Zagrebnov, VA;
Indirizzi:
Inst Atom Phys, Dept Theoret Phys, R-76900 Bucharest, Romania Inst Atom Phys Bucharest Romania R-76900 hys, R-76900 Bucharest, Romania Katholieke Univ Leuven, Inst Theoret Fys, B-3001 Heverlee, Belgium Katholieke Univ Leuven Heverlee Belgium B-3001 B-3001 Heverlee, Belgium Univ Mediterranee, F-13248 Marseille, France Univ Mediterranee MarseilleFrance F-13248 ee, F-13248 Marseille, France Ctr Phys Theor, F-13248 Marseille 9, France Ctr Phys Theor Marseille France 9 hys Theor, F-13248 Marseille 9, France
Titolo Testata:
JOURNAL OF STATISTICAL PHYSICS
fascicolo: 5-6, volume: 100, anno: 2000,
pagine: 829 - 851
SICI:
0022-4715(200009)100:5-6<829:QNACID>2.0.ZU;2-W
Fonte:
ISI
Lingua:
ENG
Soggetto:
PHASE-TRANSITIONS; MODEL;
Keywords:
quantum anharmonic crystal; large n-limit; large-distance correlations; fluctuations;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
11
Recensione:
Indirizzi per estratti:
Indirizzo: Angelescu, N Inst Atom Phys, Dept Theoret Phys, POB Mg-6, R-76900 Bucharest, Romania Inst Atom Phys POB Mg-6 Bucharest Romania R-76900 t, Romania
Citazione:
N. Angelescu et al., "Quantum n-vector anharmonic crystal II: Displacement fluctuations", J STAT PHYS, 100(5-6), 2000, pp. 829-851

Abstract

Based on the l/n-expansion derived in a previous paper, the displacement fluctuations are analyzed in a quantum n-vector model of anharmonic crystal in the large n regime. It is shown that in the ferroelectric phase the n --> infinity; limit of the local fluctuation field has faster large-distance correlation decay than its Hartree-Fock approximation. Also, the critical exponent of the global displacement fluctuation is strictly smaller there than the Hartree-Fock exponent. In particular, the displacement fluctuations may be normal in the ferroelectric phase in spite of the Hartree Fock prediction.

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Documento generato il 04/12/20 alle ore 19:56:08