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Titolo:
MOMENTUM DISTRIBUTION OF LIQUID-HELIUM
Autore:
MORONI S; SENATORE G; FANTONI S;
Indirizzi:
INT CTR THEORET PHYS,POB 586 I-34014 TRIESTE ITALY UNIV TRIESTE,IST NAZL FIS MAT I-34014 TRIESTE ITALY UNIV TRIESTE,DIPARTIMENTO FIS TEOR I-34014 TRIESTE ITALY SCUOLA INT SUPER STUDI AVANZATI,INTERDISCIPLINARY LAB I-34014 TRIESTEITALY
Titolo Testata:
Physical review. B, Condensed matter
fascicolo: 2, volume: 55, anno: 1997,
pagine: 1040 - 1049
SICI:
0163-1829(1997)55:2<1040:MDOL>2.0.ZU;2-B
Fonte:
ISI
Lingua:
ENG
Soggetto:
QUANTUM MONTE-CARLO; 2-DIMENSIONAL ELECTRON-GAS; BODY DENSITY-MATRIX; 3-BODY CORRELATIONS; CONDENSATE FRACTION; NUCLEAR-MATTER; WAVE-FUNCTIONS; GROUND-STATE; HE-4; OPTIMIZATION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
49
Recensione:
Indirizzi per estratti:
Citazione:
S. Moroni et al., "MOMENTUM DISTRIBUTION OF LIQUID-HELIUM", Physical review. B, Condensed matter, 55(2), 1997, pp. 1040-1049

Abstract

We have obtained the one-body density matrix and the momentum distribution n(p) of liquid He-4 at T = 0 K from diffusion Monte Carlo (DMC) simulations, using trial functions optimized via the Euler Monte Carlo(EMC) method. We find a condensate fraction smaller than in previous calculations. Though we do not explicitly include long-range correlations in our calculations, we obtain a momentum distribution at long wavelength which is compatible with the presence of long-range correlations in the exact wave function. We have also studied He-3, using fixed-node DMC, with nodes and trial functions provided by the EMC. In particular, we analyze the momentum distribution n(p) with respect to the discontinuity Z as well as the singular behavior at the Fermi surface. We also show that an approximate factorization of the one-body densitymatrix rho(r) similar or equal to rho(0)(r)rho(B)(r) holds, with rho(0)(r) and rho(B)(r), respectively, the density matrix of the ideal Fermi gas and the density matrix of a Bose He-3.

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Documento generato il 25/11/20 alle ore 17:47:34