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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:
-
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- 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