Naslov
Quantum Monte Carlo study of overpressurised liquid 4He at zero temperature

Autori
Vranješ Markić, Leandra ; Boronat, Jordi ; Cassuleras, Joaquim ; Cazorla, Claudio

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Izvornik
Series on Advances in Quantum Many-Body Theory / Hernández, Susana ; Cataldo, Horacio - Singapur : World Scientific Publishing, 2006, 190-199

Skup
13th International Conference on Recent Progress in Many-Body Theories QMBT13

Mjesto i datum
Buenos Aires, Argentina, 05.12.2005. - 09.12.2005

Vrsta sudjelovanja
Pozvano predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
he-4; excitations; superfluid helium; roton; Monte Carlo

Sažetak
We present a diffusion Monte Carlo simulation of metastable superfluid 4He at zero temperature and pressures beyond freezing (~ 25 bar) up to 275 bar. The equation of state of liquid 4He is extended to the overpressurized regime, where the pressure dependence of the static structure factor and the condensate fraction is obtained. Along this large pressure range, excited-state energy corresponding to the roton has been determined using the release-node technique. Our results show that both the roton energies and the condensate fraction decrease with increasing pressure but do not become zero. We compare our calculations to recent experimental data in overpressurized regime.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

POVEZANOST RADA