Naslov
Free expansion of a Lieb-Liniger gas : Asymptotic form of the wave functions

Autori
Jukić, Dario ; Pezer, Robert ; Gasenzer, Thomas ; Buljan, Hrvoje

Izvornik
Physical Review A (1050-2947) 78 (2008), 5; 053602-1

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Lieb-Liniger gas; nonequilibrium dynamics; free expansion

Sažetak
The asymptotic form of the wave functions describing a freely expanding Lieb-Liniger gas is derived by using a Fermi-Bose transformation for time-dependent states, and the stationary phase approximation. We find that asymptotically the wave functions approach the Tonks-Girardeau (TG) structure as they vanish when any two of the particle coordinates coincide. We point out that the properties of these asymptotic states can significantly differ from the properties of a TG gas in a ground state of an external potential. The dependence of the asymptotic wave function on the initial state is discussed. The analysis encompasses a large class of initial conditions, including the ground states of a Lieb-Liniger gas in physically realistic external potentials. It is also demonstrated that the interaction energy asymptotically decays as a universal power law with time, E_int ~ t^{; ; ; − 3}; ; ; .

Izvorni jezik
Engleski

Znanstvena područja
Fizika

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