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Tunneling theory for tunable open quantum systems of ultracold atoms in one-dimensional traps

Rikard Lundmark (Institutionen för fundamental fysik) ; Christian Forssén (Institutionen för fundamental fysik) ; Jimmy Rotureau (Institutionen för fundamental fysik)
Physical Review A (1050-2947). Vol. 91 (2015), 4,
[Artikel, refereegranskad vetenskaplig]

The creation of tunable open quantum systems is becoming feasible in current experiments with ultracold atoms in low-dimensional traps. In particular, the high degree of experimental control over these systems allows detailed studies of tunneling dynamics, e.g., as a function of the trapping geometry and the interparticle interaction strength. In order to address this exciting opportunity we present a theoretical framework for two-body tunneling based on the rigged Hilbert space formulation. In this approach, bound, resonant, and scattering states are included on an equal footing and we argue that the coupling of all these components is vital for a correct description of the relevant threshold phenomena. In particular, we study the tunneling mechanism for two-body systems in one-dimensional traps and different interaction regimes. We find a strong dominance of sequential tunneling of single particles for repulsive and weakly attractive systems, while there is a signature of correlated pair tunneling in the calculated many-particle flux for strongly attractive interparticle interaction.



Denna post skapades 2015-06-12. Senast ändrad 2015-07-28.
CPL Pubid: 218273

 

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Institutioner (Chalmers)

Institutionen för fundamental fysik (2005-2015)

Ämnesområden

Fysik

Chalmers infrastruktur

 


Projekt

Denna publikation är ett resultat av följande projekt:


Ab initio approach to nuclear structure and reactions (++) (ANSR) (EC/FP7/240603)