Resonance enhanced tunneling

重貴 松本

Carlo Sias, Alessandro Zenesini, Hans Lignier +4 more

We report on measurements of resonantly enhanced tunneling of Bose-Einstein condensates loaded into an optical lattice. By controlling the initial conditions of our system we were able to observe resonant tunneling in the ground and the first two excited states of the lattice wells. We also investigated the effect of the intrinsic nonlinearity of the condensate on the tunneling resonances.

Ciann‐Dong Yang

S. Guérin, Hans Rudolf Jauslin

We apply the tools of adiabatic Floquet theory to study the control of population transfer and tunneling processes by strong laser pulses. We show how tunneling can be enhanced by intermediate resonant levels by choosing appropriate pulse parameters. We obtain complete tunneling in times that are much shorter than the bare tunneling time or the times obtained without intermediate levels.

Sergej Flach A, V. Fleurov, А. А. Овчинников

We consider the tunneling of localized excitations (many boson bound states) in the presence of a bosonic bath. We show both analytically and numerically that the bath influence results in a dramatical enhancement of the amplitude of the excitation tunneling. The order of the bosonic flow in the course of the tunneling process is obtained. On the background of the giant tunneling enhancement we observe and describe additional resonant enhancement and suppression of tunneling due to avoided level crossings.