We have observed tunneling suppression and photon-assisted tunneling of Bose-Einstein condensates in an optical lattice subjected to a constant force plus a sinusoidal shaking. For a sufficiently large constant force, the ground energy levels of the lattice are shifted out of resonance and tunneling is suppressed; when the shaking is switched on, the levels are coupled by low-frequency photons and tunneling resumes. Our results agree well with theoretical predictions and demonstrate the usefulness of optical lattices for studying solid-state phenomena.
Observation of photon-assisted tunneling in optical lattices / Sias, Carlo; Lignier, H; Singh, Yp; Zenesini, A; Ciampini, D; Morsch, O; Arimondo, E.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 100:4(2008), p. 040404. [10.1103/PhysRevLett.100.040404]
Observation of photon-assisted tunneling in optical lattices
SIAS, CARLO;
2008
Abstract
We have observed tunneling suppression and photon-assisted tunneling of Bose-Einstein condensates in an optical lattice subjected to a constant force plus a sinusoidal shaking. For a sufficiently large constant force, the ground energy levels of the lattice are shifted out of resonance and tunneling is suppressed; when the shaking is switched on, the levels are coupled by low-frequency photons and tunneling resumes. Our results agree well with theoretical predictions and demonstrate the usefulness of optical lattices for studying solid-state phenomena.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
