Hamburg 2009 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 11: Quantengase: Bosonen im Gitter II
Q 11.6: Talk
Monday, March 2, 2009, 17:45–18:00, VMP 6 HS-A
Coherent control of dressed matter waves in strongly driven periodic potentials — •Oliver Morsch1, Alessandro Zenesini1, Hans Lignier1,2, Donatella Ciampini1, and Ennio Arimondo1 — 1CNR-INFM and Università di Pisa, Largo Pontecorvo 3, 51267 Pisa, Italy — 2PhLAM, Université de Lille, 59655 Villeneuve d'Ascq cedex, France
We demonstrate experimentally that matter waves in one-, two- and three-dimensional optical lattices can be "dressed" and thus given new properties by strongly driving the periodic potentials. In the driven lattices the tunneling probability and the tunneling phase between adjacent lattice sites become a function of the driving parameters [1]. We identify regimes in which the parameters of the driving can be changed in time without exciting the system, thus allowing coherent and adiabatic following. This coherent control is then used in order to reversibly induce the superfluid-Mott insulator phase transition by changing the strength of the driving [2]. Our findings pave the way towards detailed studies of driven quantum systems, in particular the conditions for adiabatic following, and suggest new methods for controlling matter waves.
[1] H. Lignier et al., Phys. Rev. Lett. 99, 220403 (2007). [2] A. Eckardt et al., Phys. Rev. Lett. 95, 260404 (2005).