Time-resolved measurement of Landau-Zener tunneling in different bases

Year: 2010

Authors: Tayebirad G, Zenesini A., Ciampini D., Mannella R., Morsch O., Arimondo E., Lörch N., Wimberger S.

Autors Affiliation: Institut für Theoretische Physik, Universität Heidelberg, Philosophenweg 19, D-69120 Heidelberg, Germany; Institut für Experimentalphysik, University of Innsbruck, Technikerstrasse 25, A-6020 Innsbruck, Austria; Consorzio Nazionale Italiano di Struttura della Materia (CNISM)-Pisa, Dipartimento di Fisica, Università di Pisa, Lgo Pontecorvo 3, I-56127 Pisa, Italy; Istituto Nazionale di Ottica (INO)-CNR, Dipartimento di Fisica, Università di Pisa, Lgo Pontecorvo 3, I-56127 Pisa, Italy

Abstract: A comprehensive study of the tunneling dynamics of a Bose-Einstein condensate in a tilted periodic potential is presented. We report numerical and experimental results on time-resolved measurements of the Landau-Zener tunneling of ultracold atoms introduced by the tilt, which experimentally is realized by accelerating the lattice. The use of different protocols enables us to access the tunneling probability, numerically as well as experimentally, in two different bases, namely, the adiabatic basis and the diabatic basis. The adiabatic basis corresponds to the eigenstates of the lattice, and the diabatic one to the free-particle momentum eigenstates. Our numerical and experimental results are compared with existing two-state Landau-Zener models.

Journal/Review: PHYSICAL REVIEW A

Volume: 82 (1)      Pages from: 13633-1  to: 13633-8

More Information: We gratefully acknowledge funding by the EU project NAMEQUAM, the CNISM Progetto Innesco 2007, and the Excellence Initiative by the German Research Foundation (DFG) through the Heidelberg Graduate School of Fundamental Physics (Grant No. GSC 129/1) and the Global Networks Mobility Measures. G. Tayebirad thanks the Landesgraduiertenforderung Baden-Wurttemberg for support.
KeyWords: Bloch Oscillations; Dynamics; Atoms; Interference; Breakdown
DOI: 10.1103/PhysRevA.82.013633

Citations: 38
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