Effect of interactions in the interference pattern of Bose-Einstein condensates

Year: 2020

Authors: Burchianti A., D’Errico C., Marconi L., Minardi F., Fort C., Modugno M.

Autors Affiliation: Istituto Nazionale di Ottica, CNR-INO, 50019 Sesto Fiorentino, Italy; LENS and Dipartimento di Fisica e Astronomia, Università di Firenze, 50019 Sesto Fiorentino, Italy; Istituto per la Protezione Sostenibile delle Piante, CNR-IPSP, 10135 Torino, Italy; Dipartimento di Fisica e Astronomia, Università di Bologna, 40127 Bologna, Italy: Department of Physics, University of the Basque Country UPV/EHU, 48080 Bilbao, Spain; IKERBASQUE, Basque Foundation for Science, 48013 Bilbao, Spain

Abstract: Understanding the effect of interactions in the phase evolution of expanding atomic Bose-Einstein condensates is fundamental to describing the basic phenomenon of matter wave interference. Many theoretical and experimental works tackled this problem, always with the implicit assumption that the mutual interaction between two expanding condensates rigidly modifies the phase evolution through an effective force. In this paper, we present a combined experimental and theoretical investigation of the interference profile of expanding 87Rb condensates, with a specific focus on the effect of interactions. We come to the different conclusion that the mutual interaction produces local modifications of the condensate phase only in the region where the wave packets overlap.

Journal/Review: PHYSICAL REVIEW A

Volume: 102 (4)      Pages from: 043314-1  to: 043314-9

More Information: We acknowledge fruitful discussions with M. Fattori, L. Masi, M. Prevedelli, R. Corgier, and A. Smerzi and we thank M. Inguscio for continuous support. This work was supported by the Spanish Ministry of Science, Innovation and Universities and the European Regional Development Fund FEDER through Grant No. PGC2018-101355-B-I00 (MCIU/AEI/FEDER, UE), by the Basque Government through Grant No. IT986-16, by the European Commission through FET Flagship on Quantum Technologies-Qombs Project (Grant No. 820419), and by Fondazione Cassa di Risparmio Firenze through project “SUPERACI-Superfluid Atomic Circuits.”
KeyWords: Cold atoms and matter waves,Interparticle interactions,Interferometry
DOI: 10.1103/PhysRevA.102.043314

Citations: 6
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