Incommensurable matter-wave jets in quasi-1D geometry

• Main Authors: Mežnaršič, Tadej, Žitko, Rok, Gosar, Katja, Pirman, Jure, Arh, Katja, Jug, Matevž, Zupanič, Erik, Jeglič, Peter
• Format: Journal Article
• Language: English
• Published: 13.03.2023
• Subjects: Physics - Atomic Physics; Physics - Pattern Formation and Solitons; Physics - Quantum Gases; Physics - Quantum Physics
• DOI: 10.48550/arxiv.2303.07004

Matter-wave jets are ejected from a Bose-Einstein condensate subjected to a modulation of the interaction strength. For sufficiently strong modulation additional higher harmonic matter-wave jets emerge. Here we report the first experimental observation of incommensurable "golden" $\frac{1+\sqrt{5}}{2}$ matter-wave jets in a Bose-Einstein condensate exposed to a single frequency interaction modulation. We study the formation of higher-order jets and the corresponding incommensurable density waves in quasi-one-dimensional geometry with numerical one dimensional (1D) Gross-Pitaevskii equation simulation. We explore the process of jet formation experimentally and theoretically for a wide range of modulation amplitudes and frequencies and establish a phase diagram delineating different regimes of jet formation.