Bonn 2025 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 27: Poster – Ultra-cold Atoms, Ions and BEC (joint session A/Q)
Q 27.16: Poster
Tuesday, March 11, 2025, 14:00–16:00, Tent
An Atomtronic Toolbox for Josephson Physics — •Florian Binoth1, Erik Bernhart1, Marvin Röhrle1, Leon Scherne1, Monika Mayer1, Vijay Pal Singh2, Ludwig Mathey3,4, Luigi Amico2,5,6, and Herwig Ott1 — 1Department of Physics and Research Center OPTIMAS, RPTU Kaiserslautern-Landau, Kaiserslautern, Germany — 2Quantum Research Centre, Technology Innovation Institute, Abu Dhabi, UAE — 3Zentrum für Optische Quantentechnologien and Institut für Quantenphysik, Universität Hamburg, Hamburg, Germany — 4The Hamburg Centre for Ultrafast Imaging, Hamburg, Germany — 5Dipartimento di Fisica e Astronomia, Università di Catania, Catania, Italy — 6INFN-Sezione di Catania, Catania, Italy
We present an atomtronic toolbox to investigate Bose-Einstein condensates in spatially and temporally modulated optical potential landscapes. Our platform enables the arbitrary creation of such potentials with acousto-optical deflectors and a digital micromirror device. We additionally work on implementing a novel sub-wavelength dark state barrier using a pair of resonant Raman beams with differing transverse modes. The potentials are projected onto the atoms with an objective inside the vacuum chamber. Combining DC and AC drive, we have observed the occurrence of Shapiro steps in superconducting Josephson junctions. These are plateaus in the current-voltage characteristic, which form today’s voltage standard. We show that these steps exhibit universal features and that they are directly connected to phonon emission and soliton nucleation.
Keywords: Atomtronics; Josephson; Shapiro Steps; Dark State Barrier; Quantum Toolbox