SKM 2023 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 38: Nonequilibrium Quantum Many-Body Systems II (joint session TT/DY)
TT 38.4: Talk
Wednesday, March 29, 2023, 15:45–16:00, HSZ 204
Classical route to ergodicity and scarring phenomena in a two-component Bose-Josephson junction — Debabrata Mondal1, Sudip Sinha1, •Sayak Ray2, Johann Kroha2, and Subhasis Sinha1 — 1Indian Institute of Science Education and Research Kolkata, Mohanpur, Nadia 741246, India — 2Physikalisches Institut, Rheinische Friedrich-Wilhelms-Universität Bonn, Nußallee 12, 53115 Bonn, Germany
We consider a Bose-Josephson junction (BJJ) formed by the binary mixture of ultracold atoms to investigate the manifestation of coherent collective dynamics on ergodicity and quantum scars, unfolding the connection between them. By tuning the inter and intra-species interaction, we demonstrate a rich variety of Josephson dynamics and transitions between them, which plays a crucial role in controlling the overall ergodic behaviour. The signature of underlying classicality is revealed from the entanglement spectrum, which also elucidates the formation of quantum scars of unstable steady states and of periodic orbits leading to athermal behaviour in a reduced Hilbert space. We show how the degree of ergodicity across the energy band and the scarring phenomena can be probed from the auto-correlation function as well from the phase fluctuation of the condensates, which has relevance in cold atom experiments. The model can also be realized in spin systems with application to information processing and lattice-gauge simulation.
[1] D. Mondal, S. Sinha, S. Ray, J. Kroha, and S. Sinha, Phys. Rev. A 106, 043321 (2022)