Bulletin of the American Physical Society
54th Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics
Volume 68, Number 7
Monday–Friday, June 5–9, 2023; Spokane, Washington
Session M07: Synthetic Gauge Fields and Spin-orbit Coupling
2:00 PM–4:00 PM,
Wednesday, June 7, 2023
Room: 206 B
Chair: Georg Raithel, University of Michigan
Abstract: M07.00005 : Momentum space Josephson oscillations in a spin-orbit coupled Bose-Einstein condensate*
2:48 PM–3:00 PM
Presenter:
Annesh Mukhopadhyay
(Washington State University)
Authors:
Annesh Mukhopadhyay
(Washington State University)
Md Kamrul Hoque Ome
(Washington State Univ)
Sean Mossman
(Washington State University)
Xi-Wang Luo
(University of Science and Technology of China)
Chuanwei Zhang
(University of Texas at Dallas)
Peter W Engels
(Washington State University)
Here, we demonstrate both experimentally and theoretically the study of Josephson oscillations in momentum space by exploiting the properties of a spin-orbit coupled BEC. By combining Raman detuning with a weak optical lattice, a supersolid-like stripe phase with periodic density modulation can be induced in the BEC. The Bogoliubov spectrum of such a supersolid-like phase corresponds to a pseudo-Goldstone mode due to the explicit breaking of translational symmetry by the weak lattice, the zero-momentum Bogoliubov gap gives the mass of the pseudo-Goldstone mode. We show that a subsequent Raman detuning quench leads to the Bogoliubov excitations in the form of spin oscillation, which can be interpreted in the language of Josephson physics. The measured oscillation frequencies are in good agreement with numerical simulations.
This combined experimental and theoretical study of Josephson oscillation in the context of spin-orbit coupled BECs establishes a new platform for the study of Josephson physics and, at the same time, provides a technique to probe the excitations of a BEC in the stripe phase.
*We acknowledge funding from NSF under grant PHY-1912540.
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