Bulletin of the American Physical Society
55th Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics
Monday–Friday, June 3–7, 2024; Fort Worth, Texas
Session N03: Quantum Gases in Low Dimensions
8:00 AM–10:00 AM,
Thursday, June 6, 2024
Room: 201A
Chair: Chuan-Hsun Li, Purdue University
Abstract: N03.00003 : Superfluidity in inhomogeneous 2D Bose-Einstein condensates*
8:24 AM–8:36 AM
Presenter:
Yanda Geng
(University of Maryland College Park)
Authors:
Yanda Geng
(University of Maryland College Park)
Shouvik Mukherjee
(University of Maryland, College Park)
Junheng Tao
(University of Maryland College Park)
Mingshu Zhao
(University of Maryland, College Park)
Stephen Eckel
(NIST)
Gretchen K Campbell
(Joint Quantum Institute, NIST and UMD)
Ian B Spielman
(Joint Quantum Institute, NIST and UMD)
Collaboration:
Yanda Geng, Shouvik Mukherjee, Junheng Tao, Mingshu Zhao, Stephen P. Eckel, Gretchen K. Campbell, Ian B. Spielman
In our experiment, we prepare a quasi-2D 23Na Bose-Einstein condensate confined in a 2D box potential. We spatially modulate the condensate to create an inhomogeneous density profile, on which the dynamics of low-lying sound excitation is observed. We measure the speed of sound along and orthogonal to the 1D inhomogeneities; the case of a 1D lattice, studied in [1, 2], serves as a reference case. The anisotropic speed of sound reveals a reduction of the component of the superfluid density tensor along the modulation direction. Different inhomogeneities potentially change the superfluid density differently, and we compare each case to the result of Leggett [3].
[1] G. Chauveau, C. Maury, F. Rabec, C. Heintze, G. Brochier, S. Nascimbene, J. Dalibard, J. Beugnon, S. M. Roccuzzo, and S. Stringari, Superfluid Fraction in an Interacting Spatially Modulated Bose-Einstein Condensate, Phys. Rev. Lett. 130, (2023).
[2] J. Tao, M. Zhao, and I. B. Spielman, Observation of Anisotropic Superfluid Density in an Artificial Crystal, Phys. Rev. Lett. 131, (2023).
[3] A. J. Leggett, Can a Solid Be “Superfluid”?, Phys. Rev. Lett. 25, 1543 (1970).
*This work was partially supported by the National Institute of Standards and Technology, and the National Science Foundation through the Physics Frontier Center at the Joint Quantum Institute (PHY-1430094) and the Quantum Leap Challenge Institute for Robust Quantum Simulation (OMA-2120757).
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