Leggett’s bounds or how to quantify superfluidity

1. Superfluid fraction in an interacting spatially modulated Bose-Einstein condensate
Authors: R G. Chauveau, C. Maury, F. Rabec, C. Heintze, G. Brochier, S. Nascimbene, J. Dalibard, J. Beugnon, S. M. Roccuzzo, and S. Stringari
Phys. Rev. Lett. 130, 226003 (2023); DOI: 10.1103/PhysRevLett.130.226003
arXiv:2302.01776; DOI: 10.48550/arXiv.2302.01776

2. Observation of anisotropic superfluid density in an artificial crystal
Authors: Junheng Tao, Mingshu Zhao, and Ian Spielman
Phys. Rev. Lett. 131, 163401 (2023); DOI: 10.1103/PhysRevLett.131.163401
arXiv:2301.01258; DOI: 10.48550/arXiv.2301.01258

3. Superfluid fraction of interacting bosonic gases
Authors: Daniel Pérez-Cruz, Grigori E. Astrakharchik, and Pietro Massignan
arXiv:2403.08416 ; DOI: 10.48550/arXiv.2403.08416

Recommended with a commentary by Thierry Giamarchi , University of Geneva
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This commentary may be cited as:
DOI: 10.36471/JCCM_March_2024_01