Quantum copycat: Researchers find a new way in which bosons behave like fermions

Phys.org  March 27, 2020
Researchers at Pennsylvania State University observed dynamical fermionization, where the momentum distribution of a T-G (Tonks-Girardeau) gas evolves from bosonic to fermionic after its axial confinement is removed. The asymptotic momentum distribution after expansion in one dimension is the distribution of rapidities, which are the conserved quantities associated with many-body integrable systems. Their measurements agree well with T-G gas theory. They also studied momentum evolution after the trap depth is suddenly changed to a new nonzero value, and we observed the theoretically predicted bosonic-fermionic oscillations…read more. TECHNICAL ARTICLE