String Theory Journal Club

We build long-lived, localized excitations in a 1D Bose gas with contact repulsion (also known as the Lieb-Liniger model). Using a selective superposition of multi-hole momentum eigenstates, we demonstrate an enhancement of excitation lifetimes compared to previously proposed approaches. Venturing beyond the limits of the weak- and strong-interaction regimes, we numerically obtain soliton-like excitations at arbitrary interaction strength using ABACUS, building on our earlier analytical results in the infinite-repulsion (Tonks-Girardeau) regime. Our results showcase the significance of sustaining classical-like excitations in the finite-interaction regime, where the quantum nature of the system becomes inevitably prominent.