Progress made in measuring and interpreting the elementary excitations of superfluid and
normal liquid ${\hspace {0pt}}^ 4 {\rm He} $ in the past 25 years is reviewed. The goal is to …

We theoretically investigate the stochastic decay of persistent currents in a toroidal ultracold
atomic superfluid caused by a perturbing barrier. Specifically, we perform detailed three …

We suggest a method to construct exactly solvable Gross–Pitaevskii type equations,
especially the variable-coefficient high-order Gross–Pitaevskii type equations. We show that …

A bstract We develop an effective field theory (EFT) framework for superfluid 4 He to model
the interactions among quasiparticles, helium atoms and probe particles. Our effective field …

Liquid 4He becomes superfluid and flows without resistance below temperature 2.17 K.
Superfluidity has been a subject of intense studies and notable advances were made in …

We introduce a hybrid optomechanical system containing an annularly trapped Bose-
Einstein condensate (BEC) inside an optical cavity driven by Lauguerre-Gaussian (LG) …

The non-Hermitian dynamics of open systems deal with how intricate coherent effects of a
closed system intertwine with the impact of coupling to an environment. The system …

The t− J Hamiltonian of the spinful hard-core bosonic ring in the Nagaoka limit is solved. The
energy spectrum becomes quantized due to presence of spin, where each energy level …

This paper presents a multiferron system and analyzes the conditions under which it forms a
localized many-body state. We determined the self-trapping potential of this system and …

The successful prediction of new phenomena by scientific theories has gained much interest
in philosophy. I will discuss a case that is often taken to be such a successful prediction …