Phys.org July 6, 2022 As the spatial dimension is lowered, locally stabilizing interactions are reduced, leading to the emergence of strongly fluctuating phases of matter without classical analogues. A team of researchers in the US (University of Tennessee, Argonne National Laboratory, Caltech, University of Indiana) describes the experimental observation of a one-dimensional quantum liquid of 4He using nanoengineering by confining it within a porous material preplated with a noble gas to enhance dimensional reduction. The resulting excitations of the confined 4He are qualitatively different than bulk superfluid helium and can be analyzed in terms of a mobile impurity allowing for […]