  Higher order topological superconductors hosting Majorana-Kramers pairs
(MKPs) as corner modes have recently been proposed in a two-dimensional (2D)
quantum spin Hall insulator (QSHI) proximity-coupled to unconventional cuprate
or iron-based superconductors. Here, we show that such MKPs can be realized
using a conventional s-wave superfluid with a soliton in cold atom systems
governed by the Hubbard-Hofstadter model. The MKPs emerge in the presence of
interaction at the "corners" defined by the intersections of line solitons and
the one-dimensional edges of the system. Our scheme is based on the recently
realized cold atom Hubbard-Hofstadter lattice and will pave the way for
observing Majorana corner modes and possible higher order topological
superfluidity with conventional s-wave superfluids/superconductors.
