  Multifold fermion systems feature free fermionic excitations, which have no
counterparts in high-energy physics, and exhibit several unconventional
properties. Using first-principles calculations, we predict that strain
engineering can be used to control the distribution of topological charges in
transition metal silicide candidate CoSi, hosting multifold fermions. We
demonstrate that breaking the rotational symmetry of the system, by choosing a
suitable strain, destroys the multifold fermions, and at the same time results
in the creation of Weyl points. We introduce a low energy effective model to
complement the results obtained from density functional calculations. Our
findings suggest that strain-engineering is a useful approach to tune
topological properties of multifold fermions.
