Effects of strain on the Berry pole structure of multi-Weyl semimetals*

Multi-Weyl semimetals (multi-WSMs) are those materials where the topological Berry charge associated with the Weyl point in the spectrum is larger than one. Such points with higher topological charge are protected by lattice symmetries in the system. We specifically focus on double or 2-WSMs and investigate the effects of anisotropic strain on such materials, including strain that explicitly breaks these lattice symmetries. We study the evolution of the topological features of these materials such as the positions of the Berry poles and their associated Fermi arcs on the surface of the materials as a result of the applied strain. We further show the possibility of obtaining strain-induced Berry quadrupole moment in such materials and highlight the manifestation of these topological features through transport signatures in the presence of strain.