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We study the quantum correction to conductivity on the surface of cubictopological Kondo insulators with multiple Dirac bands. We consider the modelof time-reversal invariant disorder which induces the scattering of theelectrons within the Dirac bands as well as between the bands. When onlyintraband scattering is present we find three long-range diffusion modes whichlead to weak antilocalization correction to conductivity, which remainsindependent of the microscopic details such as Fermi velocities and relaxationtimes. Interband scattering gaps out two diffusion modes leaving only onelong-range mode. We find that depending on the value of the phase coherencetime, either three or only one long-range diffusion modes contribute to weaklocalization correction rendering the quantum correction to conductivitynon-universal. We provide an interpretation for the results of the recenttransport experiments on samarium hexaboride where weak antilocalization hasbeen observed.

Non-universal weak antilocalization effect in cubic topological Kondo insulators