The CPT Kondo Lattice with spin-orbit interaction

We consider the CPT Kondo Lattice[1,2], in which conduction electrons are antiferromagnetically coupled to a Yao-Lee spin liquid. This model has been shown to describe a fractionalized spinor order parameter with spontaneous time-reversal symmetry breaking, and gapless Majorana excitations. Here we demonstrate that when a Rashba spin-orbit interaction with nearest-neighbor Kondo interaction is introduced, the Majorana bands become gapped and develop Chern numbers, developing unidirectionally propagating Majorana edge modes. Our model describes a chiral triplet superconductor with spontaneous broken time-reversal symmetry and may be of interest for certain heavy fermion superconductors, such as UTe2.

[1] Piers. Coleman, Aditya Panigrahi and Alexei M. Tsvelik, Phys. Rev. Lett, 129, 177601 (2022).

[2] Alexei M. Tsvelik and Piers Coleman, Phys. Rev. B 106, 125144 (2022).