Crystal Thermal Transport in Altermagnetic RuO 2

We demonstrate the emergence of a pronounced thermal transport in the recently discovered class of magnetic materials-altermagnets. From symmetry arguments and first-principles calculations performed for the showcase altermagnet, RuO_{2}, we uncover that crystal Nernst and crystal thermal Hall effects in this material are very large and strongly anisotropic with respect to the Néel vector. We find the large crystal thermal transport to originate from three sources of Berry's curvature in momentum space: the Weyl fermions due to crossings between well-separated bands, the strong spin-flip pseudonodal surfaces, and the weak spin-flip ladder transitions, defined by transitions among very weakly spin-split states…

• DF
  Deutsche Forschungsgemeinschaft

  Awards: DFG-TRR 173/2-268565370, 44880005, DFG-TRR 288-422213477
• NN
  National Natural Science Foundation of China

  Awards: 12321004, 12234003, 12304066, 12274027
• NS
  Natural Science Foundation of Jiangsu Province

  Award: BK20230684
• NK
  National Key Research and Development Program of China

  Awards: 2022YFA1403800, 2022YFA1402600