Fig. 1: Schematic plot of Fermi surfaces of KWSs and KNLMs.

a The Fermi surface of a KWS where two Fermi pockets enclose one TRIM. b Spindle torus-type Fermi surface in a KNLM induced by a KNL (the dashed black line). c The Fermi surface of a KWS where each pocket encloses a different TRIM. d Octdong-type Fermi surface in KNLMs induced by a KNL. The gray dots in a–d indicate the position of TRIMs Γ1, Γ2. The touching points of the Fermi surfaces are circled by red dashed lines.