摘要
Three-dimensional type-ⅡWeyl fermions possess overtilted cone-like low-energy band dispersion.Unlike the closed ellipsoidal Fermi surface for type-ⅠWeyl fermions,the Fermi surface is an open hyperboloid for type-ⅡWeyl fermions.We evaluate the spin and density susceptibility of type-ⅡWeyl fermions with repulsive S-wave interaction by means of Green’s functions.We obtain the particle–hole continuum along the tilted momentum direction and perpendicular to the tilted momentum direction respectively.We find the zero sound mode in some repulsive interaction strengths by numerically solving the pole equations of the susceptibility within the random-phase approximation.
作者
王勋高
孙远
刘亮
刘伍明
Xun-Gao Wang;Yuan Sun;Liang Liu;Wu-Ming Liu(Beijing National Laboratory for Condensed Matter Physics.Institue of Plysics,Chinese Academy of Sciences,Beijing 100190,China;School of Physcal Sciences,University of Chinese Academy of Sciences,Beijing 100190,China;Key Laboratory of Quantum Optics,Shanghai Istiute of Optics and Fine Mechanics,Chinese Academy of Sciences,Shanghai 201800,China;Songshan Lake Materials Laboratory,Dongguan 523808,China)
基金
supported by the National Key R&D Program of China(Grant No.2016YFA0301500)
the National Natural Science Foundation of China(Grants No.61835013)
the Strategic Priority Research Program of the Chinese Academy of Sciences(Grant Nos.XDB01020300 and XDB21030300)。
