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Collective modes of type-II Weyl fermions with repulsive S-wave interaction |
| Xun-Gao Wang(王勋高)1,2,3, Yuan Sun(孙远)3, Liang Liu(刘亮)3, and Wu-Ming Liu(刘伍明)1,2,4,† |
1 Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
2 School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100190, China;
3 Key Laboratory of Quantum Optics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China;
4 Songshan Lake Materials Laboratory, Dongguan 523808, China |
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Abstract Three-dimensional type-II Weyl fermions possess overtilted cone-like low-energy band dispersion. Unlike the closed ellipsoidal Fermi surface for type-I Weyl fermions, the Fermi surface is an open hyperboloid for type-II Weyl fermions. We evaluate the spin and density susceptibility of type-II Weyl 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.
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Received: 08 November 2021
Revised: 23 November 2021
Accepted manuscript online: 26 November 2021
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PACS:
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67.85.Lm
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(Degenerate Fermi gases)
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72.15.Nj
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(Collective modes (e.g., in one-dimensional conductors))
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| Fund: Project supported by the National Key R&D Program of China (Grant No. 2016YFA0301500), the National Natural Science Foundation of China (Grants No. 61835013), and the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant Nos. XDB01020300 and XDB21030300). We are grateful to Sun FaDi for useful discussions. |
Corresponding Authors:
Wu-Ming Liu
E-mail: wliu@iphy.ac.cn
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Cite this article:
Xun-Gao Wang(王勋高), Yuan Sun(孙远), Liang Liu(刘亮), and Wu-Ming Liu(刘伍明) Collective modes of type-II Weyl fermions with repulsive S-wave interaction 2022 Chin. Phys. B 31 026701
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