Magnetism and topology are two major areas of condensed matter physics. The combination of magnetism and topology gives rise to more novel physical effects, which have attracted strongly theoretical and experimental attention. Recently, the concept of altermagnetism has been introduced, characterized by a dual nature: real-space antiparallel spins with zero total magnetic moment and reciprocal-space anisotropic spin polarization. The amalgamation of altermagnetism with topology may lead to the emergence of previously unobserved topological phases and the associated physical effects. In this study, utilizing a four-band lattice model that incorporates altermagnetism and spin group symmetry, we demonstrate that type-I, type-II, and type-III bipolarized Weyl semimetals can exist in altermagnetic systems. Through the first-principles electronic structure calculations, we predict four ideal two-dimensional type-I altermagnetic bipolarized Weyl semimetals ${\mathrm{Fe}}_2{\mathrm{WTe}}_4$ and ${\mathrm{Fe}}_2{\mathrm{MoZ}}_4$ $(Z=\mathrm{S}, \mathrm{Se}, \mathrm{Te})$. More significantly, we introduce the quantum crystal valley Hall effect, a phenomenon achievable in three of these materials namely ${\mathrm{Fe}}_2{\mathrm{WTe}}_4$, ${\mathrm{Fe}}_2{\mathrm{MoS}}_4$, and ${\mathrm{Fe}}_2{\mathrm{MoSe}}_4$, when spin-orbit coupling is considered. Therefore, our work not only enriches the topological phases but also provides a material platform for studying novel topological phases in altermagnetism.

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• First-principles calculations
• Magnetism
• Topological materials
• Topological phases of matter
• Altermagnets
• Weyl semimetal
• Symmetries