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The asymmetric properties of Janus two-dimensional materials commonly dependon chemical effects, such as different atoms, elements, material types, etc.Herein, based on carbon gene recombination strategy, we identify an intrinsicnon-chemical Janus configuration in a novel purely sp$^2$ hybridized carbonmonolayer, named as Janus-graphene. With the carbon gene of tetragonal,hexagonal, and octagonal rings, the spontaneous unilateral growth of carbonatoms drives the non-chemical Janus configuration in Janus-graphene, which istotally different from the chemical effect in common Janus materials such asMoSSe. A structure-independent half-auxetic behavior is mapped inJanus-graphene that the structure maintains expansion whether stretched orcompressed, which lies in the key role of $p_z$ orbital. The unprecedentedhalf-auxeticity in Janus-graphene extends intrinsic auxeticity into pure sp$^2$hybrid carbon configurations. With the unique half-auxeticity emerged in thenon-chemical Janus configuration, Janus-graphene enriches the functional carbonfamily as a promising candidate for micro/nanoelectronic device applications.

Janus-graphene: a two-dimensional half-auxetic carbon allotropes with non-chemical Janus configuration