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Recently, a 2D orthorhombic silver-organic framework, Ag3C20 monolayer, wassynthesized by assembling organic molecules linked with multiple aryl-metalbonds. Herein, via first-principles study, we demonstrate that owing to theunique bonding feature, Ag3C20 monolayer not only exhibits strong mechanicalanisotropy, but also possesses various tunable direction-dependent Diracstates. Around the Fermi level blow, the intrinsic Dirac points form twoantiparallel quasi type-III nodal lines protected by mirror symmetry, which canfurther evolve into hybrid nodal loops under tiny strains. Intriguingly, nearthe Fermi level above, a special semi-Dirac state can emerge under a criticalstrain by merging two type-I Dirac cone, which harbors direction-dependentstrongly localized fermions, normal massive carries, and ultrafast Diracfermions at the same time. These findings suggest that the mechanicallysensitive Ag3C20 monolayer is a promising 2D material to realize theinteresting Dirac physics and highly anisotropic multiple carries transport.

Mechanical Anisotropy and Multiple Direction-Dependent Dirac States in the Synthesized Ag3C20 Monolayer