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Magnetism in solids generally originates from the localized $d$- or$f$-orbitals that are hosted by heavy transition-metal elements. Here, wedemonstrate a novel mechanism for designing half-metallic $f$-orbital Diracfermion from superlight $sp$-elements. Combining first-principles and modelcalculations, we show that bare and flat-band-sandwiched (FBS) Dirac bands canbe created when C$_{20}$ molecules are deposited into a 2D hexagonal lattice,which are composed of $f$-molecular orbitals (MOs) derived from $sp$-atomicorbitals (AOs). Furthermore, charge doping of the FBS Dirac bands inducesspontaneous spin-polarization, converting the system into a half-metallic Diracstate. Based on this discovery, a model of spin field effect transistor isproposed to generate and transport 100\% spin-polarized carriers. Our findingillustrates a novel concept to realize exotic quantum states by manipulatingMOs, instead of AOs, in orbital-designed molecular crystal lattices.

Creation of Half-metallic f -orbital Dirac Fermion with Superlight Elements in Orbital-Designed Molecular Lattice