Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Creation of Half-metallic f -orbital Dirac Fermion with Superlight
  Elements in Orbital-Designed Molecular Lattice   Magnetism in solids generally originates from the localized $d$- or
$f$-orbitals that are hosted by heavy transition-metal elements. Here, we
demonstrate a novel mechanism for designing half-metallic $f$-orbital Dirac
fermion from superlight $sp$-elements. Combining first-principles and model
calculations, we show that bare and flat-band-sandwiched (FBS) Dirac bands can
be created when C$_{20}$ molecules are deposited into a 2D hexagonal lattice,
which are composed of $f$-molecular orbitals (MOs) derived from $sp$-atomic
orbitals (AOs). Furthermore, charge doping of the FBS Dirac bands induces
spontaneous spin-polarization, converting the system into a half-metallic Dirac
state. Based on this discovery, a model of spin field effect transistor is
proposed to generate and transport 100\% spin-polarized carriers. Our finding
illustrates a novel concept to realize exotic quantum states by manipulating
MOs, instead of AOs, in orbital-designed molecular crystal lattices.

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The categories of this paper are: mtrl-th
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The categories of this paper are: chao-dyn
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The categories of this paper are: adap-org
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The categories of this paper are: econ
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The categories of this paper are: eess
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The categories of this paper are: plasm-ph
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The categories of this paper are: atom-ph
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The categories of this paper are: nucl-th
13
The categories of this paper are: quant-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: patt-sol
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The categories of this paper are: alg-geom
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The categories of this paper are: hep-lat
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The categories of this paper are: math
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The categories of this paper are: comp-gas
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The categories of this paper are: q-bio