Symmetry analysis restricts exactly four double-Weyl points to 28 space groups; a chiral carbon allotrope THRLN-C32 is proposed as a candidate with strain-tunable transitions to other Weyl complexes or a trivial insulator.
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Symmetry-protected four double-Weyl fermions and their topological phase transitions in nonmagnetic crystals
Symmetry analysis restricts exactly four double-Weyl points to 28 space groups; a chiral carbon allotrope THRLN-C32 is proposed as a candidate with strain-tunable transitions to other Weyl complexes or a trivial insulator.