In 3D disordered pseudospin-s fermions the leading quantum interference correction to conductivity has universal magnitude matching conventional metals but sign fixed by parity of 2s, yielding WAL for half-integer s and WL for integer s.
The corresponding effective Hamiltonian is given by Hs(k) =ℏvk·S,(A1) whereS= (S x, Sy, Sz)denotes the spin-srepresentation of the SU(2) generators andvis a characteristic velocity
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Localization and universality of three-dimensional pseudospin-$s$ fermions
In 3D disordered pseudospin-s fermions the leading quantum interference correction to conductivity has universal magnitude matching conventional metals but sign fixed by parity of 2s, yielding WAL for half-integer s and WL for integer s.