For 3D Dirac fermions at charge neutrality the diffusion constant is purely quantum geometric in origin because the band velocity contribution cancels exactly, unlike in 2D.
Murakami, Phase transition between the quantum spin hall and insulator phases in 3d: emergence of a topologi- cal gapless phase, New Journal of Physics9, 356 (2007)
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Orbital magnetic moment suppresses total magnetoconductivities in gapless type-II Weyl semimetals in linear and nonlinear responses, with differences arising compared to type-I Weyl semimetals.
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Quantum geometric contribution to the diffusion constant
For 3D Dirac fermions at charge neutrality the diffusion constant is purely quantum geometric in origin because the band velocity contribution cancels exactly, unlike in 2D.
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Magneto-optical transport in type-II Weyl semimetals in the presence of orbital magnetic moment
Orbital magnetic moment suppresses total magnetoconductivities in gapless type-II Weyl semimetals in linear and nonlinear responses, with differences arising compared to type-I Weyl semimetals.