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L ∝ B even in equilibrium, but this current is unimportant to the transport calculation and we therefore ignore it.
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Although not crucial, this assumption simplifies the analysis.
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The precise number will depend on the sample size.
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Observe that in contrast to the case of vacuum Dirac fermions familiar to high-energy physicists, this decomposition is unambiguous in a crystal since electrons emanating from the two Weyl points carry distinct crystal-symmetry quantum numbers; this is also why a mass term is forbidden by symmetry.
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