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Pseudospin-filter tunneling of massless Dirac fermions
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Pseudospin-filter tunneling of massless Dirac fermions
The tunneling of the massless Dirac fermions through a vector potential barrier are theoretically investigated,where the vector potential can be introduced by very high and very thin(δ-function)magnetic potential barriers.We show that,distinct from the previously studied electric barrier tunneling,the vector potential barriers are more transparent for pseudospin-1/2 Dirac fermions but more obstructive for pseudospin-1 Dirac fermions.By tuning the height of the vector potential barrier,the pseudospin-1/2 Dirac fermions remain transmitted,whereas the transmission of the pseudospin-1 Dirac fermions is forbidden,leading to a pseudospin filtering effect for massless Dirac fermions.
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