# How can one localize the massless fermions in Dirac materials?

I noticed that finite electric potential cannot localize the low energy excitations in a graphene sheet. Is it possible to localize the massless fermions in the surface band of topological insulators with a magnetic field?

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 What do you mean "localize"? Do you mean make bound states? – Ron Maimon Sep 16 '11 at 19:02 Yes. That is what I mean. – Z.Sun Sep 16 '11 at 19:50