Dilute 3He atoms in dense 4He films on graphite show T-squared heat capacity, suggesting they move as Dirac fermions confined to domain walls.
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Fluidity in Domain Walls in Dilute $^3$He-$^4$He Films on Graphite: Possible 1D Fermi Fluid and Dirac Fermions in Helium Film
Dilute 3He atoms in dense 4He films on graphite show T-squared heat capacity, suggesting they move as Dirac fermions confined to domain walls.