In bulk 4Hb-TaS2 the T layers give one electron per 13 tantalum atoms to the H layers, emptying the T flat band; at the surface the transfer is incomplete, leaving a metallic chiral Fermi surface.
= Z Z dr′ 1dr′ 2 HBSE(r1 −R,r 2 −R;r ′ 1 −R,r ′ 2 −R) ×Ψ(r ′ 1 −R,r ′ 2 −R) (72) In the last equation, we have used the translational in- variance of the Hamiltonian
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Charge transfer empties the flat band in 4H$_b$-TaS$_2$ -- except at the surface
In bulk 4Hb-TaS2 the T layers give one electron per 13 tantalum atoms to the H layers, emptying the T flat band; at the surface the transfer is incomplete, leaving a metallic chiral Fermi surface.