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The electronic state of WTe2, a candidate of type-II Weyl semimetal, isinvestigated by using laser-based spin- and angle-resolved photoemissionspectroscopy (SARPES). We prepare the pair of WTe2 samples, one with (001)surface and the other with (00-1) surface, by "sandwich method", and measurethe band structures of each surface separately. The Fermi arcs are observed onboth surfaces. We identify that the Fermi arcs on the two surfaces are bothoriginating from surface states. We further find a surface resonance band,which connects with the Fermi-arc band, forming a Dirac-cone-like banddispersion. Our results indicate that the bulk electron and hole bands are muchcloser in momentum space than band calculations.

Selective observation of surface and bulk bands in polar WTe2 by laser-based spin- and angle-resolved photoemission spectroscopy