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Using angle-resolved photoemission spectroscopy (ARPES), we report on thedirect observation of the energy gap in 2H-NbSe2 caused by the charge-densitywaves (CDW). The gap opens in the regions of the momentum space connected bythe CDW vectors, which implies a nesting mechanism of CDW formation. Inremarkable analogy with the pseudogap in cuprates, the detected energy gap alsoexists in the normal state (T>T0) where it breaks the Fermi surface into'arcs', it is non-monotonic as a function of temperature with a local minimumat the CDW transition temperature (T0) and it forestalls the superconductinggap by excluding the nested portions of the Fermi surface from participating insuperconductivity.

Two energy gaps and Fermi surface 'arcs' in NbSe2