Borisenko, S. V.Kordyuk, A. A.Zabolotnyy, V. B.Inosov, D. S.Evtushinsky, D.Buechner, B.Yaresko, A. N.Varykhalov, A.Follath, R.Eberhardt, W.Patthey, L.Berger, H.2010-11-302010-11-302010-11-30200910.1103/PhysRevLett.102.166402https://infoscience.epfl.ch/handle/20.500.14299/60270WOS:000265479300047Using angle-resolved photoemission spectroscopy, we report on the direct observation of the energy gap in 2H-NbSe2 caused by the charge-density waves (CDW). The gap opens in the regions of the momentum space connected by the CDW vectors, which implies a nesting mechanism of CDW formation. In remarkable analogy with the pseudogap in cuprates, the detected energy gap also exists in the normal state (T > T-0) where it breaks the Fermi surface into "arcs," it is nonmonotonic as a function of temperature with a local minimum at the CDW transition temperature (T-0), and it forestalls the superconducting gap by excluding the nested portions of the Fermi surface from participating in superconductivity.Charge-Density-WaveTransition-Metal DichalcogenidesDependent Superconductivity2H-Nbse22H-Tase2MechanismStatetext::journal::journal article::research article