Tournier-Colletta, C.Moreschini, L.Autes, G.Moser, S.Crepaldi, A.Berger, H.Walter, A. L.Kim, K. S.Bostwick, A.Monceau, P.Rotenberg, E.Yazyev, O. V.Grioni, M.2013-10-012013-10-012013-10-01201310.1103/PhysRevLett.110.236401https://infoscience.epfl.ch/handle/20.500.14299/95229WOS:000320115000017We report a comprehensive study of the paradigmatic quasi-1D compound (TaSe4)(2)I performed by means of angle-resolved photoemission spectroscopy (ARPES) and first-principles electronic structure calculations. We find it to be a zero-gap semiconductor in the nondistorted structure, with non-negligible interchain coupling. Theory and experiment support a Peierls-like scenario for the charge-density wave formation below T-CDW = 263 K, where the incommensurability is a direct consequence of the finite interchain coupling. The formation of small polarons, strongly suggested by the ARPES data, explains the puzzling semiconductor-to-semiconductor transition observed in transport at T-CDW.Electronic Instability in a Zero-Gap Semiconductor: The Charge-DensityWave in (TaSe4)(2)Itext::journal::journal article::research article