Nicholson, C. W.Berthod, C.Puppin, M.Berger, H.Wolf, M.Hoesch, M.Monney, C.2017-07-102017-07-102017-07-10201710.1103/PhysRevLett.118.206401https://infoscience.epfl.ch/handle/20.500.14299/139086WOS:000401663500008High-resolution angle-resolved photoemission spectroscopy data reveal evidence of a crossover from one-dimensional (1D) to three-dimensional (3D) behavior in the prototypical charge density wave (CDW) material NbSe3. In the low-temperature 3D regime, gaps in the electronic structure are observed due to two incommensurate CDWs, in agreement with x-ray diffraction and electronic-structure calculations. At higher temperatures we observe a spectral weight depletion that approaches the power-law behavior expected in one dimension. From the warping of the quasi-1D Fermi surface at low temperatures, we extract the energy scale of the dimensional crossover. This is corroborated by a detailed analysis of the density of states, which reveals a change in dimensional behavior dependent on binding energy. Our results offer an important insight into the dimensionality of excitations in quasi-1D materials.text::journal::journal article::research article