Christopher W. Nicholson, Christophe Berthod, Michele Puppin, Helmuth Berger, Martin Wolf, Moritz Hoesch, and Claude Monneyr:
Phys. Rev. Lett. 118 (20), 206401 (2017), pp 5;
arXiv:1610.05024 [cond-mat.str-el] (2016), pp. 9;
DOI: arXiv:1610.05024 [cond-mat.str-el]
High-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.
The original publication is available by link DOI: 10.1103/PhysRevLett.118.206401