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Title

Dimensional Crossover in a Charge Density Wave Material Probed by Angle-Resolved Photoemission Spectroscopy

Authors
Nicholson, C. W.
Puppin, M.
Berger, H.
Wolf, M.
Hoesch, M.
Monney, C.
Published in Physical Review Letters. 2017, vol. 118, no. 20, p. 206401
Abstract 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.
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Research group Groupe Giamarchi
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NICHOLSON, C. W. et al. Dimensional Crossover in a Charge Density Wave Material Probed by Angle-Resolved Photoemission Spectroscopy. In: Physical Review Letters, 2017, vol. 118, n° 20, p. 206401. https://archive-ouverte.unige.ch/unige:94365

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Deposited on : 2017-05-22

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