Faculté des sciences

Lattice-distortion-enhanced electron-phonon coupling and Fermi surface nesting in 1T-TaS2

Clerc, Florian ; Battaglia, Corsin ; Bovet, M ; Despont, Laurent ; Monney, Claude ; Cercellier, Hervé ; Garnier, Michael Bernard Gunnar ; Aebi, Philipp ; Berger, Helmuth ; Forró, László

In: Physical Review B, 2006, vol. 74, no. 155114, p. 1-7

The temperature dependence of the electronic structure of the quasi-two-dimensional material 1T-TaS2 is revisited by considering angle-resolved photoemission spectroscopy (ARPES) and density functional theory to calculate the imaginary part of the static electronic susceptibility characterizing the nesting strength. While nesting appears to play a role in the high temperature... Plus

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    Summary
    The temperature dependence of the electronic structure of the quasi-two-dimensional material 1T-TaS2 is revisited by considering angle-resolved photoemission spectroscopy (ARPES) and density functional theory to calculate the imaginary part of the static electronic susceptibility characterizing the nesting strength. While nesting appears to play a role in the high temperature phase, the ARPES line shapes reveal peculiar spectral properties which are not consistent with the standard two-dimensional Peierls scenario for the formation of a charge density wave. The temperature dependence of these anomalous spectral features suggests a lattice-distortion enhanced electron-phonon interaction.