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Article dans une revue

Robust Dirac-Cone Band Structure in the Molecular Kagome Compound (EDT-TTF-CONH2)(6) Re6Se8(CN)(6)

Abstract :

(EDT-TTF-CONH2)(6)[Re6Se8(CN)(6)] is a molecular solid with R3 space group symmetry and has the remarkable feature of exhibiting hybrid donor layers with a kagome topology which sustain metallic conductivity. We report a detailed study of the structural evolution of the system as a function of temperature and pressure. This rhombohedral phase is maintained on cooling down to 220 K or up to 0.7 GPa pressure, beyond which a symmetry-breaking transition to a triclinic PI phase drives a metal to insulator transition. Band structures calculated from the structural data lead to a clear description of the effects of temperature and pressure on the structural and electronic properties of this system. Linear energy dispersion is calculated at the zero-gap Fermi level where valence and conduction bands touch for the rhombohedral phase. (EDT-TTF-CONH2)(6)[Re6Se8(CN)(6)] thus exhibits a regular (right circular) Dirac-cone like that of graphene at the Fermi level, which has not been reported previously in a molecular solid. The Dirac-cone is robust over the stability region of the rhombohedral phase, and may result in exotic electronic transport and optical properties.

Type de document :
Article dans une revue
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Soumis le : mercredi 15 septembre 2021 - 10:10:52
Dernière modification le : jeudi 9 décembre 2021 - 15:46:06

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S. Carlsson, Leokadiya Zorina, D. Allan, J. Attfield, Enric Canadell, et al.. Robust Dirac-Cone Band Structure in the Molecular Kagome Compound (EDT-TTF-CONH2)(6) Re6Se8(CN)(6). Inorganic Chemistry, American Chemical Society, 2013, 52 (6), pp.3326-3333. ⟨10.1021/ic302790m⟩. ⟨hal-03344538⟩



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