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Article Dans Une Revue Physical Review Letters Année : 2017

Disorder-driven metal-insulator transitions in deformable lattices

Domenico Di Sante
  • Fonction : Auteur
Simone Fratini
Vladimir Dobrosavljević
  • Fonction : Auteur

Résumé

We show that in presence of a deformable lattice potential, the nature of the disorder-driven metal-insulator transition (MIT) is fundamentally changed with respect to the non-interacting (Anderson) scenario. For strong disorder, even a modest electron-phonon interaction is found to dramatically renormalize the random potential, opening a mobility gap at the Fermi energy. This process, which reflects disorder-enhanced polaron formation, is here given a microscopic basis by treating the lattice deformations and Anderson localization effects on the same footing. We identify an intermediate "bad insulator" transport regime which displays resistivity values exceeding the Mott-Ioffe-Regel limit and with a negative temperature coefficient, as often observed in strongly disordered metals. Our calculations reveal that this behavior originates from significant temperature-induced rearrangements of electronic states due to enhanced interaction effects close to the disorder-driven MIT.
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Dates et versions

hal-01907885 , version 1 (29-10-2018)

Identifiants

Citer

Domenico Di Sante, Simone Fratini, Vladimir Dobrosavljević, Sergio Ciuchi. Disorder-driven metal-insulator transitions in deformable lattices. Physical Review Letters, 2017, 118 (3), pp.036602. ⟨10.1103/PhysRevLett.118.036602⟩. ⟨hal-01907885⟩

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