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Guiot, V., Cario, L., Janod, E., Corraze, B., Phuoc, T. V., Rozenberg, M., Stoliar, P., Cren, T. & Roditchev, D. (2013) Avalanche breakdown in GaTa4Se8 (-) Te-x(x) narrow-gap Mott insulators. Nat. Commun. 4 1722.
Added by: Laurent Cournède (2016-03-10 21:23:31) |
| Type de référence: Article DOI: 10.1038/ncomms2735 Numéro d'identification (ISBN etc.): 2041-1723 Clé BibTeX: Guiot2013 Voir tous les détails bibliographiques  |
Catégories: PMN Mots-clés: bandgap semiconductors, critical-behavior, electronic-properties, memories, possible superconductivity, transitions, wide Créateurs: Cario, Corraze, Cren, Guiot, Janod, Phuoc, Roditchev, Rozenberg, Stoliar Collection: Nat. Commun. |
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| Résumé |
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Mott transitions induced by strong electric fields are receiving growing interest. Recent theoretical proposals have focused on the Zener dielectric breakdown in Mott insulators. However, experimental studies are still too scarce to conclude about the mechanism. Here we report a study of the dielectric breakdown in the narrow-gap Mott insulators GaTa4Se8 (-) Te-x(x). We find that the I-V characteristics and the magnitude of the threshold electric field (E-th) do not correspond to a Zener breakdown, but rather to an avalanche breakdown. E-th increases as a power law of the Mott-Hubbard gap (E-g), in surprising agreement with the universal law E-th proportional to E-g(2.5) reported for avalanche breakdown in semiconductors. However, the delay time for the avalanche that we observe in Mott insulators is over three orders of magnitude greater than in conventional semiconductors. Our results suggest that the electric field induces local insulator-to-metal Mott transitions that create conductive domains that grow to form filamentary paths across the sample.
Added by: Laurent Cournède |