Polaronic Conductivity in the Photoinduced Phase of 1T−TaS2

Dean, N.; Petersen, Jesse C.; Fausti, Daniele; Tobey, R. I.; Kaiser, Stefan; Gasparov, L. V.; Berger, H.; Cavalleri, Andrea

doi:10.1103/PhysRevLett.106.016401

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Polaronic Conductivity in the Photoinduced Phase of 1T−TaS₂

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http://dx.doi.org/10.1103/PhysRevLett.106.016401
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http://arxiv.org/abs/1009.3807
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PhysRevLett.106.016401.pdf
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Citation

Dean, N., Petersen, J. C., Fausti, D., Tobey, R. I., Kaiser, S., Gasparov, L. V., et al. (2011). Polaronic Conductivity in the Photoinduced Phase of 1T−TaS₂. Physical Review Letters, 106(1): 016401. doi:10.1103/PhysRevLett.106.016401.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0028-1A50-B

Abstract

The transient optical conductivity of photoexcited 1T−TaS₂ is determined over a three-order-of-magnitude frequency range. Prompt collapse and recovery of the Mott gap is observed. However, we find important differences between this transient metallic state and that seen across the thermally driven insulator-metal transition. Suppressed low-frequency conductivity, Fano phonon line shapes, and a midinfrared absorption band point to polaronic transport. This is explained by noting that the photoinduced metallic state of 1T−TaS₂ is one in which the Mott gap is melted but the lattice retains its low-temperature symmetry, a regime only accessible by photodoping.