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  Polaronic Conductivity in the Photoinduced Phase of 1T−TaS2

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.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0028-1A50-B Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0028-2EF0-D
Genre: Journal Article

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PhysRevLett.106.016401.pdf (Publisher version), 666KB
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2011
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http://arxiv.org/abs/1009.3807 (Preprint)
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 Creators:
Dean, N.1, Author
Petersen, Jesse C.1, 2, Author              
Fausti, Daniele1, 2, Author              
Tobey, R. I.1, 3, Author
Kaiser, Stefan2, 4, Author              
Gasparov, L. V.5, Author
Berger, H.6, Author
Cavalleri, Andrea1, 2, 4, Author              
Affiliations:
1Department of Physics, Clarendon Laboratory, University of Oxford, ou_persistent22              
2Condensed Matter Dynamics Division, Max Planck Research Department for Structural Dynamics, Department of Physics, University of Hamburg, External Organizations, ou_2173637              
3Condensed Matter Physics and Material Sciences Department, Brookhaven National Laboratory, Upton, New York 11973, USA, ou_persistent22              
4Centre for Free Electron Laser Science, Notkestraße 85, 22607 Hamburg, Germany, ou_persistent22              
5Department of Chemistry and Physics, University of North Florida, 4567 St. Johns Bluff Road, South Jacksonville, Florida 32224, USA, ou_persistent22              
6Institue of Physics of Complex Matter, École Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland, ou_persistent22              

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Free keywords: PACS numbers: 71.45.Lr, 63.20.kd, 73.20.Mf, 78.47.jg
 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.

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Language(s): eng - English
 Dates: 2010-09-012011-01-042011-01-07
 Publication Status: Published in print
 Pages: 4
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1103/PhysRevLett.106.016401
arXiv: 1009.3807
 Degree: -

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Title: Physical Review Letters
  Abbreviation : Phys. Rev. Lett.
Source Genre: Journal
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Publ. Info: Woodbury, N.Y. : American Physical Society
Pages: - Volume / Issue: 106 (1) Sequence Number: 016401 Start / End Page: - Identifier: ISSN: 0031-9007
CoNE: /journals/resource/954925433406_1