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J. Phys. Soc. Jpn. 75 (2006) 123701 (4 pages)  |Previous Article| |Next Article|  |Table of Contents|
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Ultrafast Photoconversion from Charge Density Wave State to Mott–Hubbard State in One-Dimensional Extended Peierls–Hubbard System of Br-Bridged Pd Compound

Hiroyuki Matsuzaki¹, Masahiro Yamashita² and Hiroshi Okamoto^1,3

¹Department of Advanced Materials Science, Graduate School of Frontier Sciences, University of Tokyo, Kashiwa, Chiba 277-8561
²Department of Chemistry, Graduate School of Science, Tohoku University and CREST, Japan Science and Technology Agency (JST), Sendai 980-8578
³Correlated Electron Research Center (CERC), National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8562

(Received August 25, 2006; Accepted October 4, 2006; Published November 27, 2006)

Photoconversion from a charge density wave (CDW) state to a Mott–Hubbard (MH) state in a one-dimensional (1D) extended Peierls–Hubbard system is observed by femtosecond (fs) reflection spectroscopy. The Br-bridged Pd compound examined is located near the CDW-MH phase boundary, and the irradiation of a fs laser pulse causes the instantaneous formation of a 1D MH domain without alternation of bridging-Br displacements. This result demonstrates the important role of intersite Coulomb repulsion in the transition, and in the stabilization of the CDW state. The formation of the MH domain is followed by a coherent oscillation with a period of 360 fs attributable to the relaxation of the bridging-Br displacements coupled with the charge-transfer between neighboring Pd ions. ©2006 The Physical Society of Japan

KEYWORDS: charge density wave, Mott–Hubbard, coherent oscillation, photoinduced phase transition
URL: http://jpsj.ipap.jp/link?JPSJ/75/123701/
DOI: 10.1143/JPSJ.75.123701

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