Excitation-photon-energy selectivity of photoconversions in halogen-bridged Pd-chain compounds: Mott insulator to metal or charge-density-wave state

Ultrafast photoinduced transitions of a one-dimensional Mott insulator into two distinct electronic phases, metal and charge-density-wave (CDW) state, were achieved in a bromine-bridged Pd-chain compound [Pd(en)2Br](C5-Y)2H2O (en=ethylenediamine and C5-Y=dialkylsulfosuccinate), by selecting the phot...

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Bibliographic Details
Published in:Physical review letters 2014-08, Vol.113 (9), p.096403-096403, Article 096403
Main Authors: Matsuzaki, H, Iwata, M, Miyamoto, T, Terashige, T, Iwano, K, Takaishi, S, Takamura, M, Kumagai, S, Yamashita, M, Takahashi, R, Wakabayashi, Y, Okamoto, H
Format: Article
Language:English
Subjects:
Electronics
Excitation
Femtosecond
Insulators
Optical switching
Palladium
Phases
Selectivity
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Summary:Ultrafast photoinduced transitions of a one-dimensional Mott insulator into two distinct electronic phases, metal and charge-density-wave (CDW) state, were achieved in a bromine-bridged Pd-chain compound [Pd(en)2Br](C5-Y)2H2O (en=ethylenediamine and C5-Y=dialkylsulfosuccinate), by selecting the photon energy of a femtosecond excitation pulse. For the resonant excitation of the Mott-gap transition, excitonic states are generated and converted to one-dimensional CDW domains. For the higher-energy excitation, free electron and hole carriers are produced, giving rise to a transition of the Mott insulator to a metal. Such selectivity in photoconversions by the choice of initial photoexcited states opens a new possibility for the developments of advanced optical switching and memory functions.
ISSN:0031-9007
1079-7114
DOI:10.1103/physrevlett.113.096403