Ultrafast phase control in one-dimensional correlated electron systems

Shinichiro Iwai, Hiroshi Okamoto

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64 Citations (Scopus)


One-dimensional (1D) correlated electron systems are good targets for the exploration of photoinduced phase transitions (PIPTs). This is because photocarrier generations and/or charge transfer (CT) excitations by lights can stimulate instabilities inherent to the 1D nature of electronic states through strong electron-electron interactions and electron(spin)-lattice interactions. In this paper, we review the ultrafast dynamics of three typical PIPTs observed in 1D correlated electron systems: 1) a photoinduced transition from a Mott insulator to a metal in a halogen-bridged Ni-chain compound, [Ni(chxn) 2Br]Br2 (chxn = cyclohexanediamine); 2) a photoinduced melting of a spin-Peierls phase in an organic CT compound, K- tetracyanoquinodimethane (TCNQ); 3) a photoinduced transition between neutral (N) and ionic (I) states in an organic CT compound, tetrathiafulvalene-p- chloranil (TTF-CA). The primary dynamics of these PIPTs are discussed on the basis of the results of femtosecond pump-probe spectroscopy.

Original languageEnglish
Article number011007
JournalJournal of the Physical Society of Japan
Issue number1
Publication statusPublished - 2006 Jan


  • Coherent phonon
  • Correlated electron systems
  • Insulator-metal transition
  • Neutral-ionic transition
  • Spin-peierls transition
  • Ultrafast spectroscopy


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