Growth dynamics of photoinduced domains in two-dimensional charge-ordered conductors depending on stabilization mechanisms

Yasuhiro Tanaka, Kenji Yonemitsu

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27 Citations (Scopus)

Abstract

Photoinduced melting of horizontal-stripe charge orders in quasi-two-dimensional organic conductors θ-(BEDT-TTF)2RbZn(SCN) 4 [BEDT-TTF = bis(ethylenedithio)tetrathiafulvalene] and α-(BEDT-TTF)2I3 is investigated theoretically. By numerically solving the time-dependent Schrödinger equation, we study the photoinduced dynamics in extended Peierls-Hubbard models on anisotropic triangular lattices within the Hartree-Fock approximation. The melting of the charge order needs more energy for θ-(BEDT-TTF)2RbZn(SCN) 4 than for α-(BEDT-TTF)2I3, which is a consequence of the larger stabilization energy in θ-(BEDT-TTF) 2RbZn(SCN)4. After local photoexcitation in the charge ordered states, the growth of a photoinduced domain shows anisotropy. In θ-(BEDT-TTF)2RbZn(SCN)4, the domain hardly expands to the direction perpendicular to the horizontal-stripes. This is because all the molecules on the hole-rich stripe are rotated in one direction and those on the hole-poor stripe in the other direction. They modulate horizontally connected transfer integrals homogeneously, stabilizing the charge order stripe by stripe. In α-(BEDT-TTF)2I3, lattice distortions locally stabilize the charge order so that it is easily weakened by local photoexcitation. The photoinduced domain indeed expands in the plane. These results are consistent with recent observation by femtosecond reflection spectroscopy.

Original languageEnglish
Article number024712
JournalJournal of the Physical Society of Japan
Volume79
Issue number2
DOIs
Publication statusPublished - 2010 Feb 1
Externally publishedYes

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conductors
stabilization
photoexcitation
melting
Hartree approximation
anisotropy
energy
spectroscopy
molecules

Keywords

  • Charge order
  • Metal-insulator transition
  • Photoinduced phase transition

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

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abstract = "Photoinduced melting of horizontal-stripe charge orders in quasi-two-dimensional organic conductors θ-(BEDT-TTF)2RbZn(SCN) 4 [BEDT-TTF = bis(ethylenedithio)tetrathiafulvalene] and α-(BEDT-TTF)2I3 is investigated theoretically. By numerically solving the time-dependent Schr{\"o}dinger equation, we study the photoinduced dynamics in extended Peierls-Hubbard models on anisotropic triangular lattices within the Hartree-Fock approximation. The melting of the charge order needs more energy for θ-(BEDT-TTF)2RbZn(SCN) 4 than for α-(BEDT-TTF)2I3, which is a consequence of the larger stabilization energy in θ-(BEDT-TTF) 2RbZn(SCN)4. After local photoexcitation in the charge ordered states, the growth of a photoinduced domain shows anisotropy. In θ-(BEDT-TTF)2RbZn(SCN)4, the domain hardly expands to the direction perpendicular to the horizontal-stripes. This is because all the molecules on the hole-rich stripe are rotated in one direction and those on the hole-poor stripe in the other direction. They modulate horizontally connected transfer integrals homogeneously, stabilizing the charge order stripe by stripe. In α-(BEDT-TTF)2I3, lattice distortions locally stabilize the charge order so that it is easily weakened by local photoexcitation. The photoinduced domain indeed expands in the plane. These results are consistent with recent observation by femtosecond reflection spectroscopy.",
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N2 - Photoinduced melting of horizontal-stripe charge orders in quasi-two-dimensional organic conductors θ-(BEDT-TTF)2RbZn(SCN) 4 [BEDT-TTF = bis(ethylenedithio)tetrathiafulvalene] and α-(BEDT-TTF)2I3 is investigated theoretically. By numerically solving the time-dependent Schrödinger equation, we study the photoinduced dynamics in extended Peierls-Hubbard models on anisotropic triangular lattices within the Hartree-Fock approximation. The melting of the charge order needs more energy for θ-(BEDT-TTF)2RbZn(SCN) 4 than for α-(BEDT-TTF)2I3, which is a consequence of the larger stabilization energy in θ-(BEDT-TTF) 2RbZn(SCN)4. After local photoexcitation in the charge ordered states, the growth of a photoinduced domain shows anisotropy. In θ-(BEDT-TTF)2RbZn(SCN)4, the domain hardly expands to the direction perpendicular to the horizontal-stripes. This is because all the molecules on the hole-rich stripe are rotated in one direction and those on the hole-poor stripe in the other direction. They modulate horizontally connected transfer integrals homogeneously, stabilizing the charge order stripe by stripe. In α-(BEDT-TTF)2I3, lattice distortions locally stabilize the charge order so that it is easily weakened by local photoexcitation. The photoinduced domain indeed expands in the plane. These results are consistent with recent observation by femtosecond reflection spectroscopy.

AB - Photoinduced melting of horizontal-stripe charge orders in quasi-two-dimensional organic conductors θ-(BEDT-TTF)2RbZn(SCN) 4 [BEDT-TTF = bis(ethylenedithio)tetrathiafulvalene] and α-(BEDT-TTF)2I3 is investigated theoretically. By numerically solving the time-dependent Schrödinger equation, we study the photoinduced dynamics in extended Peierls-Hubbard models on anisotropic triangular lattices within the Hartree-Fock approximation. The melting of the charge order needs more energy for θ-(BEDT-TTF)2RbZn(SCN) 4 than for α-(BEDT-TTF)2I3, which is a consequence of the larger stabilization energy in θ-(BEDT-TTF) 2RbZn(SCN)4. After local photoexcitation in the charge ordered states, the growth of a photoinduced domain shows anisotropy. In θ-(BEDT-TTF)2RbZn(SCN)4, the domain hardly expands to the direction perpendicular to the horizontal-stripes. This is because all the molecules on the hole-rich stripe are rotated in one direction and those on the hole-poor stripe in the other direction. They modulate horizontally connected transfer integrals homogeneously, stabilizing the charge order stripe by stripe. In α-(BEDT-TTF)2I3, lattice distortions locally stabilize the charge order so that it is easily weakened by local photoexcitation. The photoinduced domain indeed expands in the plane. These results are consistent with recent observation by femtosecond reflection spectroscopy.

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