Ultrafast IR and THz spectroscopy of photo-induced insulator to metal transition in highly correlated organic system

Shinichiro Iwai

doi:10.1016/j.jlumin.2010.12.014

Ultrafast IR and THz spectroscopy of photo-induced insulator to metal transition in highly correlated organic system

Shinichiro Iwai

SCI - Physics

Research output: Contribution to journal › Article › peer-review

3 Citations (Scopus)

Abstract

Photo-induced insulator to metal transitions (PIMT) in quarter filled layered organic conductors ET [bis(ethylenedithio)tetrathiafulvalene]-based salts α-(ET)₂I₃, θ-(ET)₂RbZn(SCN) ₄, and κ-(d-ET)₂Cu[N(CN)₂Br] were investigated using ultrafast spectroscopy in the near, mid-infrared and terahertz (THz) regions. In charge ordered salts α-(ET)₂I ₃ and θ-(ET)₂RbZn(SCN)₄, an immediate (<30 fs) generation of a microscopic metallic state is driven by the electronic process. Subsequently, condensation of the microscopic metallic domain to the macroscopic scale is accompanied by a small molecular rearrangement in α-(ET)₂I₃. However, in θ-(ET)₂RbZn(SCN)₄, a large structural difference between the insulator and metallic phases prevents stabilization of the macroscopic metallic state. In a dimer Mott insulator κ-(d-ET) ₂Cu[N(CN)₂Br], photo-generation of the metallic state shows a finite rise time of ca. 1 ps, which is attributable to the photo-induced change of on-site Coulomb energy on each dimer (U_dim) through dimeric molecular rearrangement. Thus, the ultrafast dynamics of PIMT depend strongly on the molecular arrangement in the layer of ET salts.

Original language	English
Pages (from-to)	409-414
Number of pages	6
Journal	Journal of Luminescence
Volume	131
Issue number	3
DOIs	https://doi.org/10.1016/j.jlumin.2010.12.014
Publication status	Published - 2011 Mar 1

Keywords

Charge order
Correlated electron system
Mott insulator
Organic conductor
Photo-induced phase transition
Ultarfast spectroscopy

ASJC Scopus subject areas

Atomic and Molecular Physics, and Optics
Condensed Matter Physics
Chemistry(all)
Biochemistry
Biophysics

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@article{5ae27df8c8704ef48d5fa30e15aabe7a,

title = "Ultrafast IR and THz spectroscopy of photo-induced insulator to metal transition in highly correlated organic system",

abstract = "Photo-induced insulator to metal transitions (PIMT) in quarter filled layered organic conductors ET [bis(ethylenedithio)tetrathiafulvalene]-based salts α-(ET)2I3, θ-(ET)2RbZn(SCN) 4, and κ-(d-ET)2Cu[N(CN)2Br] were investigated using ultrafast spectroscopy in the near, mid-infrared and terahertz (THz) regions. In charge ordered salts α-(ET)2I 3 and θ-(ET)2RbZn(SCN)4, an immediate (<30 fs) generation of a microscopic metallic state is driven by the electronic process. Subsequently, condensation of the microscopic metallic domain to the macroscopic scale is accompanied by a small molecular rearrangement in α-(ET)2I3. However, in θ-(ET)2RbZn(SCN)4, a large structural difference between the insulator and metallic phases prevents stabilization of the macroscopic metallic state. In a dimer Mott insulator κ-(d-ET) 2Cu[N(CN)2Br], photo-generation of the metallic state shows a finite rise time of ca. 1 ps, which is attributable to the photo-induced change of on-site Coulomb energy on each dimer (Udim) through dimeric molecular rearrangement. Thus, the ultrafast dynamics of PIMT depend strongly on the molecular arrangement in the layer of ET salts.",

keywords = "Charge order, Correlated electron system, Mott insulator, Organic conductor, Photo-induced phase transition, Ultarfast spectroscopy",

author = "Shinichiro Iwai",

year = "2011",

month = mar,

day = "1",

doi = "10.1016/j.jlumin.2010.12.014",

language = "English",

volume = "131",

pages = "409--414",

journal = "Journal of Luminescence",

issn = "0022-2313",

publisher = "Elsevier",

number = "3",

}

TY - JOUR

T1 - Ultrafast IR and THz spectroscopy of photo-induced insulator to metal transition in highly correlated organic system

AU - Iwai, Shinichiro

PY - 2011/3/1

Y1 - 2011/3/1

N2 - Photo-induced insulator to metal transitions (PIMT) in quarter filled layered organic conductors ET [bis(ethylenedithio)tetrathiafulvalene]-based salts α-(ET)2I3, θ-(ET)2RbZn(SCN) 4, and κ-(d-ET)2Cu[N(CN)2Br] were investigated using ultrafast spectroscopy in the near, mid-infrared and terahertz (THz) regions. In charge ordered salts α-(ET)2I 3 and θ-(ET)2RbZn(SCN)4, an immediate (<30 fs) generation of a microscopic metallic state is driven by the electronic process. Subsequently, condensation of the microscopic metallic domain to the macroscopic scale is accompanied by a small molecular rearrangement in α-(ET)2I3. However, in θ-(ET)2RbZn(SCN)4, a large structural difference between the insulator and metallic phases prevents stabilization of the macroscopic metallic state. In a dimer Mott insulator κ-(d-ET) 2Cu[N(CN)2Br], photo-generation of the metallic state shows a finite rise time of ca. 1 ps, which is attributable to the photo-induced change of on-site Coulomb energy on each dimer (Udim) through dimeric molecular rearrangement. Thus, the ultrafast dynamics of PIMT depend strongly on the molecular arrangement in the layer of ET salts.

AB - Photo-induced insulator to metal transitions (PIMT) in quarter filled layered organic conductors ET [bis(ethylenedithio)tetrathiafulvalene]-based salts α-(ET)2I3, θ-(ET)2RbZn(SCN) 4, and κ-(d-ET)2Cu[N(CN)2Br] were investigated using ultrafast spectroscopy in the near, mid-infrared and terahertz (THz) regions. In charge ordered salts α-(ET)2I 3 and θ-(ET)2RbZn(SCN)4, an immediate (<30 fs) generation of a microscopic metallic state is driven by the electronic process. Subsequently, condensation of the microscopic metallic domain to the macroscopic scale is accompanied by a small molecular rearrangement in α-(ET)2I3. However, in θ-(ET)2RbZn(SCN)4, a large structural difference between the insulator and metallic phases prevents stabilization of the macroscopic metallic state. In a dimer Mott insulator κ-(d-ET) 2Cu[N(CN)2Br], photo-generation of the metallic state shows a finite rise time of ca. 1 ps, which is attributable to the photo-induced change of on-site Coulomb energy on each dimer (Udim) through dimeric molecular rearrangement. Thus, the ultrafast dynamics of PIMT depend strongly on the molecular arrangement in the layer of ET salts.

KW - Charge order

KW - Correlated electron system

KW - Mott insulator

KW - Organic conductor

KW - Photo-induced phase transition

KW - Ultarfast spectroscopy

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