Ultrafast response of plasmalike reflectivity edge in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mrow><mml:mo>(</mml:mo><mml:mi>TMTTF</mml:mi><mml:mo>)</mml:mo></mml:mrow><mml:mn>2</mml:mn></mml:msub><mml:mi>As</mml:mi><mml:msub><mml:mi mathvariant="normal">F</mml:mi><mml:mn>6</mml:mn></mml:msub></mml:mrow></mml:math>driven by a 7-fs 1.5-cycle strong-light field

Naitoh, Y.; Kawakami, Y.; Ishikawa, Takahiro; Sagae, Yuto; Itoh, Hirotake; Yamamoto, Kaoru; Sasaki, T.; Dressel, Martin; Ishihara, Sumio; Tanaka, Yasuhiro; Yonemitsu, Kenji; Iwai, Shinichiro

doi:10.1103/physrevb.93.165126

Cited by 15 publications

(37 citation statements)

References 20 publications

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“…The R/R spectrum at td = 0.1 ps shown in Fig. 15(b) is well reproduced by the Lorentz analysis (orange curve) on the assumption of a 1.8 % decrease in p  , a 12 % increase in  and a 11 % increase in the width of the vibrational peak at 0.165 eV [55,91] The temporal change in R/R, for td = 0-150 fs, measured using the 7-fs pulse (Iex = 0.8 mJ/cm 2 , 9.8 MV/cm -1 ) is shown in Fig. 16(a).…”

Section: Ultrafast Response Of Plasma-like Reflectivity Edge In (Tmttmentioning

confidence: 80%

Strong light-field effects driven by nearly single-cycle 7 fs light-field in correlated organic conductors

Kawakami

Itoh

Yonemitsu

et al. 2018

J. Phys. B: At. Mol. Opt. Phys.

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We have demonstrated transient charge localization effects with a driving high-frequency field of 7-fs, 1.5-cycle near infrared light in correlated organic conductors. In a layered organic conductor -(BEDT-TTF)2I3 (BEDT-TTF: bis[ethylenedithio]-tetrathiafulvalene), a transient short-range charge order (CO) state is induced in a metallic phase. In contrast to such drastic change in the electronic state from the metal to the transient CO in -(BEDT-TTF)2I3, dynamics of a field-induced reduction of a transfer integral are captured as a red shift of the plasma-like reflectivity edge in a quasi-one-dimensional organic conductor (TMTTF)2AsF6 (TMTTF: tetramethyltetrathiafulvalene). These studies on the field-induced charge localization have been motivated by the theory of dynamical localization on the basis of tight-binding models with no electron correlation under a strong continuous field. However, the results of pump-probe transient reflectivity measurements using nearly single-cycle 7-fs, 11 MV/cm pulses and the theoretical studies which are presented in this review indicate that the pulsed field contributes to the similar phenomenon with the help of a characteristic lattice structure and Coulomb repulsion.

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Section: Ultrafast Response Of Plasma-like Reflectivity Edge In (Tmttmentioning

confidence: 80%

Strong light-field effects driven by nearly single-cycle 7 fs light-field in correlated organic conductors

Kawakami

Itoh

Yonemitsu

et al. 2018

J. Phys. B: At. Mol. Opt. Phys.

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“…To investigate optical properties of various physical phases in (TMTTF) 2 PF 6 , while optical conductivities have been measured [12,13], they are poor temperature dependences. In addition, a plasmalike reflectivity edge peculiar to a metal state has been reported recently in the charge-ordered insulator phase of (TMTTF) 2 AsF 6 [14] which is one of the similar substances of (TMTTF) 2 PF 6 . Due to above situations, it is extremely difficult to extract the information of pure electronic excitations from observed optical conductivities.…”

Section: Introductionmentioning

confidence: 84%

The optical conductivity for a spin-Peierls ground state of (TMTTF)$_{2}$PF$_{6}$ with tetramer formation

Yamaguchi,

Iwano

2018

Preprint

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We theoretically investigate the optical conductivity of (TMTTF) 2 PF 6 in the spin-Peierls ground state within the framework of the exact diagonalization method at absolute zero temperature (T = 0). As an effective model, a 1/4-filled 1D (one-dimensional) extended Hubbard model with tetramerization is employed. Using appropriate parameters of the model which have already been reported, we clarify the electronic photoexcitation energies from the spin-Peierls ground state. Since some experiments indicate the formation of a tetramer in the spin-Peierls ground state of (TMTTF) 2 PF 6 , our results are useful to understand the effects of tetramerization on the optical properties of (TMTTF) 2 PF 6 .

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“…The reduction of transfer integral has been observed as a redshift of plasmalike reflectivity edge in (TMTTF) 2 AsF 6 (TMTTF: tetramethyltetrathiafulvalene). 45 This proposed mechanism for the photoinduced transition is essentially different from conventional photoinduced melting of charge order. Specifically, the photoinduced melting of charge order is triggered by a real excitation, but the photoinduced charge-ordered state is a light-dressed state induced by a virtual excitation, which results in parameter modulation of the effective Hamiltonian.…”

Section: Introductionmentioning

confidence: 91%

Photoinduced transition to charge-ordered phases from dynamical localization in the metallic phase of α−(BEDT-TTF)2I3

Oya

Takahashi

2018

Phys. Rev. B

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From theory, we investigate charge localization induced by higher-frequency off-resonance lightpulse excitation in the metallic phase of α-(BEDT-TTF) 2 I 3 by numerically solving the timedependent Schrödinger equation in the quarter-filled extended Hubbard model for the material. Around eaA (max) = 1, where eaA (max) is the maximum amplitude of the dimensionless vector potential of the pump pulse, the charge distribution is significantly changed by photoexcitation, and the light-pulse-induced collective charge oscillations continue after photoexcitation. Furthermore, the charge dynamics depend strongly on the polarization direction of the pump pulse. These results are consistent with experiment. The magnitudes of the effective transfer integrals are reduced by strong photoexcitation, and this precursory phenomenon for dynamical localization is mainly driven by a photoinduced change in the ratio of the effective transfer integrals between the two strongest bonds. For eaA (max) 2, the photoinduced transition to the charge-ordered state, which can be regarded as a light-dressed state, occurs because of dynamical localization. Furthermore, the type of photo-generated charge-ordered state can be controlled by choosing eaA (max) and the polarization direction.

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Ultrafast response of plasmalike reflectivity edge in(TMTTF)2AsF6driven by a 7-fs 1.5-cycle strong-light field

Abstract: The strong light-field effect of (TMTTF)2AsF6 was investigated utilizing 1.5-cycle, 7-fs infrared pulses. The ultarfast (~20 fs) and large (~40%) response of the plasma-like reflectivity edge (~0.7 eV) was analyzed by the changes in

Cited by 15 publications

References 20 publications

Strong light-field effects driven by nearly single-cycle 7 fs light-field in correlated organic conductors

Strong light-field effects driven by nearly single-cycle 7 fs light-field in correlated organic conductors

The optical conductivity for a spin-Peierls ground state of (TMTTF)$_{2}$PF$_{6}$ with tetramer formation

Photoinduced transition to charge-ordered phases from dynamical localization in the metallic phase of α−(BEDT-TTF)2I3

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