Optical Absorption in the Presence of a Uniform Field

Tharmalingam, K.

doi:10.1103/physrev.130.2204

Cited by 286 publications

(76 citation statements)

References 5 publications

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“…Modulation of the dielectric function ε(ω) in the presence of electromagnetic fields has been a subject of investigation for many years. The change under a static electric field is known as the Franz-Keldysh effect (FKE) [9][10][11][12][13][14][15][16], and that under an alternating electric field is known as the dynamical FKE (DFKE) [17][18][19][20][21][22]. An important parameter which distinguishes DFKE from the static FKE is the adiabaticity parameter γ = U p /Ω, where U p = e 2 E 2 /4µΩ 2 is the ponderomotive energy, and Ω is the frequency of the field, µ is the reduced mass of the electron, and E is the electic field [19].…”

Section: Introductionmentioning

confidence: 99%

Femtosecond time-resolved dynamical Franz-Keldysh effect

et al. 2016

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We theoretically investigate the dynamical Franz-Keldysh effect in femtosecond time resolution, that is, the time-dependent modulation of a dielectric function at around the band gap under an irradiation of an intense laser field. We develop a pump-probe formalism in two distinct approaches: first-principles simulation based on real-time time-dependent density functional theory and analytic consideration of a simple two-band model. We find that, while time-average modulation can be reasonably described by the static Franz-Keldysh theory, a remarkable phase shift is found to appear between the dielectric response and the applied electric field.

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Section: Introductionmentioning

confidence: 99%

Femtosecond time-resolved dynamical Franz-Keldysh effect

et al. 2016

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“…∆T shows positive and ∆Ab shows negative values below 4.8 eV. In the static FKE, the absorption below the band gap shows positive value, which is the tunneling assisted photoabsorption [12]. The negative value in ∆Ab indicates photo-emission.…”

Section: Methodsmentioning

confidence: 97%

“…The modulation of ε(ω) in the presence of electromagnetic fields has also been the subject of investigation for many years. The change under a static electric field is known as the Franz-Keldysh effect (FKE) [10][11][12][13][14][15][16][17], and under an alternating electric field is known as the dynamical FKE (DFKE) [18][19][20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Multi-Scale Simulation for Transient Absorption Spectroscopy under Intense Few-Cycle Pulse Laser

Otobe

2016

Photonics

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Numerical pump-probe simulations for the sub-cycle transient spectroscopy of thin film diamond under intense few cycle pulse laser field is reported. The electron dynamics is calculated by the time-dependent Kohn-Sham equation. Simultaneously, the propagation of electromagnetic field is calculated by the Maxwell equation. Our result shows that the modulation of the reflectivity, transmission, and absorption around the optical gap do not coincide with the field amplitude of the pump laser. The phase shift of the modulation with respect to the pump field depends on the pump intensity and probe frequency. The modulation of the reflectivity is sensitive to the choice of the exchange-correlation potential, and dynamical effect of the mean-field in meta-GGA potential.

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“…The modulation of the dielectric function ε(ω) in the presence of electromagnetic fields has been a subject of investigation for many years. The change in the dielectric function under a static electric field is known as the Franz-Keldysh effect (FKE) [9][10][11][12][13][14][15][16], and the change under an alternating electric field is known as the dynamical FKE (DFKE) [17][18][19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Time-resolved dynamical Franz-Keldysh effect produced by an elliptically polarized laser

Otobe

2016

Phys. Rev. B

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The analytical formula for the time-resolved dynamical Franz-Keldysh effect (Tr-DFKE) under an elliptically polarized laser in sub-femtosecond time-scale is reported. The Houston function is assumed as the time-dependent wave function of the parabolic two-band system. The resulting formula shows the sub-cycle change of the optical properties for elliptically polarization; the modulation of the dielectric function becomes smaller than that of linear polarization. On the other hand, the subcycle modulation of the dielectric function disappears for a circularly polarized laser, which is a significant feature of the Tr-DFKE. This analytical formulas show good qualitative agreement with the first-principle calculation employing the time-dependent density functional theory for diamond.

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Optical Absorption in the Presence of a Uniform Field

Cited by 286 publications

References 5 publications

Femtosecond time-resolved dynamical Franz-Keldysh effect

Femtosecond time-resolved dynamical Franz-Keldysh effect

Multi-Scale Simulation for Transient Absorption Spectroscopy under Intense Few-Cycle Pulse Laser

Time-resolved dynamical Franz-Keldysh effect produced by an elliptically polarized laser

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