Retrieving the complex polarizability of single plasmonic nanoresonators

2009 ◽  
Vol 80 (15) ◽  
Author(s):  
M. Celebrano ◽  
M. Savoini ◽  
P. Biagioni ◽  
M. Zavelani-Rossi ◽  
P.-M. Adam ◽  
...  
Keyword(s):  
Complex Polarizability

Complex polarizability as used to analyze dielectric relaxation measurements

1992 ◽  
Vol 270 (2) ◽  
pp. 146-153 ◽  
Author(s):  
E. S�nchez Mart�nez ◽  
R. D�az Calleja ◽  
W. Gun�er
Keyword(s):  
Dielectric Relaxation ◽  
Relaxation Measurements ◽  
Complex Polarizability

Measurement of the complex polarizability of electron traps in Bi_12SiO_20 by a moving-grating technique

1993 ◽  
Vol 18 (21) ◽  
pp. 1780 ◽  
Author(s):  
Ping Xia ◽  
J. M. C. Jonathan ◽  
J. P. Partanen ◽  
R. W. Hellwarth
Keyword(s):  
Electron Traps ◽  
Complex Polarizability

scholarly journals Complex Excited State Polarizabilities in the ADC/ISR Framework

2020 ◽  
Author(s):  
Maximilian Scheurer ◽  
Thomas Fransson ◽  
Patrick Norman ◽  
Andreas Dreuw ◽  
Dirk R. Rehn
Keyword(s):  
Excited States ◽  
Model Systems ◽  
Coupled Cluster ◽  
Complex Frequency ◽  
State Representation ◽  
Third Order ◽  
Dispersion Coefficients ◽  
Coupled Cluster Theory ◽  
Small Model ◽  
Complex Polarizability

<div><div><div><p>We present the derivation and implementation of complex, frequency-dependent polarizabilities for excited states using the algebraic-diagrammatic construction for the polarization propagator (ADC) and its intermediate state representation (ISR). Based on the complex polarizability we evaluate C<sub>6</sub> dispersion coefficients for excited states. The methodology is implemented up to third order in perturbation theory in the Python-driven adcc toolkit for the development and application of ADC methods. We exemplify the approach using small model systems and compare it to results from coupled-cluster theory and from experiments.</p></div></div></div>

scholarly journals Complex Excited State Polarizabilities in the ADC/ISR Framework

2020 ◽  
Author(s):  
Maximilian Scheurer ◽  
Thomas Fransson ◽  
Patrick Norman ◽  
Andreas Dreuw ◽  
Dirk R. Rehn
Keyword(s):  
Excited States ◽  
Model Systems ◽  
Coupled Cluster ◽  
Complex Frequency ◽  
State Representation ◽  
Third Order ◽  
Dispersion Coefficients ◽  
Coupled Cluster Theory ◽  
Small Model ◽  
Complex Polarizability

<div><div><div><p>We present the derivation and implementation of complex, frequency-dependent polarizabilities for excited states using the algebraic-diagrammatic construction for the polarization propagator (ADC) and its intermediate state representation (ISR). Based on the complex polarizability we evaluate C<sub>6</sub> dispersion coefficients for excited states. The methodology is implemented up to third order in perturbation theory in the Python-driven adcc toolkit for the development and application of ADC methods. We exemplify the approach using small model systems and compare it to results from coupled-cluster theory and from experiments.</p></div></div></div>

On the role of inertial effects and dipole-dipole coupling in the theory of the Debye and far-infrared absorption of polar fluids III. The cosine potential itinerant oscillator model

1989 ◽  
Vol 425 (1868) ◽  
pp. 169-213 ◽  
Keyword(s):  
Planck Equation ◽  
Far Infrared ◽  
Numerical Results ◽  
Oscillator Model ◽  
Velocity Correlation ◽  
Small Oscillations ◽  
Fokker Planck Equation ◽  
Dynamic Mobility ◽  
Complex Polarizability ◽  
Fokker Planck

The polarizability and dynamic mobility for the itinerant oscillator model are calculated when the restriction to small oscillations is removed so that effects due to the cosine potential may be evaluated. The calculation is effected by expressing the Fokker-Planck equation for equal frictions per unit inertia in terms of sum and difference angular variables. The sum angle, Χ, yields the Fokker-Planck equation for a free rotator, the correlation functions of which are available in closed form. The difference angle, η, yields the Fokker-Planck equation for a rotator in a cosine potential. This equation is solved by the method of separation of the variables. The resulting set of differential-difference equations for the time responses is solved by using Reid’s numerical algorithm. The complex polarizability is then evaluated from the numerical results by assuming that the moment of inertia of the dipole is very much less than that of the cage in accordance with the basic concept of the model. Unlike the complex polarizability, the dynamic mobility may be evaluated from the numerical results without any assumption about the inertia ratios. The polarizabilities computed for the cosine potential are compared with the small oscillation polarizabilities for the same parameter values. It is found that the cosine potential gives rise to (i) substantial absorption at frequencies between the microwave and far-infrared (fir), bands (ii) an increase in the frequency of the maximum microwave absorption (iii) a decrease in the frequency of the maximum fir absorption (iv) a much more rapid fall-off of the fir absorption. If the barrier height parameter becomes large, the intermediate frequency absorption disappears and the effect of the cosine potential manifests itself as a shoulder on the fir absorption. An approximate formula for the polarizability in terms of the Fourier transform of the angular velocity correlation function is shown to be satisfactory for small oscillations only. The theoretical results are in qualitative agreement with experimental observations on methyl chloride.

Zur Auswertung dielektrischer Relaxations­ messungen / Transformation method for evaluation of dielectric measurements

1977 ◽  
Vol 32 (9) ◽  
pp. 1059-1060 ◽  
Author(s):  
G. Schufmann ◽  
W. Gunßer
Keyword(s):  
Complex Permittivity ◽  
Low Frequency ◽  
Good Method ◽  
Transformation Method ◽  
Dispersion Curves ◽  
Dielectric Measurements ◽  
Complex Polarizability

Transformation of the complex permittivity ε* in a complex polarizability α' proved to be a good method for observing low frequency dispersions in solids. The effect of transformation is due to a shift in the maxima of the dispersion curves to higher frequencies.

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