scholarly journals Collective excitations of strongly coupled bilayer charged Bose liquids in the third-frequency-moment sum rule

2008 ◽  
Vol 78 (11) ◽  
Author(s):  
Murat Tas ◽  
B. Tanatar
Keyword(s):  
Collective Excitations ◽  
Sum Rule ◽  
Strongly Coupled ◽  
The Third ◽  
Bose Liquids

Correlation effects on the third-frequency-moment sum rule of electron liquids

1987 ◽  
Vol 35 (6) ◽  
pp. 3003-3004 ◽  
Author(s):  
Naoki Iwamoto ◽  
E. K. U. Gross
Keyword(s):  
Correlation Effects ◽  
Sum Rule ◽  
The Third ◽  
Electron Liquids

scholarly journals Collective Reactions in the Continuum

2019 ◽  
Vol 7 ◽  
pp. 209
Author(s):  
P. Demetriou ◽  
A. Marcinkowski ◽  
P. E. Hodgson
Keyword(s):  
Experimental Data ◽  
Inelastic Scattering ◽  
Cross Sections ◽  
Absolute Magnitude ◽  
Collective Excitations ◽  
Scattering Data ◽  
Detailed Structure ◽  
Sum Rule ◽  
Neutron Inelastic Scattering ◽  
The Continuum

We show that pre-equlibrium inelastic scattering reactions to the continuum contain substantial collective components in addition to the multistep direct and multistep compound reactions. These collective reactions are investigated for the vibrational nuclei 56Fe, 58Ni, 90Zr, 93Nb, 208Pb and 209Bi , and the strongly-deformed, rotational W nucleus. The collective cross-sections are calculated using the experimental data for low-lying collective excitations supplemented where necessary by the giant multipole resonances evaluated using the energy-weight ed sum rule. The MSC and MSD cross-sections are evaluated by the Feshbach-Kerman-Koonin theory using a consistent set of parameters determined by analyses of (p, xn) reactions, that have practically no collective components. The results are compared with high-resolution neutron inelastic scattering data and prove able to account for the absolute magnitude of the cross-sections and also their detailed structure.

Collective excitations in strongly coupled ultra-relativistic plasmas

2009 ◽  
Vol 42 (21) ◽  
pp. 214018 ◽  
Author(s):  
Peter Hartmann ◽  
Gabor J Kalman ◽  
Kenneth I Golden ◽  
Zoltan Donko
Keyword(s):  
Collective Excitations ◽  
Strongly Coupled ◽  
Relativistic Plasmas

scholarly journals On the General Properties of Non-linear Optical Conductivities

2020 ◽  
Vol 181 (6) ◽  
pp. 2050-2070
Author(s):  
Haruki Watanabe ◽  
Yankang Liu ◽  
Masaki Oshikawa
Keyword(s):  
Electric Fields ◽  
Optical Conductivity ◽  
Current Response ◽  
Many Body ◽  
Third Order ◽  
Sum Rule ◽  
The Third ◽  
General Properties ◽  
Many Body Systems ◽  
Non Equilibrium

AbstractThe optical conductivity is the basic defining property of materials characterizing the current response toward time-dependent electric fields. In this work, following the approach of Kubo’s response theory, we study the general properties of the nonlinear optical conductivities of quantum many-body systems both in equilibrium and non-equilibrium. We obtain an expression of the second- and the third-order optical conductivity in terms of correlation functions and present a perturbative proof of the generalized Kohn formula proposed recently. We also discuss a generalization of the f-sum rule to a non-equilibrium setting by focusing on the instantaneous response.

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