Dielectric matrix and plasmon dispersion in strongly coupled electronic bilayer liquids

Golden, Kenneth I.; Mahassen, Hania; Kalman, G.; Senatore, G.; Rapisarda, Francesco

doi:10.1103/physreve.71.036401

Cited by 11 publications

(9 citation statements)

References 71 publications

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“…A method has been recently proposed [73,74,75,76] for the extension of the QLCA to take some of the neglected effects into account by combining the D L (k), D T (k) as local field factors with the Vlasov density-density response. In this approximation…”

Section: Quasi Localized Charge Approximationmentioning

confidence: 99%

Dynamical correlations and collective excitations of Yukawa liquids

Donkó¹,

Kalman²,

Hartmann³

2008

J. Phys.: Condens. Matter

159

193

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Abstract.In dusty (complex) plasmas, containing mesoscopic charged grains, the grain-grain interaction in many cases can be well described through a Yukawa potential. In this Review we summarize the basics of the computational and theoretical approaches capable of describing many-particle Yukawa systems in the liquid and solid phases and discuss the properties of the dynamical density and current correlation spectra of three-and two-dimensional strongly coupled Yukawa systems, generated by molecular dynamics simulations. We show details of the ω(k) dispersion relations for the collective excitations in these systems, as obtained theoretically following the quasilocalized charge approximation, as well as from the fluctuation spectra created by simulations. The theoretical and simulation results are also compared with those obtained in complex plasma experiments.

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Section: Quasi Localized Charge Approximationmentioning

confidence: 99%

Dynamical correlations and collective excitations of Yukawa liquids

Donkó¹,

Kalman²,

Hartmann³

2008

J. Phys.: Condens. Matter

159

193

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“…In Fig. 1 we compare the spin-averaged pair-distribution functions of a bilayer, g 11 bi ͑r͒ ͑intralayer͒ and g 12 bi ͑r͒ ͑interlayer͒, as obtained from the diffusion Monte Carlo simulations, 31 with the spinresolved pair-distribution functions g ↑↑ m ͑r͒ and g ↑↓ m ͑r͒ of the reference monolayer. 32 It is seen that there is an overall good agreement between the corresponding distribution functions, i.e., g 11 bi agrees with g ↑↑ m and g 12 bi with g ↑↓ m .…”

Section: ͑14͒mentioning

confidence: 99%

“…As ⌳ increases, the agreement between the bilayer pair-distribution function g 12 bi ͑r͒ and the monolayer pair-distribution function g ↑↓ m ͑r͒ will deteriorate. However, the disagreement between the interlayer correlations and the unlike-spin correlation in the reference monolayer is more severe at small r than at large r. 31 The pair-distribution function at small values of r, in turn, should control the behavior of the LFFs at large wave vector q ӷ 2k F , while the main contribution to the Coulomb drag, at low densities, comes from scattering processes with q near 2k F . Thus, we see that our approach could be justified for the problem at hand, even when the interlayer spacing is less than or comparable to the in-layer interparticle distance, ⌳Շr s a B * , which is the case in the experiments of interest here.…”

Section: ͑14͒mentioning

confidence: 99%

Exchange and correlation effects on plasmon dispersions and Coulomb drag in low-density electron bilayers

et al. 2007

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We investigate the effect of exchange and correlation ͑XC͒ on the plasmon spectrum and the Coulomb drag between spatially separated low-density two-dimensional electron layers. We adopt a different approach, which employs dynamic XC kernels in the calculation of the bilayer plasmon spectra and of the plasmon-mediated drag, and static many-body local field factors in the calculation of the particle-hole contribution to the drag. The spectrum of bilayer plasmons and the drag resistivity are calculated in a broad range of temperatures taking into account both intra-and interlayer correlation effects. We observe that both plasmon modes are strongly affected by XC corrections. After the inclusion of the complex dynamic XC kernels, a decrease of the electron density induces shifts of the plasmon branches in opposite directions. This is in stark contrast with the tendency observed within random phase approximation that both optical and acoustical plasmons move away from the boundary of the particle-hole continuum with a decrease in the electron density. We find that the introduction of XC corrections results in a significant enhancement of the transresistivity and qualitative changes in its temperature dependence. In particular, the large high-temperature plasmon peak that is present in the random phase approximation is found to disappear when the XC corrections are included. Our numerical results at low temperatures are in good agreement with the results of recent experiments by Kellogg et al. ͓Solid State Commun. 123, 515 ͑2002͔͒.

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“…where Ω G (d) is a functional of h 12 (r) as given in [17]. In the BPBL h 12 (r) is governed by a central peak h ′ 12 (r) around r = 0 [2] (see Fig.…”

mentioning

confidence: 99%

Collective Excitations in Electron-Hole Bilayers

2007

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We report a combined analytic and molecular dynamics analysis of the collective mode spectrum of a bipolar (electron-hole) bilayer in the strong coupling classical limit. A robust, isotropic energy gap is identified in the out-of-phase spectra, generated by the combined effect of correlations and of the excitation of the bound dipoles. In the in-phase spectra we identify longitudinal and transverse acoustic modes wholly maintained by correlations. Strong nonlinear generation of higher harmonics of the fundamental dipole oscillation frequency and the transfer of harmonics between different modes is observed.

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Dielectric matrix and plasmon dispersion in strongly coupled electronic bilayer liquids

Cited by 11 publications

References 71 publications

Dynamical correlations and collective excitations of Yukawa liquids

Dynamical correlations and collective excitations of Yukawa liquids

Exchange and correlation effects on plasmon dispersions and Coulomb drag in low-density electron bilayers

Collective Excitations in Electron-Hole Bilayers

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