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Nonlinear Quasi-localized Charge Approximation in a Strongly Coupled Classical Bilayer
이창진,Gabor J. Kalman 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.58 No.3
Within the framework of the quasi-localized charge approximation, the Lagrange’s equation of collective modes in a strongly coupled classical bilayer liquid can be generalized beyond the harmonic approximation into the nonlinear regime up to the quadratic order.
A Rigorous Calculation of the Linear Density Desponse Function in a 2D Electron Gas
이창진 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.6
A detailed analytic calculation of the linear density response function (ㅣDRF)of a two-dimensional electron gas (2DEG) at zero temperature is presented. The formal derivation of the `DRF of a degenerate 2DEG is given not only to extract the naive symmetry of the 2D`DRF in imaginary frequency space but also to emphasize that the two-point density corelation function (DCF) has been modified into an unphysical DCF, which does not stand alone because it can violate the Pauli principle. A rigorous integration of the modified two-point longitudinal DCF has ben performed and its explicit analytic expresion has ben used to reproduce a result identical to that obtained by Stern, which strongly supports the validity of the employed integration technique.