On the Ground State of Electron Gases at Negative Compressibility

Details On the Ground State of Electron Gases at Negative Compressibility On the Ground State of Electron Gases at Negative Compressibility

2001-03-26

arxiv.org/abs/cond-mat/0103524v2

Phys. Rev. B 64, 245101 (2001)

Physics

Condensed Matter

6 double-column pages, 2 figures. 2nd version is an extension of the 1st one, giving more details

Scientific paper

10.1103/PhysRevB.64.245101

Two- and three-dimensional electron gases with a uniform neutralizing background are studied at negative compressibility. Parametrized expressions for the dielectric function are used to access this strong-coupling regime, where the screened Coulomb potential becomes overall attractive for like charges. Closely examining these expressions reveals that the ground state with a periodic modulation of the charge density, albeit exponentially damped, replaces the homogeneous one at positive compressibility. The wavevector characterizing the new ground state depends on the density and is complex, having a positive imaginary part, as does the homogeneous ground state, and real part, as does the genuine charge density wave.

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