Ground state of electron gases at negative compressibility

Article

关键词: METAL-INSULATOR-TRANSITION;    2-DIMENSIONAL ELECTRON;    2 DIMENSIONS;    LIQUIDS;    B=0;    PHASE;   

DOI  :  10.1103/PhysRevB.64.245101

来源: SCIE

【 摘 要 】

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 wave vector 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.

【 授权许可】

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