TY - JOUR

T1 - Effect of electron-electron interaction and plasmon excitation on the density-of-states for a two-dimensional electron liquid

AU - Gumbs, Godfrey

AU - Kogan, Eugene

PY - 2007/10

Y1 - 2007/10

N2 - We calculate the Green's function for an interacting two-dimensional electron liquid whose strength of interaction is characterized by the electron density parameter rs. The screened electron-electron interaction is expressed in terms of a frequency and wave vector-dependent dielectric function ε(q, ω). If this screening is neglected, the tunneling density of states (DOS) is strongly modified by the electron-electron interaction. This modification is seen as a dip near the Fermi energy. This dip becomes deeper and narrower as rs is increased. When screening is included, the DOS is considerably affected by the collective plasma excitations. In particular, the range of frequencies where the plasmon excitations contribute increases with rs. Also, the DOS near the Fermi energy for the screened electron liquid depends on the electron density. We treat ε(q, ω) in the hydrodynamical approximation in order to investigate the way in which the tunneling DOS is modified at various electron densities.

AB - We calculate the Green's function for an interacting two-dimensional electron liquid whose strength of interaction is characterized by the electron density parameter rs. The screened electron-electron interaction is expressed in terms of a frequency and wave vector-dependent dielectric function ε(q, ω). If this screening is neglected, the tunneling density of states (DOS) is strongly modified by the electron-electron interaction. This modification is seen as a dip near the Fermi energy. This dip becomes deeper and narrower as rs is increased. When screening is included, the DOS is considerably affected by the collective plasma excitations. In particular, the range of frequencies where the plasmon excitations contribute increases with rs. Also, the DOS near the Fermi energy for the screened electron liquid depends on the electron density. We treat ε(q, ω) in the hydrodynamical approximation in order to investigate the way in which the tunneling DOS is modified at various electron densities.

UR - http://www.scopus.com/inward/record.url?scp=35349008652&partnerID=8YFLogxK

U2 - 10.1002/pssb.200743170

DO - 10.1002/pssb.200743170

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AN - SCOPUS:35349008652

SN - 0370-1972

VL - 244

SP - 3695

EP - 3702

JO - Physica Status Solidi (B): Basic Research

JF - Physica Status Solidi (B): Basic Research

IS - 10

ER -