Coulomb scattering lifetime of a two-dimensional electron gas

Abstract

Motivated by a recent tunneling experiment in a double quantum-well system, which reports an anomalously enhanced electronic scattering rate in a clean two-dimensional electron gas, we calculate the inelastic quasiparticle lifetime due to electron-electron interaction in a single loop dynamically screened Coulomb interaction within the random-phase-approximation. We obtain excellent quantitative agreement with the inelastic scattering rates in the tunneling experiment without any adjustable parameter, finding that the reported large ($\ge$ a factor of six) disagreement between theory and experiment arises from quantitative errors in the existing theoretical work and from the off-shell energy dependence of the electron self-energy.

11 pages, RevTex, figures included. Also available at http://www-cmg.physics.umd.edu/~lzheng/

References in corpus (2)

• Renormalization Group Approach to Interacting Fermions
• Lifetime of Two-Dimensional Electrons Measured by Tunneling Spectroscopy

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