Many-body correlations probed by plasmon-enhanced drag measurements in   double quantum well structures
  Electron drag measurements of electron-electron scattering rates performed close to the Fermi temperature are reported. While evidence of an enhancement due to plasmons, as was recently predicted [K. Flensberg and B. Y.-K. Hu, Phys. Rev. Lett. 73, 3572 (1994)], is found, important differences with the random-phase approximation based calculations are observed. Although static correlation effects likely account for part of this difference, it is argued that correlation-induced multiparticle excitations must be included to account for the magnitude of the rates and observed density dependences. 
H. Noh (1), S. Zelakiewicz (1), X. G. Feng (1), T. J. Gramila (1), L.   N. Pfeiffer (2) and K. W. West (2) ((1) Penn State U...