Collective Modes in Strongly Coupled Elecronic Bilayer Liquids
  We present the first reliable calculation of the collective mode structure of a strongly coupled electronic bilayer. The calculation is based on a classical model through the $3^{rd}$ frequency-moment-sum-rule preserving Quasi Localized Charge Approximation, using the recently calculated Hypernetted Chain pair correlation functions. The spectrum shows an energy gap at $k=0$ and the absence of a previously conjectured dynamical instability. 
G. Kalman (Dept. of Physics, Boston College, Chestnut Hill, MA), V.   Valtchinov (Dept. of Radiology, Brigham and Women's Ho...