Abstract
The self-energy of a layered two-dimensional (2D) electron gas has been investigated using the Fermi-liquid approach. The zero- and finite-temperature calculations including both single-particle and plasmon excitations have been carried out. It is found that when the interlayer distance is large compared to twice the effective Bohr radius a B , the interlayer-coupling effects are small and the results correspond to those of a pure 2D electron gas. When the interlayer distance is smaller than 2a B , the results are similar to those of a three-dimensional (3D) system. At intermediate interlayer distances, the results show an interesting mixture of 2D and 3D behaviors
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