Abstract
The influence of the 2D electron-ion system on the crystal surface, regarding that it neutralizes the polarization of the crystal which promotes polarization reversal, is discussed. In some region of polarization the 2D electron (or ion) system constructs the electron (or ion) lattice system, which modulates the structure of the polarization background. The origin and the period of the incommensurate (IC) state can be explained by the relation D 2 P s = e ( D is the electron lattice constant and P s is the spontaneous polarization). Various vibration modes of the electron-hole lattice is discussed. It is considered that the electron-phonon coupling in the 2D electron-hole lattice is important in microwave dispersion and light scattering. The role of the layered 2D electron-hole system in a high- T c superconductor is also speculated.
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