Abstract
The density functional theory was used to calculate the energy of a quasi-two-dimensional electron-hole liquid (EHL) in Si/Si1-xGex/Si quantum wells. We have performed a numerical solution of the three one-dimensional nonlinear Schrödinger equations for electrons, heavy and light holes. It is shown that EHL contains heavy and light holes for small x. With an increase in x, a transition to a state with one type of hole occurs, and the density of electron-hole pairs decreases by more than three times. The results of the calculations are in good agreement with the experimental results.
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