COUPLED ELECTRON AND HOLE QUANTUM WIRES

We have investigated the effect of many-body correlations on propertie s of coupled electron-hole quantum wires using a Singwi-Tosi-Land-Sjol ander approach. At r(s)=4 the acoustic collective made traverses the s ingle-electron excitation region as a narrow resonance peak and reemer ges in the undamped region on the high-q side of the excitation region . The acoustic collective mode, but not the optic mode, is sensitive t o the separation between the wires, For r(s)>2.5 the effective interac tion acting between the electrons which is mediated by the heavier hol es becomes attractive when the separation between the wires drops to a critical value. For 0.8 less than or equal to r(s) less than or equal to 2.5 we detect a charge-density-wave ground state for small wire se parations.