We have investigated the effect of many-body correlations on properties of coupled electron-hole quantum wires using a Singwi-Tosi-Land-Sjo¨lander approach. At rs54 the acoustic collective mode traverses the single-electron excitation region as a narrow resonance peak and reemerges in the undamped region on the high-q side of the excitation region. The acoustic collective mode, but not the optic mode, is sensitive to the separation between the wires. For rs.2.5 the effective interaction acting between the electrons which is mediated by the heavier holes becomes attractive when the separation between the wires drops to a critical value. For 0.8<rs<2.5 we detect a charge-density-wave ground state for small wire separations.
Coupled electron and hole quantum wires
NEILSON, DAVID
1997-01-01
Abstract
We have investigated the effect of many-body correlations on properties of coupled electron-hole quantum wires using a Singwi-Tosi-Land-Sjo¨lander approach. At rs54 the acoustic collective mode traverses the single-electron excitation region as a narrow resonance peak and reemerges in the undamped region on the high-q side of the excitation region. The acoustic collective mode, but not the optic mode, is sensitive to the separation between the wires. For rs.2.5 the effective interaction acting between the electrons which is mediated by the heavier holes becomes attractive when the separation between the wires drops to a critical value. For 0.8I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
