Long-wavelength instability in a double-electron-quantum-wire structure

Abstract

We investigate theoretically the possibility of finding a charge-density-wave (CDW) instability in a zero-temperature double-electron-quantum-wire structure. Intrawire and interwire correlations are treated on the same footing within the self-consistent-field approximation of Singwi and co-workers. To check for the CDW instability, the static density susceptibility is calculated over a wide range of wire parameters (electron number density, wire size, and wire spacing). We find that the double-quantum-wire structure may become unstable against a long-wavelength CDW instability for sufficiently low electron density and narrow wire size, in the close proximity of two wires.