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We show that a weak non-resonant tunneling between two quantum wires leads tosplitting of the acoustic plasmon mode at finite wavevector. Two gaps open upin the dipersion of the acoustic plasmon mode when its frequency is close tothe frequencies of the quasiparticle excitations. In contrast to the Laudaudamping of the collective excitations, these gaps are attributed to tunnelingassisted acoustic plasmon-quasiparticle excitation resonances. We predict thatsuch a resonance can be observed in inelastic light scattering spectrum.Comment: 3 pages, 4 Postscript figure

Tunneling-assisted acoustic-plasmon–quasiparticle excitation resonances in coupled quasi-one-dimensional electron gases