Plasmons in coupled bilayer structures

Details Plasmons in coupled bilayer structures Plasmons in coupled bilayer structures

1998-10-27

arxiv.org/abs/cond-mat/9810374v1

Phys. Rev. Lett. 81, 4216 (1998)

Physics

Condensed Matter

Strongly Correlated Electrons

10 pages, 6 figures. to appear in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.81.4216

We calculate the collective charge density excitation dispersion and spectral weight in bilayer semiconductor structures {\it including effects of interlayer tunneling}. The out-of-phase plasmon mode (the ``acoustic'' plasmon) develops a long wavelength gap in the presence of tunneling with the gap being proportional to the square root (linear power) of the tunneling amplitude in the weak (strong) tunneling limit. The in-phase plasmon mode is qualitatively unaffected by tunneling. The predicted plasmon gap should be a useful tool for studying many-body effects.

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