Localized plasmons in point contacts

Details Localized plasmons in point contacts Localized plasmons in point contacts

1998-07-26

arxiv.org/abs/cond-mat/9807342v1

Semicond. Sci. Technol. vol 13, A30-A32 (1998)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages (Latex) including 1 postscript figure

Scientific paper

Using a hydrodynamic model of the electron fluid in a point contact geometry we show that localized plasmons are likely to exist near the constriction. We attempt to relate these plasmons with the recent experimental observation of deviations of the quantum point contact conductance from ideal integer quantization. As a function of temperature this deviation exhibits an activated behavior, exp(-T_a/T), with a density dependent activation temperature T_a of the order of 2 K. We suggest that T_a can be identified with the energy needed to excite localized plasmons, and we discuss the conductance deviations in terms of a simple theoretical model involving quasiparticle lifetime broadening due to coupling to the localized plasmons.

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