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Terahertz instability of optical phonons interacting with plasmons in two-dimensional electron channels
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10.1063/1.3479416
/content/aip/journal/apl/97/6/10.1063/1.3479416
http://aip.metastore.ingenta.com/content/aip/journal/apl/97/6/10.1063/1.3479416

Figures

Image of FIG. 1.
FIG. 1.

A 2D electron channel is surrounded by a diatomic material supporting optical phonons. Interaction between the electrons drifting in the channel and the optical phonons can lead to a THz instability.

Image of FIG. 2.
FIG. 2.

The dispersion curves of the drifting 2D plasmons cross the dispersion curves of the optical phonons leading to strong interaction between them. (The wave number is normalized to the lattice constant .)

Image of FIG. 3.
FIG. 3.

Interaction between the drifting 2D plasmons and the optical phonons is unstable as indicated by on the dispersion diagrams (b), (d), and (f). The instability is stronger for lower drift velocities, compare (a) and (b) with (c) and (d), and for higher electron densities, compare (c) and (d) with (e) and (f). For all parameters, the instability is the strongest near the longitudinal optical-phonon frequency.

Tables

Generic image for table
Table I.

Parameters used in numerical calculations correspond to InSb.

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/content/aip/journal/apl/97/6/10.1063/1.3479416
2010-08-11
2014-04-19
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Terahertz instability of optical phonons interacting with plasmons in two-dimensional electron channels
http://aip.metastore.ingenta.com/content/aip/journal/apl/97/6/10.1063/1.3479416
10.1063/1.3479416
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