Full text loading...
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.
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 .)
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.
Parameters used in numerical calculations correspond to InSb.
Article metrics loading...