Dynamical Kohn Anomaly in Surface Acoustic Wave Response in Quantum Hall Systems Near $ν= 1/2$

Details Dynamical Kohn Anomaly in Surface Acoustic Wave Response in Quantum Hall Systems Near $ν= 1/2$ Dynamical Kohn Anomaly in Surface Acoustic Wave Response in Quantum Hall Systems Near $ν= 1/2$

1998-07-23

arxiv.org/abs/cond-mat/9807319v4

Phys. Rev. B 60, 002864 (1999) (5 pages)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 2 figures, the published version

Scientific paper

10.1103/PhysRevB.60.2864

The dynamical analog of the Kohn Anomaly image of the Fermi Surface is
demonstrated for the response functions to the surface acoustic waves in
Quantum Hall Systems near $\nu = 1/2$. Kinks appear in the velocity shift
$Delta s/s$ and attenuation coefficient $\Gamma$. The effect is considerably
enhanced under periodic modulation and should be observable.

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