High Magnetic Field Microwave Conductivity of 2D Electrons in an Array of Antidots

Details High Magnetic Field Microwave Conductivity of 2D Electrons in an Array of Antidots High Magnetic Field Microwave Conductivity of 2D Electrons in an Array of Antidots

2001-03-06

arxiv.org/abs/cond-mat/0103127v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 3 figures, revtex4

Scientific paper

10.1103/PhysRevB.65.121305

We measure the high magnetic field ($B$) microwave conductivity, Re$\sigma_{xx}$, of a high mobility 2D electron system containing an antidot array. Re$\sigma_{xx}$ vs frequency ($f$) increases strongly in the regime of the fractional quantum Hall effect series, with Landau filling $1/3<\nu<2/3$. At microwave $f$, Re$\sigma_{xx}$ vs $B$ exhibits a broad peak centered around $\nu=1/2$. On the peak, the 10 GHz Re$\sigma_{xx}$ can exceed its dc-limit value by a factor of 5. This enhanced microwave conductivity is unobservable for temperature $T \gtrsim 0.5$ K, and grows more pronounced as $T$ is decreased. The effect may be due to excitations supported by the antidot edges, but different from the well-known edge magnetoplasmons.

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