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

P. D. Ye·L. W. Engel·D. C. Tsui·J. A. Simmons·J. R. Wendt·G. A. Vawter·J. L. Reno
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Abstract

We measure the high magnetic field ($B$) microwave conductivity, Re$σ_{xx}$, of a high mobility 2D electron system containing an antidot array. Re$σ_{xx}$ vs frequency ($f$) increases strongly in the regime of the fractional quantum Hall effect series, with Landau filling $1/3<ν<2/3$. At microwave $f$, Re$σ_{xx}$ vs $B$ exhibits a broad peak centered around $ν=1/2$. On the peak, the 10 GHz Re$σ_{xx}$ 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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P. D. Ye, L. W. Engel, D. C. Tsui, J. A. Simmons, J. R. Wendt, G. A. Vawter, J. L. Reno. 2001-03-06. High Magnetic Field Microwave Conductivity of 2D Electrons in an Array of Antidots. https://doi.org/10.1103/physrevb.65.121305

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