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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
; | | Date: |
6 Mar 2001 | | Subject: | Mesoscopic Systems and Quantum Hall Effect | cond-mat.mes-hall | | Abstract: | 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 $1/3<
u<2/3$. At microwave $f$, Re$sigma_{xx}$ vs $B$ exhibits a broad peak centered around $
u=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. | | Source: | arXiv, cond-mat/0103127 | | Services: | Forum | Review | PDF | Favorites | |
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