Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
1998-10-06
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
4 pages, 3 figures, submitted to Physical Review Letters
Scientific paper
Microwave frequency conductivity, Re($\sigma_{xx}$), of high quality two-dimensional hole systems (2DHS) in a large perpendicular magnetic field (B) is measured with the carrier density ($n_s$) of the 2DHS controlled by a backgate bias. The high B insulating phase of the 2DHS exhibits a microwave resonance that remains well-defined, but shifts to higher peak frequency ($f_{pk}$) as $n_s$ is reduced. Over a wide range of $n_s, f_{pk} \propto n_s^{-1/2}$ is observed for the two samples we measured. The data clearly indicate that both carrier-carrier interactions and disorder are indispensable in determining the dynamics of the insulator. The $n_s$ dependence of $f_{pk}$ is consistent with a weakly pinned Wigner crystal in which domain size increases with $n_s$, due to larger carrier-carrier interaction.
Engel Lloyd W.
Li Camille
Shahar D.
Shayegan Mansour
Tsui Daniel C.
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