We have observed unexpected resonance phenomena in two-dimensional electron system formed on the free surface of dilute 3He-4He liquid mixtures (with 3He concentrations up to 21%), in a Corbino conductivity measurement. The resonances are observed only on the mixture surfaces, and were not observed both on pure 4He and pure 3He. The resonance frequency is inversely proportional to the magnetic field applied perpendicular to the electron sheet. This property is quite similar to the characteristics of edge magnetoplasmons (EMPs) or inter-edge magnetoplasmons (IEMPs), although the resonance frequency is much smaller than the ordinary EMPs frequencies. The resonances are altered by tilting the electrodes. These results suggest that the inhomogeneity in the electron density on a macroscopic scale is induced by adding a small amount of 3He into liquid 4He (possibly due to the growth of 3He surface layers), and that the IEMPs propagate at the boundary between two regions with different electron densities.
|ジャーナル||Physica E: Low-Dimensional Systems and Nanostructures|
|出版ステータス||Published - 2004 4 1|
|イベント||15th International Conference on ELectronic Propreties - Nara, Japan|
継続期間: 2003 7 14 → 2003 7 18
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