We report on anomalous resonance phenomena observed in a two-dimensional electron system on 3He-4He liquid mixtures. The resonance is observed in a Corbino conductivity measurement, in which a magnetic field B is applied prependicular to the electron sheet. We have detected the resonances for 3He concentrations n3 from 0.475% to 10.20%, and at temperatures below 800 mK. The resonance frequency fr is inversely proportional to B. In a preliminary study we found that fr and the resonance amplitude increases when the electron sheet is not parallel to the electrode, and this made the understanding difficult. Here we have made the systematic measurement keeping the parallelism between the electrons and the electrode. We have observed the resonance only at n3 > 0.475%. This fact finally leads us to conclude that adding 3 He atoms to liquid 4He induces the nonuniformity in local electron density, and hence the resonance.
ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)