Exploration for quantum transport properties of strongly correlated two-dimensional electron gas in ZnO related heterostructures

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In this research, electron-electron interaction in two-dimensional electron gas in MgZnO/ZnO heterostructures was investigated with applying field-effect gating technique. The heterostructures were grown by molecular-beam epitaxy, whose mobility is now reaching to 800,000cm2V-1s-1. With using cyclotron resonance method, we conclude that the enhancement of the effective mass and g-factor of 2D electrons originates from electron-electron interaction. In addition, a new gating technique with air-gapped structure was applied to MgZnO/ZnO samples, enabling us to reduce 2DEG density with keeping high electron mobility.