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Groundbreaking New Quantum Well Designs

A new wafer with a wider quantum well than we've used previously has begun providing fantastic new data. Single atom fluctuations in the width of the quantum well broaden TDCS features in energy. With the wider quantum well, these width variations are less important. The new spectra reveal quantum Hall physics in astounding detail, as shown in the data taken at 1 Tesla above (compare with that in our recent Nature paper. At higher fields, we are beginning to understand how the fractional quantum Hall effect reveals itself in the single particle spectrum, while at lower fields we're pinning down the properties of a previously unobserved coupled electron-plasmon excitation.