Abstract
We use equilibrium magnetotunnelling spectroscopy to probe the Fermi surface of a quasi-one-dimensional electron system, providing a direct measurement of the one-dimensional subband energies and wave functions. At low electron densities, we observe a distinct pinning of all subband energies whenever a single subband depopulates, and a smooth reduction in the width of the density distribution with increasingly negative front-gate voltage. By comparison with a theoretical model, we show that these effects are related to the distinctive peaked front-gate voltage dependence of the one-dimensional Fermi energy.
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