A Bi quantum film potential as an inverse problem

Experiments generally only offer access to certain output parameters or spectra. When performing device simulations, we often assume that agreement of theoretical and experimental output means that the model describes the device well. However, this conclusion is by no means mandatory. Here, we show an example of a Bi quantum film where measurements show equidistant energy levels. Though this suggests a harmonic oscillator potential, a variety of alternative potentials with equidistant spectra may also describe the structure, especially considering the finite measurement accuracy and range.