Single-electron excitations and interactions in integer quantum Hall systems at ? = 2

We study the interplay between few-electron excitations generated by voltage pulses and interactions in a quantum Hall system at integer filling factor ? = 2. Electron-electron interactions strongly affect the dynamics of the generated pulses, leading to their fractionalization. In particular, on the innermost edge channel two oppositely charged excitations emerge, which we analyze through their Wigner function. Moreover, we show that interactions provide a signature in the noise generated when these excitations are partitioned by a quantum point contact connecting opposite edges. We compare different shapes of the external drive and we discuss the most convenient in order to extract information about the so-called mixing angle, encoding the strength of interactions between edge channels. © 2019 Published under licence by IOP Publishing Ltd.