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We investigate the relaxation dynamics in a chiral one-dimensional quantumchannel with finite range interactions, driven out of equilibrium by theinjection of high-energy electrons. While the distribution of high-energyelectrons, after dissipation of some of their energy, has been examinedpreviously (arXiv:2108.00685), we study the distribution of charge carriersexcited from the channel's Fermi sea during this process. Utilizing a detectorto measure the energetic imprint in the Fermi sea downstream of the injectionpoint, we discover an initial symmetry in the distribution of excited electronsand holes relative to the Fermi level. However, this symmetry breaks down withstronger interactions and increased propagation distances, attributed to termsof order four and beyond in the interaction. We provide an intuitiveinterpretation of these results in terms of interference between states withdifferent numbers of plasmons in the Fermi sea.

Dynamical breaking of the electron-hole symmetry in non-equilibrium chiral quantum channels