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Real-Time Decoherence of Landau and Levitov Quasiparticles in Quantum Hall Edge Channels

2014; American Physical Society; Volume: 113; Issue: 16 Linguagem: Inglês

10.1103/physrevlett.113.166403

1092-0145

Dario Ferraro, Benjamin Roussel, Clément Cabart, É. Thibierge, Gwendal Fève, Ch. Grenier, Pascal Degiovanni,

Molecular Junctions and Nanostructures

Quantum Hall edge channels at integer filling factor provide a unique test bench to understand the decoherence and relaxation of single-electron excitations in a ballistic quantum conductor. In this Letter, we obtain a full visualization of the decoherence scenario of energy (Landau)- and time (Levitov)-resolved single-electron excitations at filling factor $\ensuremath{\nu}=2$. We show that the Landau excitation exhibits a fast relaxation followed by spin-charge separation whereas the Levitov excitation only experiences spin-charge separation. We finally suggest to use Hong-Ou-Mandel-type experiments to probe specific signatures of these different scenarios.