Abstract
Current echos as a response to a sequence of two ultrashort voltage pulses and their delay dependence are studied for interacting particles. The echo amplitude is reduced compared to its noninteracting counterpart, and decays even without an external bath coupling. However, it ends up with a nonzero value in the large-delay limit. This partial dephasing can be traced back to correlated energy differences in the many-body system. It is expected for all echo phenomena in small isolated systems. The time-dependent Hartree-Fock approximation fails to describe the current echo's dephasing even qualitatively.
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