  In this study, we propose the concept of harnessing quantum coherence to
control electron transport in a many-body system. Combining an open quantum
system technique based on Hubbard operators, we show that many-body coherence
can eliminate the well-known Coulomb staircase and cause strong negative
differential resistance. To explore the mechanism, we analytically derive the
current-coherence relationship in the zero electron-phonon coupling limit.
Furthermore, by incorporating a gate field, we demonstrate the possibility of
constructing a coherence-controlled transistor. This development opens up a new
direction for exploring quantum electronic devices based on many-body
coherence.
