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Quantum tunneling dominates coherent transport at low temperatures in manysystems of great interest. In this work we report a many--body tunneling (MBT),by nonperturbatively solving the Anderson multi-impurity model, and identify ita fundamental tunneling process on top of the well--acknowledged sequentialtunneling and cotunneling. We show that the MBT involves the dynamics ofdoublons in strongly correlated systems. Proportional to the numbers ofdynamical doublons, the MBT can dominate the off--resonant transport in thestrongly correlated regime. A $T^{3/2}$--dependence of the MBT current ontemperature is uncovered and can be identified as a fingerprint of the MBT inexperiments. We also prove that the MBT can support the coherent long--rangetunneling of doublons, which is well consistent with recent experiments onultracold atoms. As a fundamental physical process, the MBT is expected to playimportant roles in general quantum systems.

Many-body Tunneling and Nonequilibrium Dynamics of Doublons in Strongly Correlated Quantum Dots