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We investigate single-electron transport through quantum dots with negativecharging energy induced by a polaronic energy shift. For weak dot-lead tunnelcouplings, we demonstrate a bipolaronic blockade effect at low biases whichsuppresses the oscillating linear conductance, while the conductance resonancesunder large biases are enhanced. Novel conductance plateau develops when thecoupling asymmetry is introduced, with its height and width tuned by thecoupling strength and external magnetic field. It is further shown that theamplitude ratio of magnetic-split conductance peaks changes from 3 to 1forincreasing coupling asymmetry. Though we demonstrate all these transportphenomena in the low-order single-electron tunneling regime, they are alreadystrikingly different from the usual Coulomb blockade physics and are easy toobserve experimentally.

Bipolaronic blockade effect in quantum dots with negative charging energy