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The microreversibility principle implies that the conductance of atwo-terminal Aharonov-Bohm interferometer is an even function of the appliedmagnetic flux. Away from linear response, however, this symmetry is notfulfilled and the conductance phase of the interferometer when a quantum dot isinserted in one of its arms can be a continuous function of the bias voltage.Such magnetoasymmetries have been investigated in related mesoscopic systemsand arise as a consequence of the asymetric response of the internal potentialof the conductor out of equilibrium. Here we discuss magnetoasymmetries inquantum-dot Aharonov-Bohm interferometers when strong electron-electroninteractions are taken into account beyond the mean-field approach. We findthat at very low temperatures the asymmetric element of the differentialconductance shows an abrupt change for voltages around the Fermi level. Athigher temperatures we recover a smooth variation of the magnetoasymmetry as afunction of the bias. We illustrate our results with the aid of the electronoccupation at the dot, demonstrating that its nonequilibrium component is anasymmetric function of the flux even to lowest order in voltage. We alsocalculate the magnetoasymmetry of the current-current correlations (the noise)and find that it is given, to a good extent, by the magnetoasymmetry of theweakly nonlinear conductance term. Therefore, both magnetoasymmetries (noiseand conductance) are related to each other via a higher-orderfluctuation-dissipation relation. This result appears to be true even in thelow temperature regime, where Kondo physics and many-body effects dominate thetransport properties.

Magnetoasymmetric transport in a mesoscopic interferometer: From the weak to the strong coupling regime