Using renormalization group techniques, we study spectral and transport properties of a spinless interacting quantum dot consisting of two levels coupled to metallic reservoirs. For strong Coulomb repulsion U and an applied Aharonov-Bohm phase φ, we find a large direct tunnel splitting |Δ|~(Γ/π)|cos(φ/2)|ln(U/ωc) between the levels of the order of the level broadening Γ. As a consequence we discover a many-body resonance in the spectral density that can be measured via the absorption power. Furthermore, for φ=π, we show that the system can be tuned into an effective Anderson model with spin-dependent tunneling.
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Boese et al. (2001) studied this question.