Duality Between the Weak and Strong Interaction Limits for Randomly Interacting Fermions
Philippe Jacquod, Imre Varga
Abstract
We establish the existence of a duality transformation for generic models of interacting fermions with two-body interactions. The eigenstates at weak and strong interaction U possess similar statistical properties when expressed in the U=0 and U=infinity eigenstates bases respectively. This implies the existence of a duality point Ud where the eigenstates have the same spreading in both bases. Ud is surrounded by an interval of finite width which is characterized by a non Lorentzian spreading of the strength function in both bases. Scaling arguments predict the survival of this intermediate regime as the number of particles is increased.
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