Resonant multilead point-contact tunneling: Boundary state formulation

Abstract

In this paper, we study a model of resonant multilead point-contact tunneling by using the boundary state formulation. At a critical point, the model is described by multiflavor chiral fermions on an infinite line with a point contact interaction at the origin. By applying the folding procedure, previously developed for the model of resonant point-contact tunneling of a single lead, we map the model onto a nonchiral fermion model defined on the half line. The resonant point-contact tunneling interaction is transcribed into a nonlocal effective boundary interaction in the folded setup, where the boundary state formulation is applicable. We construct the boundary states for the models with two and three leads explicitly and evaluate the correlation functions of currents operators exactly. The electron transport between the leads is dominated by the resonant point-contact tunneling in the low frequency regime. We observe some [Formula: see text] and [Formula: see text] group theoretical structures, which may be useful to analyze more complex models.