Zeros in single-channel transmission through double quantum dots.

摘要: By using a simple model we consider single-channel transmission through double quantum dot that consists of two single dots coupled by wire finite length L. Each the is characterized few energy levels only, and assumed to have only one level whose depends on The described 5 matrix theory effective non-Hermitian Hamilton operator Heff system. decay widths eigenstates depend strongly energy. explains origin zeros considered us. Mostly, they are caused (destructive) interferences between neighboring first order. When, however, both identical their order, those second First-order cause phase jumps amplitude p, while there no related second-order zeros. In this latter case, jump occurs due fact width states vanishes when crossing zero. parameter dependence resonance determined spectral properties dots. ©2005 American Physical Society.