2009 年 78 巻 12 号 p. 124004
We examine scattering properties of singular vertex of degree n=2 and 3, taking advantage of a new form of representing the vertex boundary condition, which has been devised to approximate a singular vertex with finite potentials. We show that proper identification of δ and δ′ components in the connection condition between outgoing lines enables the designing of quantum spectral branch-filters.
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