5 papers · 1 filter
Generalized One-Dimensional Point Interaction in Relativistic and Non-relativistic Quantum Mechanics
T. Shigehara, H. Mizoguchi, T. Mishima +1
We first give the solution for the local approximation of a four parameter family of generalized one-dimensional point interactions within the framework of non-relativistic model w…
Realization of a Four Parameter Family of Generalized One-Dimensional Contact Interactions by Three Nearby Delta Potentials with Renormalized Strengths
T. Shigehara, H. Mizoguchi, T. Mishima +1
We propose a new method to construct a four parameter family of quantum-mechanical point interactions in one dimension, which is known as all possible self-adjoint extensions of th…
Influence of Small Impurities on Low-Energy Electron Dynamics in Two-Dimensional Microscopic Bounded Region
T. Shigehara, M. Yokoyama, H. Mizoguchi +2
In order to give some insight into a role of small impurities on the electron motion in microscopic devices, we examine from a general viewpoint, the effect of small obstacles on a…
Chaos Induced by Quantization
Takaomi Shigehara, Hiroshi Mizoguchi, Taketoshi Mishima +1
In this paper, we show that two-dimensional billiards with point interactions inside exhibit a chaotic nature in the microscopic world, although their classical counterpart is non-…
Spectral Properties of the Two-Dimensional Laplacian with a Finite Number of Point Interactions
T. Shigehara, H. Mizoguchi, T. Mishima +1
We discuss spectral properties of the Laplacian with multiple () point interactions in two-dimensional bounded regions. A mathematically sound formulation for the problem is giv…