General $\delta$-shell interactions for the two-dimensional Dirac operator: self-adjointness and approximation
作者： Vladimir Lotoreichik , Albert Mas , Biagio Cassano , Matěj Tušek
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摘要: In this work we consider the two-dimensional Dirac operator with general local singular interactions supported on a closed curve. A systematic study of interaction is performed by decomposing it into linear combination four elementary interactions: electrostatic, Lorentz scalar, magnetic, and fourth one which can be absorbed using unitary transformations. We address self-adjointness spectral description underlying operator, moreover describe its approximation operators regular potentials.
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