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Realizing Discontinuous Wave Functions with Renormalized Short-Range Potentials

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arxiv quant-ph/9709035 v4 pith:RCRO6YHR submitted 1997-09-17 quant-ph chao-dynnlin.CDnucl-th

Realizing Discontinuous Wave Functions with Renormalized Short-Range Potentials

classification quant-ph chao-dynnlin.CDnucl-th
keywords deltawavediscontinuityfunctionfunctionsboundarydiracneumann
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It is shown that a potential consisting of three Dirac's delta functions on the line with disappearing distances can give rise to the discontinuity in wave functions with the proper renormalization of the delta function strength. This can be used as a building block, along with the usual Dirac's delta, to construct the most general three-parameter family of point interactions, which allow both discontinuity and asymmetry of the wave function, as the zero-size limit of self-adjoint local operators in one-dimensional quantum mechanics. Experimental realization of the Neumann boundary is discussed. KEYWORDS: point interaction, self-adjoint extension, $\delta'$ potential, wave function discontinuity, Neumann boundary PACS Nos: 3.65.-w, 11.10.Gh, 68.65+g

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