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Properties of bound states of the Schrödinger equation with attractive Dirac delta potentials

Ersan Demiralp1,2 and Haluk Beker1

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We have studied bound states of the Schrödinger equation for an attractive potential with any finite number (P) of Dirac delta-functions in Rn where n = 1, 2, 3, .... The potential is radially symmetric for n ≥ 2 and is given as V(r) = −hbar2/2mPi = 1 σiδ(rri) where σi > 0, r1 < r2 < ⋯ < rP, and ri in (0, +) for n ≥ 2, ri in (−, +) for n = 1. By separating angular degrees of freedom, the radial equation is obtained for n ≥ 2 and applications of the boundary conditions lead to P transfer matrices which are used to form an equation for the eigenvalues. We have proven that, for given n and l, the bound state solutions of the radial equation are non-degenerate and there are at most P bound state solutions of the radial equation and hence P bound state energy levels for a potential with P attractive Dirac delta-functions. Given l and n ≥ 2, for P = 1, we have shown that there exists one and only one solution of the radial equation if σ1 r1 > 2l + n − 2 and none otherwise. We have also proven that there are at most P positive roots for the equation X22(k) = 0 where X = (X11X21X12X22) = MPMP−1 ... M1 and Mi in SL(2, R) are the particular transfer matrices mentioned above.


PACS

03.65.Ge Solutions of wave equations: bound states

MSC

81Q05 Closed and approximate solutions to the Schrödinger, Dirac, Klein-Gordon and other quantum-mechanical equations

81Q10 Selfadjoint operator theory in quantum theory, including spectral analysis

Subjects

Quantum information and quantum mechanics

Dates

Issue 26 (4 July 2003)

Received 19 February 2003, in final form 25 April 2003

Published 18 June 2003



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