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arXiv 0903.2597hep-thquant-ph
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具有δ相互作用和微扰双曲势的Dirac方程中的粒子共振

Particle resonance in the Dirac equation in the presence of a delta interaction and a perturbative hyperbolic potential

Victor M. Villalba, Luis A. Gonzalez-Diaz

摘要:

在本文中,我们证明了一维Dirac方程的能谱,在一个有吸引力的矢量δ势的存在下,表现出共振行为时,包括一个渐近空间消失的弱电场与双曲正切势。我们解决了狄拉克方程的高斯超几何函数,并明确显示如何共振行为取决于电场评估的支持点相互作用的强度。我们推导了共振值的近似表达式,并将双曲势的计算结果与线性微扰势的计算结果进行了比较。最后,我们用相移和Wigner延迟时间来表征共振态。

英文摘要:

In the present article we show that the energy spectrum of the one-dimensional Dirac equation, in the presence of an attractive vectorial delta potential, exhibits a resonant behavior when one includes an asymptotically spatially vanishing weak electric field associated with a hyperbolic tangent potential. We solve the Dirac equation in terms of Gauss hyper-geometric functions and show explicitly how the resonant behavior depends on the strength of the electric field evaluated at the support of the point interaction. We derive an approximate expression for the value of the resonances and compare the results calculated for the hyperbolic potential with those obtained for a linear perturbative potential. Finally, we characterize the resonances with the help of the phase shift and the Wigner delay time.

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