Pöschl-Teller波导中的二维Dirac粒子
Two-dimensional Dirac particles in a Pöschl-Teller waveguide
摘要：
我们得到了二维Dirac方程在一维Pöschl-Teller势下的精确解。本征函数用Heun合流函数表示，而本征值通过一个简单的超越方程的解来确定。对于对称情形，将超临界态的本征函数表示为球波函数，并得到了相应本征值的近似解析表达式。得到了任意平方可积对称势保持零能量束缚态所需的最小势强度的普适条件。讨论了光滑电子波导在二维Dirac-Weyl系统中的应用。
英文摘要：
We obtain exact solutions to the two-dimensional (2D) Dirac equation for the one-dimensional Pöschl-Teller potential which contains an asymmetry term. The eigenfunctions are expressed in terms of Heun confluent functions, while the eigenvalues are determined via the solutions of a simple transcendental equation. For the symmetric case, the eigenfunctions of the supercritical states are expressed as spheroidal wave functions, and approximate analytical expressions are obtained for the corresponding eigenvalues. A universal condition for any square integrable symmetric potential is obtained for the minimum strength of the potential required to hold a bound state of zero energy. Applications for smooth electron waveguides in 2D Dirac-Weyl systems are discussed.
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