Name: Anonymous 2010-01-17 8:42
We have the following potential:
V\left (x\right ) = \frac{\hbar^2}{2m}\left [g_1\delta\left (x+a\right )+g_2\delta\left (x-a\right )\right ]
Assume a particle with an energy E > 0 comes from the left: determine the transmission coefficient.
How should I start with this? I solved the Schrödinger equation in the three regions, which gives me the following solution for the wave equation:
\psi\left (x\right )= \left\{
\begin{array}{l l}
Ae^{-ik\left (x+a\right )} + Be^{ik\left (x+a\right )} & \quad \text{for } -\infty < x \leq -a\\
Ce^{-ik\left (x-a\right )} + De^{ik\left (x-a\right )} & \quad \text{for } -a < x \leq a\\
Fe^{ik\left (x-a\right )} & \quad \text{for } a < x < \infty\\
\end{array}
This is where I'm stuck. I can't apply the rules for continuity in the derivatives of the wave function, because the potential goes to \infty at -a and a. Any ideas?
V\left (x\right ) = \frac{\hbar^2}{2m}\left [g_1\delta\left (x+a\right )+g_2\delta\left (x-a\right )\right ]
Assume a particle with an energy E > 0 comes from the left: determine the transmission coefficient.
How should I start with this? I solved the Schrödinger equation in the three regions, which gives me the following solution for the wave equation:
\psi\left (x\right )= \left\{
\begin{array}{l l}
Ae^{-ik\left (x+a\right )} + Be^{ik\left (x+a\right )} & \quad \text{for } -\infty < x \leq -a\\
Ce^{-ik\left (x-a\right )} + De^{ik\left (x-a\right )} & \quad \text{for } -a < x \leq a\\
Fe^{ik\left (x-a\right )} & \quad \text{for } a < x < \infty\\
\end{array}
This is where I'm stuck. I can't apply the rules for continuity in the derivatives of the wave function, because the potential goes to \infty at -a and a. Any ideas?