"Quantum scattering"의 두 판 사이의 차이

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* ID :  [https://www.wikidata.org/wiki/Q2381860 Q2381860]

2020년 12월 28일 (월) 05:55 판

introduction


time independent Schrodinger equation

\[E \psi = -\frac{\hbar^2}{2m}{\partial^2 \psi \over \partial x^2} + V(x)\psi\]

  • simplified form

\[-\varphi_{xx}+u(x)\varphi = \lambda\varphi\] \[\varphi_{xx}+(\lambda-u(x))\varphi=0\]


continuous spectrum

  • \(e^{−ikx}\) is incoming wave from the right to the left
  • \(e^{ikx}\) represents a wave traveling to the right
  • reflection and transmission coefficient
    • \(\varphi \sim e^{-ikx}+\rho(k,t)e^{ikx}\) as \(x\to +\infty\)
    • \(\varphi \sim \tau(k,t)e^{-ikx}\) as \(x\to -\infty\)
  • \(\rho(k,t)\) and \(\tau(k,t)\) are called the reflection and transmission coefficient


potential scattering

\(r=t-1\)

If t is of the form \(t=\frac{1}{1-ai}\) (real number a), then

\(|r|^2+|t|^2=1\)



delta potential example



harmonic oscillator



sech potential example


related items


expositions


encyclopedia

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