Quantum Tunneling. Free Wave Packet Tunneling through a Barrier Tunneling over a Well Example: Tunneling Microscope Tunnel Transistor a -particle decay. Quantum Tunneling. Postulates Maybe in lab. Quantum Tunneling. Time Dependent Wave Equation.
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Free Wave Packet
Tunneling through a Barrier
Tunneling over a Well
Example: Tunneling Microscope
Maybe in lab
Time Dependent Wave Equation
What is the assumption Junior?
Free Wave Packet in One Dimension
For one-dimension we have
Recall we make up a wave packet using Fourier analysis.
E < U0
Potential Step Barrier
Potential Barrier E < U0
Solving these four equations
Wave Packet Impinging on A Step
For E > U0
Ammonia NH3 MASER
Quantum Tunneling (Esaki) Diode
A tunnel diode or Esaki diode is a type of semiconductor diode which is capable of very fast operation, well into the microwave frequency region, by using quantum mechanical effects.
Quantum Tunneling Transistor
Will replace MOPSET’s
ECE Headline News
High-speed signal mixer demonstrates capabilities of transistor laser
By James E. Kloeppel, U of I News BureauMarch 26, 2009
Single electron transistor (SET)
Scattering: Potential Well E > U0
Lets guess the wavefunction!
Lets look at the simulation.
Is this a homework problem?
What if the potential is ?
…. called the finite square well.
A great Java tunneling simulation
Have file phet tunneling????
Also has good tunneling simulations