Lecture 12

Lecture 12 - David K. Ferry Regents Professor Arizona State...

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EEE 434 Quantum Mechanics http://www.eas.asu.edu/~ferry/EEE434.htm L12:1 EEE 434/591—Quantum Mechanics David K. Ferry Regents’ Professor Arizona State University MIT Lincoln Laboratory
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EEE 434 Quantum Mechanics http://www.eas.asu.edu/~ferry/EEE434.htm L12:2 Tunneling Devices Now that we have developed the WKB approximation to the tunneling probability we can return to a discussion of the tunneling devices and can calculate the shape of the current-voltage characteristic. There are primarily two tunneling devices we need to consider: 1. The resonant tunneling diode, and 2. The heavily degenerate p-n junction where tunneling can occur; the Esaki diode
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EEE 434 Quantum Mechanics http://www.eas.asu.edu/~ferry/EEE434.htm L12:3 Tunneling Devices p-n junction tunnel diode Resonant tunneling diode Heavily doped p-n junction developed by Leo Esaki Shared Nobel prize for tunneling Conceived by Esaki at IBM Made practical by group at Lincoln Laboratory E F GaAs AlGaAs
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EEE 434 Quantum Mechanics http://www.eas.asu.edu/~ferry/EEE434.htm L12:4 E F Forward bias: V I
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EEE 434 Quantum Mechanics http://www.eas.asu.edu/~ferry/EEE434.htm L12:5 GaAs AlGaAs E F V I Resonant Tunneling Diode
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EEE 434 Quantum Mechanics http://www.eas.asu.edu/~ferry/EEE434.htm L12:6 E F,R E F,L eV a Filled states k k 1 The momentum on the two sides (in the z -direction) is given by and the velocity is related via
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Lecture 12 - David K. Ferry Regents Professor Arizona State...

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