hw06sol - Introduction to Quantum and Statistical Mechanics...

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Unformatted text preview: Introduction to Quantum and Statistical Mechanics Homework 6 Solution Prob. 6.1 For an infinite-wall with a small step potential defined as: ( 29 = L x L x d V d x x x V We would like to look at the formalism to find the ground-state energy E . Assume that E > V . (a) Set up the eigenfunctions for 0 x d and d x L , respectively. (10 pts) ( 29 = L x L x d x k B d x x k A x x sin sin 2 1 where 2 1 2 F mE k = and ( 29 2 2 2 F V E m k- = (b) Derive the transcendental equation setup which can give the solution for the quantized ground energy E . No analytical solution for the transcendental equation needed. (10 pts) Matching the boundary condition at d and L for both and d /dx and cancelling out A and B by division, we obtain: ( 29 ( 29 ( 29 d k V E L d k E 1 2 tan tan- =- Prob. 6.2 For the simple harmonic oscillator described by the Hamiltonian: ) ( ) ( 2 1 ) ( 2 2 2 2 2 2 x E x x m x dx d m = +- (a) If the particle is at the ground state, use the direct integration to find...
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This note was uploaded on 10/25/2009 for the course ECE 4060 at Cornell University (Engineering School).

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hw06sol - Introduction to Quantum and Statistical Mechanics...

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