1/28/2015PHY 7r2 Spring 2015 -- Lecture 61 PHY 752 Solid State Physics 11-11:50 AM MWF Olin 107 Plan for Lecture 6: Reading: Chapter 6 in MPM; Electronic.

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1/28/2015PHY 7r2 Spring Lecture 61 PHY 752 Solid State Physics 11-11:50 AM MWF Olin 107 Plan for Lecture 6: Reading: Chapter 6 in MPM; Electronic Structure 1.Independent electron models 2.Free electron gas 3.Densities of states 4.Statistical mechanics of non-interacting electrons

1/28/2015PHY 7r2 Spring Lecture 62

1/28/2015PHY 7r2 Spring Lecture 63

1/28/2015PHY 7r2 Spring Lecture 64 Born-Oppenheimer approximation Born & Huang, Dynamical Theory of Crystal Lattices, Oxford (1954) Electronic coordinates Atomic coordinates Quantum Theory of materials

1/28/2015PHY 7r2 Spring Lecture 65 Quantum Theory of materials -- continued Effective nuclear interaction provided by electrons (Often treated classically)

1/28/2015PHY 7r2 Spring Lecture 66 Terms neglected in Born-Oppenheimer approximation

1/28/2015PHY 7r2 Spring Lecture 67 First consider electronic Hamiltonian Replace by “jellium” Independent electron contributions

1/28/2015PHY 7r2 Spring Lecture 68 Treatment of each electron (Fermi particle) in the jellium model Note: This and following slides taken from Marder’s text

1/28/2015PHY 7r2 Spring Lecture 69 Enumerating the independent electron states by summing over k:

1/28/2015PHY 7r2 Spring Lecture 610 Enumerating the independent electron states by summing over k – continued: Note: Each spatial state has a spin degeneracy of 2.

1/28/2015PHY 7r2 Spring Lecture 611 Enumerating the independent electron states by summing over k – continued for :

1/28/2015PHY 7r2 Spring Lecture 612 Enumerating the independent electron states by summing over k – continued for :

1/28/2015PHY 7r2 Spring Lecture 613 Enumerating the independent electron states by summing over k – continued for :

1/28/2015PHY 7r2 Spring Lecture 614 Note: Previous results are special to a 3-dimensional jellium system where the electronic states are related to the wavevectors according to For your homework problem, you will consider a 2- dimensional jellium system with two different dispersions: E(k)=Xk 2 and E(k)=Xk.

1/28/2015PHY 7r2 Spring Lecture 615 Statistical mechanics of free Fermi gas in terms of “grand” partition function

1/28/2015PHY 7r2 Spring Lecture 616 “Grand” potential

1/28/2015PHY 7r2 Spring Lecture 617

1/28/2015PHY 7r2 Spring Lecture 618

1/28/2015PHY 7r2 Spring Lecture 619 Jellium analysis of some metals

1/28/2015PHY 7r2 Spring Lecture 620 How well does the jellium model work – analysis of electronic contribution to specific heat First consider the following trick:

1/28/2015PHY 7r2 Spring Lecture 621

1/28/2015PHY 7r2 Spring Lecture 622

1/28/2015PHY 7r2 Spring Lecture 623

1/28/2015PHY 7r2 Spring Lecture 624 Specific heat table from Marder’s text: