6.730 Physics for Solid State Applications
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1 6.730 Physics for Solid State Applications Lecture 25: Chemical Potential and Equilibrium Outline Microstates and Counting System and Reservoir Microstates Constants in Equilibrium Temperature & Chemical Potential Fermions and Bosons April 7, 2004 Microstates and Counting Ensemble of 3 2-level Systems Total Energy # of Microstates E=0 g=1 E=1 g=3 E=2 g=3 E=3 g=1 As we shall see, g is related to the entropy of the 1
2 E=2 Microstates and Counting Ensemble of 4 2-level Systems Total Energy # of Microstates E=0 g=1 E=1 g=4 E=2 g=6 E=3 g=4 E=4 g=1 E=2 Microstates and Counting 300 The larger the s, the stronger the dependence on E Number of Microstates N= N= Total Energy Number of Microstates 30 N=10 20 N=5 10 N= N= Total Energy For most mesoscopic and macroscopic s, g is a monotonically increasing function of E 2
3 System + Reservoir Microstates Gibb s Postulate = all microstates are equally likely Example Consider a of 3 2-levels + a of 10 2-levels Probability of finding: E s = 0 45/78 E s = 1 30/78 E s = 2 3/78 Most electrons are in the ground state so entropy is maximized! Most likely mircostate of S&R System + Reservoir Microstates For sufficiently large s. we only care about the most likely microstate for S+R Now we have a tool to look at equilibrium 3
4 Equilibrium is when we are sitting in this max entropy (g) state is the same for two s in equilibrium We observe that two s in equilibrium have the same temperature, so we hypothesize that This microscopic definition of temperature is a central result of stat. mech. 4
5 Boltzmann Distributions S is the thermodynamic entropy of a Boltzmann observed that and so he hypothesized that Boltzmann Distributions controls distribution (to logarithmic accuracy) use 5
6 Now we allow and to exchange particles as well as energy Entropy of can be expanded for each case Difference in entropy of the two configurations is..where µ is the electrochemical potential 6
7 If ds = 0, that is S is held constant, then So that Chemical potential is change in energy of if one particle is added without changing entropy Electrochemical potential The electrochemical potential, a.k.a, the fermi level is The energy can be divided into two parts if the particle has charge If the electric field is then the change in electrostatic energyis Fermi level or the electrochemical potential the electrochemical potential for an electrically neutral particle 7
8 Example: Fermi-Dirac Statistics Consider that the is a single energy level which can either be occupied: unoccupied: Normalized probability (for fermions) 8
9 Example: Bose-Einstein Statistics Consider that the is a single energy level which can either be occupied with n particles: unoccupied: Average number of particles (for bosons) Two Systems in Equilibrium 1 2 Particles flow from 1 to 2 Particles flow from 2 to 1 In equilibrium 9
10 Summary System which can exchange particles and energy with a General Probability Ratio For Fermions For Bosons Summary System which can exchange only energy with a, General Probability Ratio For Fermions For Bosons Looks as if µ=0, but in reality µ never entered the problem! This is also true if the can exchange particles, but there is no constraint on the total number of particles; for example, with photons and phonons. 10
11 Counting and Fermi Integrals 3-D D Conduction Electron Density Note: the chemical potential Specific Heat of Solid Note: no chemical potential 11
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