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Statistical Mechanics

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Statistical Mechanics 

Prof. Fausto Borgonovi

COURSE AIMS

Basics Tools of Classical and Quantum Equilibrium Statistical Mechanics,

Phase Transitions and Stochastic Processes. At the end of the course, students should be able to handle  statistical tools in modern physics. 

COURSE CONTENTS

1) The Statistical Basis of Thermodynamics : Macroscopic and microscopic states. The classical  ideal gas. Entropy of Mixing and Gibbs paradox. Correct Boltzman Counting. Phase space. Liouville  Theorem. Microcanonical Ensemble. The Canonical Ensemble. Partition Function. Energy Fluctuations  and equivalence  between microcanonical and canonical ensembles. Oscillator Gas. Langevin 

paramagnetism. The Grand Canonical Ensemble.

2) Quantum Statistics : Density Matrix. Statistics of various ensembles. Systems of indistinguishable  particles. Partition function of a system of free particles.

3) Quantum Gases :  The Ideal gas. Ideal Bose Systems. Bose­Einstein condensation. The specific heat  of a solid, Einstein and Debye models.  Ideal Fermi Systems. Pauli paramagnetism. Landau levels. 

Landau diamagnetism. Flux Quantization. Van Halphen­ De Haas Effect.

4) Phase Transitions : Classification. I and II order transitions. Ferromagnetic Transition. 

Phenomenology of Ferromagnetism. Heisenberg Model. Ising Model in 1D and 2D. Mean Field  Approximation. Correlation Functions. Fluctuation­Response Theorem. Critical Exponents. Scaling  Hypothesis, Scaling Law.

5) Stochastic Processes : 

 

LangevinEquation and fluctuation­dissipation theorem. Time Correlation  Functions. Brownian motion and Einstein Relation. Brownian motion in a oscillator bath. Lioville and  Fokker­Planck Equations. Master equation. Optical  Absooption Coefficient.

READING LIST

1. R.K.Pathria, Statistical Mechanics, Elsevier Science (1996) 2. K. Huang, Statistical Mechanics, J. Wiley & sons, (USA).

3. J.J.Binney ­ N.J.Dowrick – A.J.Fisher and   M.E.J.Newman, The Theory of Critical Phenomena,  Oxford Science Publications, Oxford 1992.

4. R.ZWANZIG, Non equilibrium Statistical Mechanics, Oxford Univ. Press (2001) TEACHING METHOD

Lectures. Homework exercises.

COURSE ASSESSMENT Written and oral.

NOTES

Students are required to have a good knowledge of Thermodynamics, Classical and Quantum  Mechanics.  Prof. Borgonovi receives students after lectures. Students may also write to: 

fausto.borgonovi@unicatt.it  or fborgonovi@gmail.com

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