Though there is lot of good text books on condensed matter physics. But there are many good lecture note available by various people. Here i will list some of them . These are mainly on the subject of strongly correlated eletrons. 1. "Quantum Magnetism Approaches to Strongly Correlated Electrons" by Assa Auerbach ( http://arxiv.org/abs/cond-mat/9801294v1 ) 2. "Theory of Superconductivity" by N. B. Kopnin ( https://ltl.tkk.fi/wiki/images/8/8f/TheorySC10.pdf ) 3. "SISSA Lecture notes on Numerical methods for strongly correlated electrons" by Sandro Sorella and Federico Becca ( http://people.sissa.it/~sorella/Simulazioni.pdf ) 4. "Quantum Theory of Condensed Matter" by John Chalker ( http://www-thphys.physics.ox.ac.uk/people/JohnChalker/qtcm/lecture-notes.pdf ) 5. "Quantum Condensed Matter Physics - Lecture Notes" by Chetan Nayak ( http://www.physics.ucla.edu/~nayak/many_body.pdf )