Interacting Electrons And Quantum Magnetism Book

	Preface
1	Electron Interactions in Solids	3
2	Spin Exchange	11
3	The Hubbard Model and Its Descendants	21
4	Ground States of the Hubbard Model	39
5	Ground States of the Heisenberg Model	51
6	Disorder in Low Dimensions	61
7	Spin Representations	69
8	Variational Wave Functions and Parent Hamiltonians	79
9	From Ground States to Excitations	93
10	The Spin Path Integral	101
11	Spin Wave Theory	113
12	The Continuum Approximation	129
13	Nonlinear Sigma Model: Weak Coupling	139
14	The Nonlinear Sigma Model: Large N	153
15	Quantum Antiferromagnets: Continuum Results	159
16	SU(N) Heisenberg Models	165
17	The Large N Expansion	175
18	Schwinger Bosons Mean Field Theory	187
19	The Semiclassical Theory of the t - J Model	205
	Appendix A: Second Quantization	225
	Appendix B: Linear Response and Generating Functionals	231
	Appendix C: Bose and Fermi Coherent States	237
	Appendix D: Coherent State Path Integrals	241
	Appendix E: The Method of Steepest Descents	249
	Index	253