Key Methods and Concepts in Condensed Matter Physics

Green’s functions and real space renormalization group

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Naturwissenschaften, Medizin, Informatik, Technik / Naturwissenschaften allgemein


This book aims to present a concise introduction, for graduate students and researchers, to powerful techniques and important concepts in condensed matter physics. Key conceptual elements include the fluctuation–dissipation theorem, the theory of critical phenomena (both classical and quantum) and the renormalization group. The book focuses on the Green’s functions method and the real space renormalization group (RG).  

 The Green’s function method has been used extensively to study a large variety of problems in physics. In the book we present a generalized version of this method that allows one to use perturbation theory including time dependent perturbations. This can be used to treat a variety of new fundamental problems in condensed matter, such as quantum and topological phase transitions.  

The real space renormalization group is a highly intuitive method to introduce main concepts in statistical mechanics and the theory of phase transitions. The book discusses the notion of scale invariance, stable and unstable fixed points, flow in parameter space, crossover and relevant and irrelevant perturbations. These will be illustrated with several examples. The book illustrates that the real space RG is very useful for treating problems such as percolation and localized magnetism as described, for example, by the Ising model.

The book considers problems in both pure and disordered condensed matter systems and discusses the new effects introduced by the latter.  

 The book presents the solutions of some fundamental problems in condensed matter physics using the methods and tools introduced in the chapters. The calculations will be carried out with step-by-step details to help readers master the techniques.

 Finally, the book explores how the Green’s functions and real space RG techniques detailed can be used to study modern problems arising from the consideration of topological aspects of condensed matter.  

Key Features:

  • Provides a generalization of the Green’s function method that allows for the treatment of a much larger variety of problems, which should encourage people to study and use it.
  • Suitable for readers who want to learn about real space renormalization group (RG), whilst avoiding Feynman diagrams and perturbation expansions. The ideas and methods will be introduced by considering different examples.
  • Contains material that can be covered within a semester and is therefore not too long.
  • Provides the reader with the tools to tackle their own problems.
  • Considers actual problems in condensed matter physics such as; quantum phase transition, topological aspects of condensed matter and the effect of disorder on physical properties.

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Condensed Matter Physics, Greens Functions, Real Space Renormalization Group, Renormalization, Perturbation Theory, Quantum Phase Transitions, Topological Phase Transitions