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The quantum Ising chain for beginners

given by Giuseppe Santoro

Program

I will present various techniques to work with quantum Ising chains. Starting from the Jordan-Wigner transformation, which maps spin-1/2 systems into fermionic ones, we will review some of the basic approaches to deal with the superconducting correlations that naturally emerge in this context. A few problems illustrating important aspects of the physics of this model will provide simple applications of the techniques.

More in detail, the course will consist of:

• A crach course in scientific programming with python and with jupyter notebooks
• The Jordan-Wigner transformation applied to one-dimensional spin-1/2 models
• Free-fermion models (Ising/XY)
• Translationally invariant and disordered Nambu formalism
• Time-dependent Bogoljubov-de Gennes equations and calculation of dynamical quantities
• Calculating thermal averages
• Calculating correlation functions involving Jordan-Wigner strings
• Calculating the entanglement entropy 

The course will be strongly ``hands-on based'': collaborating in small groups, we should eventually construct a python library to calculate many properties of Ising spin chains.

Online resources

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