What are the methods for calculating quantum phase transition?

In summary, a quantum phase transition is a sudden change in the physical properties of a material that occurs due to a rearrangement of its quantum states, rather than a change in temperature or pressure. This sets it apart from classical phase transitions, which are driven by changes in temperature or pressure. Examples of quantum phase transitions include changes in superconducting states, magnetic phases, and states of matter in ultracold atomic gases. These transitions are studied using experimental techniques and theoretical calculations, and have potential applications in fields such as quantum computing and understanding extreme conditions of matter.
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nik9039
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Trying to understand what the math methods are exist to determine quantum phase transition and how I can calculate it, by what methods.
 
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I don't know what you are talking about and what the meaning of your diagram is. Do you have a concrete physical problem in mind? Asking a clearly defined question is usually more than half way to a solution!
 
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