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van Nieuwenburg, Evert P. L.; Liu, Ye-Hua; Huber, Sebastian D.
Nature physics, 05/2017, Volume: 13, Issue: 5Journal Article
Classifying phases of matter is key to our understanding of many problems in physics. For quantum-mechanical systems in particular, the task can be daunting due to the exponentially large Hilbert space. With modern computing power and access to ever-larger data sets, classication problems are now routinely solved using machine-learning techniques1. Here, we propose a neural-network approach to finding phase transitions, based on the performance of a neural network after it is trained with data that are deliberately labelled incorrectly. We demonstrate the success of this method on the topological phase transition in the Kitaev chain2, the thermal phase transition in the classical Ising model3, and the many-body-localization transition in a disordered quantum spin chain4. Our method does not depend on order parameters, knowledge of the topological content of the phases,or any other specics of the transition at hand. It therefore paves the way to the development of a generic tool for identifying unexplored phase transitions.
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