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• W4386302017 abstract "This paper introduces complex dynamics methods to study dynamical quantum phase transitions in the one- and two-dimensional quantum 3-state Potts model. The quench involves switching off an infinite transverse field. The time-dependent Loschmidt echo is evaluated by an exact renormalization group (RG) transformation in the complex plane where the thermal Boltzmann factor is along the positive real axis, and the quantum time evolution is along the unit circle. One of the characteristics of the complex dynamics constituted by repeated applications of RG is the Julia set, which determines the phase transitions. We show that special boundary conditions can alter the nature of the transitions, and verify the claim for the one-dimensional system by transfer matrix calculations. In two dimensions, there are alternating symmetry-breaking and restoring transitions, both of which are first-order, despite the criticality of the Curie point. In addition, there are finer structures because of the fractal nature of the Julia set. Our approach can be extended to multi-variable problems, higher dimensions, and approximate RG transformations expressed as rational functions." @default.
• W4386302017 created "2023-08-31" @default.
• W4386302017 creator A5016342313 @default.
• W4386302017 date "2023-08-28" @default.
• W4386302017 modified "2023-10-16" @default.
• W4386302017 title "Complex dynamics approach to dynamical quantum phase transitions: the Potts model" @default.
• W4386302017 doi "https://doi.org/10.48550/arxiv.2308.14827" @default.
• W4386302017 hasPublicationYear "2023" @default.
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