# Exotic signature of dynamical quantum phase transition in the time evolution of an engineered initial state

@article{Bhattacharyya2020ExoticSO, title={Exotic signature of dynamical quantum phase transition in the time evolution of an engineered initial state}, author={Sirshendu Bhattacharyya and Subinay Dasgupta}, journal={Journal of Physics A}, year={2020}, volume={53}, pages={265002} }

Dynamical phase transition in quantum many body systems is usually studied by taking it in the ground state and then quenching a parameter to a new value. We investigate here the dynamics when one performs the time evolution of a generic state and observe that the rate function related to the Loschmidt echo shows non-analytic behavior of two types, one related, and the other unrelated, to the appearance of a quantum phase transition. Specifically, we consider a quantum Ising chain in an initial…

## 3 Citations

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The existence of distinct phases and unconventional singularity of dynamical free energy, whose signature can be accessed through quasilocal operators are demonstrated using a stroboscopic Ising model.

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We explore both pure and mixed states Floquet dynamical quantum phase transitions (FDQFTs) in the one-dimensional p-wave superconductor with a time-driven pairing phase. In the Fourier space, the…

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We investigate both pure and mixed states Floquet dynamical quantum phase transition (DQPT) in the periodically time-dependent extended XY model. We exactly show that the proposed Floquet Hamiltonian…

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