Meabh Irene Allen

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Measuring universal data in the strongly correlated regime of quantum critical points remains a fundamental objective in quantum many-body physics. In equilibrium, the universal physics of second order quantum phase transitions appears through diverging length scales, power-law correlations and critical exponents. However, quantum simulators access critical systems out of equilibrium rather than through perfect critical ground state preparation, but these non-equilibrium protocols are not just a practical compromise: they can probe novel quantum dynamical critical phenomena. In this talk, I will give an overview of several dynamical routes for extracting equilibrium critical data, before focusing on quenches in quantum critical spin models. The main example will be recent work on shallow quenches in critical spin chains, showing how universal scaling can be extracted from experimentally accessible initial states such as ground states and finite-temperature ensembles.

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Berkeley
0.03
Contact: Karim Chahine