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Analysis

This paper explores how dynamic quantum phase transitions (DQPTs) can be induced in a 1D Ising model under periodic driving. It moves beyond sudden quenches, showing DQPTs can be triggered by resonant driving within a phase or by low-frequency driving across the critical point. The findings offer insights into the non-equilibrium dynamics of quantum spin chains.
Reference

DQPTs can be induced in two distinct ways: resonant driving within a phase and low-frequency driving across the critical point.

Analysis

This paper introduces an improved variational method (APP) to analyze the quantum Rabi model, focusing on the physics of quantum phase transitions (QPTs) in the ultra-strong coupling regime. The key innovation is the asymmetric deformation of polarons, which leads to a richer phase diagram and reveals more subtle energy competitions. The APP method improves accuracy and provides insights into the QPT, including the behavior of excited states and its application in quantum metrology.
Reference

The asymmetric deformation of polarons is missing in the current polaron picture... Our APP not only increases the method accuracy but also reveals more underlying physics concerning the QPT.