Exact zeros of fidelity in finite-size systems as a signature for probing quantum phase transitions
Exact zeros of fidelity in finite-size systems as a signature for probing quantum phase transitions
The fidelity is widely used to detect quantum phase transitions, which is characterized by either a sharp change of fidelity or the divergence of fidelity susceptibility in the thermodynamical limit when the phase-driving parameter is across the transition point. In this work, we unveil that the occurrence of exact zeros …