Quantum criticality of the Lipkin-Meshkov-Glick model in terms of fidelity susceptibility
Quantum criticality of the Lipkin-Meshkov-Glick model in terms of fidelity susceptibility
We study the critical properties of the Lipkin-Meshkov-Glick model in terms of the fidelity susceptibility. By using the Holstein-Primakoff transformation, we obtain explicitly the critical exponent of the fidelity susceptibility around the second-order quantum phase transition point. Our results provide a rare analytic case for the fidelity susceptibility in describing …