Figure 3From: A similarity of quantum phase transition and quench dynamics in the Dicke model beyond the thermodynamic limit(a) Excitation energy ϵ of the Dicke Hamiltonian as a function of the coupling strength for different number of qubits in the limit \(\varOmega/w_{0}\gg1\). (b) Coupling strength versus N at the critical point. We set \(\varOmega=100w_{0}\). The vanishing of ϵ at the critical point \(g=1\) indicates the appearance of the QPTBack to article page