Author

Li-Wei Duan

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Preprint Oct 2026

Fates of Exact Finite-$N$ First-Order Transitions: Coherent Suppression versus Spectral-Collapse Termination

Symmetry-protected ground-state crossings can produce exact first-order transitions (FOTs) even at finite $N$, in contrast to continuous transitions governed by soft-mode criticality. We establish exact Juddian ground-state crossings for arbitrary finite $N$ in the one- and two-photon anisotropic Dicke models and ident...

Jiong Li, Li-Wei Duan, Qing-Hu Chen et al. · 0 citations

Preprint Sep 2026

Excitation Gap of a Confined Chiral Mode Measures Critical Zero-Point Fluctuations

Where uniform and chiral superradiant boundaries meet in a quantum Rabi ring, the quadratic theory leaves a degenerate chiral ladder with finite radial width. We show that adding one chiral quantum widens the ladder's radial wave function; the quartic coupling then raises the uniform quadratic coefficient. The resultin...

Shu He, Li-Wei Duan · 0 citations