Characterizing the Lipkin-Meshkov-Glick excited-state spectrum through the quantum coherence spectrum Wang, Qian Khalouf Rivera, Jamil Pérez Bernal, Francisco Excited-state quantum phase transitions extend the quantum phase transition concept beyond the ground state and offer insights into the complex behavior of quantum systems. In the present work we assess the use of the multiple quantum coherence spectrum as a valid tool to probe excited-state quantum phase transitions within the framework of the Lipkin-Meshkov-Glick model. The time dependence and the long-time average of the multiple quantum coherence spectrum reveal the intricate dynamics that stems from the existence of singularities in the excited-state spectrum of a quantum many-body system. 2025-05-02T12:24:24Z 2025-05-02T12:24:24Z 2025-03-11 journal article Wang, Khalouf-Rivera, and Pérez-Bernal. Phys Rev A. 111. 032209 (2025) [DOI: 10.1103/PhysRevA.111.032209] https://hdl.handle.net/10481/103893 10.1103/PhysRevA.111.032209 eng http://creativecommons.org/licenses/by/4.0/ open access Atribución 4.0 Internacional American Physical Society