Characterizing the Lipkin-Meshkov-Glick excited-state spectrum through the quantum coherence spectrum
Year: 2025
Type: article
Abstract: 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.
Source: Physical Review A
Authors: Qian Wang, Jamil Khalouf-Rivera, Francisco Pérez-Bernal
Language: English
Topic: Quantum many-body systems
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $2,675
Funders: European Commission, National Natural Science Foundation of China, Ministerio de Economía y Competitividad, Javna Agencija za Raziskovalno Dejavnost RS, Universidad de Huelva, European Regional Development Fund, Agencia Estatal de Investigación, Natural Science Foundation of Zhejiang Province, Ministerio de Universidades
Awards: G1175115578, G2262748287, G2601397997, G2780805008, G300979063, G3147169747, G333115606, G3480869486, G3681454997, G3840904103, G387506447, G4042783231, G410571670, G425668148, G451917667, G5051449751, G5080475149, G529233282, G5303835005, G5967599077, Applied mathematics, theoretical physics and intelligent systems, G6177934523, G669504810, G7175263899, G7597869325, Quantum localization in few and many-body chaotic systems, G910521360
OpenAlex ID: W4297644932