Year: 2023
Type: article
Abstract: We define the concept of Mixed Symmetry Quantum Phase Transition (MSQPT), considering each permutation symmetry sector \mu μ of an identical particles system, as singularities in the properties of the lowest-energy state into each \mu μ when shifting a Hamiltonian control parameter \lambda λ . A three-level Lipkin-Meshkov-Glick (LMG) model is chosen to typify our construction. Firstly, we analyze the finite number N N of particles case, proving the presence of MSQPT precursors. Then, in the thermodynamic limit N\to∞ N → ∞ , we calculate the lowest-energy density inside each sector \mu μ , augmenting the control parameter space by \mu μ , and showing a phase diagram with four different quantum phases.
Source: SciPost Physics Proceedings
Authors: Alberto Mayorgas, J. Guerrero, Manuel Calixto
Institutions: Universidad de Granada, Universidad de Jaén
Language: English
Topic: Quantum many-body systems
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: diamond
OpenAlex ID: W4388971607