Quantum fidelity susceptibility in excited state quantum phase transitions: Application to the bending spectra of nonrigid molecules
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Khalouf-Rivera, J., Carvajal, M., & Perez-Bernal, F. (2022). Quantum fidelity susceptibility in excited state quantum phase transitions: application to the bending spectra of nonrigid molecules. SciPost Physics, 12(1), 002. doi:[10.21468/SciPostPhys.12.1.002]
SponsorshipEuropean Commission 872081; Spanish National Research, Development, and Innovation plan (RDI plan) PID2019-104002GB-C21 COOPB20364; Junta de Andalucia European Commission SOMM17/6105/UGR UHU-1262561
We characterize excited state quantum phase transitions in the two dimensional limit of the vibron model with the quantum fidelity susceptibility, comparing the obtained results with the information provided by the participation ratio. As an application, we locate the eigenstate closest to the barrier to linearity and determine the linear or bent character of the different overtones for particular bending modes of six molecular species. We perform a fit and use the optimized eigenvalues and eigenstates in three cases and make use of recently published results for the other three cases.