| Texto completo | |
| Autor(es): |
Squillante, Lucas
;
Ricco, Luciano S.
;
Ukpong, Aniekan Magnus
;
Lagos-Monaco, Roberto E.
;
Seridonio, Antonio C.
;
de Souza, Mariano
Número total de Autores: 6
|
| Tipo de documento: | Artigo Científico |
| Fonte: | PHYSICAL REVIEW B; v. 108, n. 14, p. 5-pg., 2023-10-06. |
| Resumo | |
The Gruneisen ratio Gamma, i.e., the singular part of the ratio of thermal expansion to the specific heat, has been broadly employed to explore both finite T and quantum critical points (QCPs). For a genuine quantum phase transition (QPT), thermal fluctuations are absent and thus the thermodynamic Gamma cannot be employed. We propose a quantum analog to Gamma that computes entanglement as a function of a tuning parameter lambda and show that QPTs take place only for systems in which the ground-state energy depends on lambda nonlinearly. Furthermore, we demonstrate the breakdown of the Hellmann-Feynman theorem in the thermodynamic limit at any QCP. We showcase our approach using the quantum one-dimensional Ising model with a transverse field and Kane's quantum computer. The slowing down of the dynamics and thus the "creation of mass" close to any QCP/QPT is also discussed. (AU) | |
| Processo FAPESP: | 11/22050-4 - Investigação das propriedades termodinâmicas e de transporte de sistemas eletrônicos fortemente correlacionados |
| Beneficiário: | Valdeci Pereira Mariano de Souza |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |