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Excited-state quantum phase transitions and the entropy of the work distribution in the anharmonic Lipkin-Meshkov-Glick model [Elektronski vir]Zhang, Haiting ...Studying the implications and characterizations of the excited-state quantum phase transitions (ESQPTs) would enable us to understand various phenomena observed in quantum many-body systems. In this ... work, we delve into the affects and characterizations of the ESQPTs in the anharmonic Lipkin-Meshkov-Glick (LMG) model by means of the entropy of the quantum work distribution. The entropy of the work distribution measures the complexity of the work distribution and behaves as a valuable tool for analyzing nonequilibrium work statistics. We show that the entropy of the work distribution captures salient signatures of the underlying ESQPTs in the model. In particular, a detailed analysis of the scaling behavior of the entropy verifies that it not only acts as a witness of the ESQPTs but also reveals the difference between different types of ESQPTs. We further demonstrate that the work distribution entropy also behaves as a powerful tool for understanding the features and differences of ESQPTs in the energy space. Our results provide further evidence of the usefulness of the entropy of the work distribution for investigating various phase transitions in quantum many-body systems and open up a promising way for experimentally exploring the signatures of ESQPTs.Source: Physical review. E. [Elektronski vir]. - ISSN 2470-0053 (Vol. 109, iss. 6, 4. jun. 2024, str. 1-10)Type of material - e-article ; adult, seriousPublish date - 2024Language - englishCOBISS.SI-ID - 198313987
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Zhang, Haiting | ![]() |
Qian, Yifan | ![]() |
Niu, Zhen-Xia | ![]() |
Wang, Qian, matematik, fizik | 53155 |
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