期刊
JOURNAL OF PHYSICS-CONDENSED MATTER
卷 27, 期 20, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0953-8984/27/20/205601
关键词
generalized fidelity susceptibility; quantum phase transition; dynamical structure factor
资金
- National Science Foundation of China (NSFC) [11474211]
- Natural Science Foundation of Jiangsu Province of China [BK20141190]
In the present work, we investigate the intrinsic relation between quantum fidelity susceptibility (QFS) and the dynamical structure factor. We give a concise proof of the QFS beyond the perturbation theory. With the QFS in the Lehmann representation, we point out that the QFS is actually the negative-two-power moment of dynamical structure factor and illuminate the inherent relation between physical quantities in the linear response theory. Moreover, we discuss the generalized fidelity susceptibility (GFS) of any quantum relevant operator, that may not be coupled to the driving parameter, and present similar scaling behaviors. Finally, we demonstrate that the QFS cannot capture the fourth-order quantum phase transition in a spin-1/2 anisotropic XY chain in the transverse alternating field, while a lower-order GFS can seize the criticalities.
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