https://doi.org/10.1140/epjb/s10051-021-00245-1
Regular Article - Statistical and Nonlinear Physics
Fidelity-mediated analysis of the transverse-field XY chain with the long-range interactions: anisotropy-driven multi-criticality
Department of Physics, Faculty of Science, Okayama University, 700-8530, Okayama, Japan
a
nisiyama@science.okayama-u.ac.jp
Received:
30
July
2021
Accepted:
9
November
2021
Published online:
19
November
2021
The transverse-field XY chain with the long-range interactions was investigated by means of the exact-diagonalization method. The algebraic decay rate of the long-range interaction is related to the effective dimensionality
, which governs the criticality of the transverse-field-driven phase transition at
. According to the large-N analysis, the phase boundary
exhibits a reentrant behavior within
, as the XY-anisotropy
changes. On the one hand, as for the
and
short-range XY magnets, the singularities have been determined as
and 0, respectively, and the transient behavior around
remains unclear. As a preliminary survey, setting
, we investigate the phase transition by the agency of the fidelity, which seems to detect the singularity at
rather sensitively. Thereby, under the setting
(
), we cast the fidelity data into the crossover-scaling formula with the properly scaled
, aiming to determine the multi-criticality around
. Our result indicates that the multi-criticality is identical to that of the
magnet, and
’s linearity might be retained down to
.
© The Author(s), under exclusive licence to EDP Sciences, SIF and Springer-Verlag GmbH Germany, part of Springer Nature 2021