The hydrodynamic theory of dynamical correlation functions in the XX chain
The hydrodynamic theory of dynamical correlation functions in the XX chain
复制标题
XX链中动态相关函数的流体动力学理论
DOI:
10.1088/1742-5468/ac6667
复制
发表时间:
2022
期刊:
影响因子:
--
通讯作者:
Del Vecchio Del Vecchio G
中科院分区:
文献类型:
--
作者:
Del Vecchio Del Vecchio G
By the hydrodynamic linear response theory, dynamical correlation functions decay as power laws along certain velocities, determined by the flux Jacobian. Such correlations are obtained by hydrodynamic projections, and physically, they are due to propagating'sound waves' or generalisation thereof, transporting conserved quantities between the observables. However, some observables do not emit sound waves, such as order parameters associated to symmetry breaking. In these cases correlation functions decay exponentially everywhere, a behaviour not captured by the hydrodynamic linear response theory. Focussing on spin–spin correlation functions in the XX quantum chain, we first review how hydrodynamic linear response works, emphasising that the necessary fluid cell averaging washes out oscillatory effects. We then show how, beyond linear response, Euler hydrodynamics can still predict the exponential decay of correlation functions of order parameters. This is done by accounting for the large-scale fluctuations of domain walls, via the recently developed ballistic fluctuation theory. We use the framework of generalised hydrodynamics, which is particularly simple in this model due to its free fermion description. In particular, this reproduces, by elementary calculations, the exponential decay in the celebrated formulae by Its et al (1993) and by Jie (1998), which were originally obtained by intricate Fredholm determinant analysis; and gives a new formula in a parameter domain where no result was obtained before. We confirm the results by numerical simulations.
登录
查看更多内容
DOI:
10.1016/0550-3213(78)90499-6
发表时间:
1978
期刊:
Nuclear Physics
影响因子:
--
作者:
B. Schroer;T. T. Truong
通讯作者:
T. T. Truong
DOI:
10.1088/0305-4470/33/16/301
发表时间:
2000-04-28
期刊:
JOURNAL OF PHYSICS A-MATHEMATICAL AND GENERAL
影响因子:
--
作者:
Derzhko, O;Krokhmalskii, T;Stolze, J
通讯作者:
Stolze, J
影响因子:
0.7
作者:
W. Ledermann
通讯作者:
W. Ledermann
影响因子:
1
作者:
F. Colomo;A. Izergin;V. Korepin;V. Tognetti
通讯作者:
V. Tognetti
DOI:
10.1088/1742-5468/2016/03/033104
发表时间:
2015
期刊:
Journal of Statistical Mechanics: Theory and Experiment
影响因子:
--
作者:
D. Bernard;B. Doyon
通讯作者:
B. Doyon