Off-diagonal observable elements from random matrix theory: distributions, fluctuations, and eigenstate thermalization
Off-diagonal observable elements from random matrix theory: distributions, fluctuations, and eigenstate thermalization
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随机矩阵理论中的非对角可观察元素:分布、波动和本征态热化
DOI:
10.1088/1367-2630/aae28f
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发表时间:
2018
影响因子:
3.3
通讯作者:
Nation C
中科院分区:
文献类型:
--
作者:
Nation C
We derive the eigenstate thermalization hypothesis(ETH)from a random matrix Hamiltonian by extending the model introduced by Deutsch (1991 Phys. Rev. A 43 2046). We approximate the coupling between a subsystem and a many-body environment by means of a random Gaussian matrix. We show that a common assumption in the analysis of quantum chaotic systems, namely the treatment of eigenstates as independent random vectors, leads to inconsistent results. However, a consistent approach to the ETH can be developed by introducing an interaction between random wave-functions that arises as a result of the orthonormality condition. This approach leads to a consistent form for off-diagonal matrix elements of observables. From there we obtain the scaling of time-averaged fluctuations of generic observables with system size for which we calculate an analytic form in terms of the inverse participation ratio. The analytic results are compared to exact diagonalizations of a quantum spin chain for different physical observables in multiple parameter regimes.
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DOI:
10.1103/physrevc.54.1665
发表时间:
1996
期刊:
Physical review. C, Nuclear physics
影响因子:
--
作者:
N. Frazier;B. Brown;V. Zelevinsky
通讯作者:
V. Zelevinsky
DOI:
--
发表时间:
1984
期刊:
影响因子:
--
作者:
P. Pechukas
通讯作者:
P. Pechukas
影响因子:
8.6
作者:
Clos, Govinda;Porras, Diego;Schaetz, Tobias
通讯作者:
Schaetz, Tobias
影响因子:
8.6
作者:
R. Steinigeweg;Abdelah Khodja;Hendrik Niemeyer;C. Gogolin;J. Gemmer
通讯作者:
R. Steinigeweg;Abdelah Khodja;Hendrik Niemeyer;C. Gogolin;J. Gemmer
DOI:
10.1103/physreve.88.052114
发表时间:
2013
期刊:
Physical review. E, Statistical, nonlinear, and soft matter physics
影响因子:
--
作者:
P. Reimann;M. Evstigneev
通讯作者:
M. Evstigneev