Please use this identifier to cite or link to this item: http://dr.iiserpune.ac.in:8080/xmlui/handle/123456789/5345
Title: Symmetry deduction from spectral fluctuations in complex quantum systems
Authors: Tekur, S. Harshini
SANTHANAM, M. S.
Dept. of Physics
Keywords: Physics
2020
2020-NOV-WEEK1
TOC-NOV-2020
Issue Date: Sep-2020
Publisher: American Physical Society
Citation: Physical Review Research, 2(3).
Abstract: The spectral fluctuations of complex quantum systems, in an appropriate limit, are known to be consistent with those obtained from random matrices. However, this relation between the spectral fluctuations of physical systems and random matrices is valid only if the spectra are desymmetrized. This implies that the fluctuation properties of the spectra are affected by the discrete symmetries of the system. In this Rapid Communication, it is shown that in the chaotic limit the fluctuation characteristics and symmetry structure for any arbitrary sequence of measured or computed levels can be inferred from its higher-order spectral statistics without desymmetrization. In particular, we consider a spectrum composed of k > 0 independent level sequences with each sequence having the same level density. The k th order spacing ratio distribution of such a composite spectrum is identical to its nearest-neighbor counterpart with a modified Dyson index k. This is demonstrated for the spectra obtained from random matrices, quantum billiards, spin chains, and experimentally measured nuclear resonances with disparate symmetry features.
URI: http://dr.iiserpune.ac.in:8080/xmlui/handle/123456789/5345
https://doi.org/10.1103/PhysRevResearch.2.032063
ISSN: 2643-1564
Appears in Collections:JOURNAL ARTICLES

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