Effects of scarring on quantum chaos in disordered quantum wells
(2019) In Journal of Physics Condensed Matter 31(10).- Abstract
The suppression of chaos in quantum reality is evident in quantum scars, i.e. in enhanced probability densities along classical periodic orbits. They provide opportunities in controlling quantum transport in nanoscale quantum systems. Here, we study energy level statistics of perturbed two-dimensional quantum systems exhibiting recently discovered, strong perturbation-induced quantum scarring. In particular, we focus on the effect of local perturbations and an external magnetic field on both the eigenvalue statistics and scarring. Energy spectra are analyzed to investigate the chaoticity of the quantum system in the context of the Bohigas-Giannoni-Schmidt conjecture. We find that in systems where strong perturbation-induced scars are... (More)
The suppression of chaos in quantum reality is evident in quantum scars, i.e. in enhanced probability densities along classical periodic orbits. They provide opportunities in controlling quantum transport in nanoscale quantum systems. Here, we study energy level statistics of perturbed two-dimensional quantum systems exhibiting recently discovered, strong perturbation-induced quantum scarring. In particular, we focus on the effect of local perturbations and an external magnetic field on both the eigenvalue statistics and scarring. Energy spectra are analyzed to investigate the chaoticity of the quantum system in the context of the Bohigas-Giannoni-Schmidt conjecture. We find that in systems where strong perturbation-induced scars are present, the eigenvalue statistics are mostly mixed, i.e. between Wigner-Dyson and Poisson pictures in random matrix theory. However, we report interesting sensitivity of both the eigenvalue statistics to the perturbation strength, and analyze the physical mechanisms behind this effect.
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- author
- Keski-Rahkonen, J. ; Luukko, P. J.J. ; Åberg, S. LU and Räsänen, E.
- organization
- publishing date
- 2019-01-21
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- disorder, energy-level statistics, quantum chaos, quantum scar, quantum well
- in
- Journal of Physics Condensed Matter
- volume
- 31
- issue
- 10
- article number
- 105301
- publisher
- IOP Publishing
- external identifiers
-
- scopus:85060385998
- pmid:30566927
- ISSN
- 0953-8984
- DOI
- 10.1088/1361-648X/aaf9fb
- language
- English
- LU publication?
- yes
- id
- c2d2e255-25d5-43d4-a4e7-c8d999e968df
- date added to LUP
- 2022-03-30 11:01:28
- date last changed
- 2024-03-29 01:54:20
@article{c2d2e255-25d5-43d4-a4e7-c8d999e968df,
abstract = {{<p>The suppression of chaos in quantum reality is evident in quantum scars, i.e. in enhanced probability densities along classical periodic orbits. They provide opportunities in controlling quantum transport in nanoscale quantum systems. Here, we study energy level statistics of perturbed two-dimensional quantum systems exhibiting recently discovered, strong perturbation-induced quantum scarring. In particular, we focus on the effect of local perturbations and an external magnetic field on both the eigenvalue statistics and scarring. Energy spectra are analyzed to investigate the chaoticity of the quantum system in the context of the Bohigas-Giannoni-Schmidt conjecture. We find that in systems where strong perturbation-induced scars are present, the eigenvalue statistics are mostly mixed, i.e. between Wigner-Dyson and Poisson pictures in random matrix theory. However, we report interesting sensitivity of both the eigenvalue statistics to the perturbation strength, and analyze the physical mechanisms behind this effect.</p>}},
author = {{Keski-Rahkonen, J. and Luukko, P. J.J. and Åberg, S. and Räsänen, E.}},
issn = {{0953-8984}},
keywords = {{disorder; energy-level statistics; quantum chaos; quantum scar; quantum well}},
language = {{eng}},
month = {{01}},
number = {{10}},
publisher = {{IOP Publishing}},
series = {{Journal of Physics Condensed Matter}},
title = {{Effects of scarring on quantum chaos in disordered quantum wells}},
url = {{http://dx.doi.org/10.1088/1361-648X/aaf9fb}},
doi = {{10.1088/1361-648X/aaf9fb}},
volume = {{31}},
year = {{2019}},
}