Rotation-time symmetry in bosonic systems and the existence of exceptional points in the absence of PT symmetry

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989592%3A15310%2F20%3A73603917" target="_blank" >RIV/61989592:15310/20:73603917 - isvavai.cz</a>
Result on the web
<a href="https://www.nature.com/articles/s41598-020-76787-8.pdf" target="_blank" >https://www.nature.com/articles/s41598-020-76787-8.pdf</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1038/s41598-020-76787-8" target="_blank" >10.1038/s41598-020-76787-8</a>

Result language
angličtina
Original language name
Rotation-time symmetry in bosonic systems and the existence of exceptional points in the absence of PT symmetry
Original language description
We study symmetries of open bosonic systems in the presence of laser pumping. Non-Hermitian Hamiltonians describing these systems can be parity-time (PT) symmetric in special cases only. Systems exhibiting this symmetry are characterised by real-valued energy spectra and can display exceptional points, where a symmetry-breaking transition occurs. We demonstrate that there is a more general type of symmetry, i.e., rotation-time (RT) symmetry. We observe that RT-symmetric non-Hermitian Hamiltonians exhibit real-valued energy spectra which can be made singular by symmetry breaking. To calculate the spectra of the studied bosonic non-diagonalisable Hamiltonians we apply diagonalisation methods based on bosonic algebra. Finally, we list a versatile set rules allowing to immediately identifying or constructing RT-symmetric Hamiltonians. We believe that our results on the RT-symmetric class of bosonic systems and their spectral singularities can lead to new applications inspired by those of the PT-symmetric systems.
Czech name
—
Czech description
—

Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
—
OECD FORD branch
10306 - Optics (including laser optics and quantum optics)

Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2020
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Similar results(10)