Anomalous mechanisms of the loss of observability in non-Hermitian quantum models

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F62690094%3A18470%2F20%3A50017036" target="_blank" >RIV/62690094:18470/20:50017036 - isvavai.cz</a>
Alternative codes found
RIV/61389005:_____/20:00531626
Result on the web
<a href="https://www.sciencedirect.com/science/article/pii/S0550321320301504?via%3Dihub" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0550321320301504?via%3Dihub</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.nuclphysb.2020.115064" target="_blank" >10.1016/j.nuclphysb.2020.115064</a>

Result language
angličtina
Original language name
Anomalous mechanisms of the loss of observability in non-Hermitian quantum models
Original language description
Via several toy-model quantum Hamiltonians H (lambda) of a non-tridiagonal low-dimensional matrix form the existence of unusual observability horizons is revealed. At the corresponding limiting values of parameter lambda = lambda((critical)) these new types of quantum phase transitions are interpreted as the points of confluence of several decoupled Kato's exceptional points of equal or different orders. Such a phenomenon of degeneracy of non-Hermitian degeneracies seems to ask for a reclassification of the possible topologies of the complex energy Riemann surfaces in the vicinity of branch points. (C) 2020 The Author(s). Published by Elsevier B.V.
Czech name
—
Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10303 - Particles and field physics

Project
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Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

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

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