Coalescence of two branch points in complex time marks the end of rapid adiabatic passage and the start of Rabi oscillations

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389021%3A_____%2F22%3A00559105" target="_blank" >RIV/61389021:_____/22:00559105 - isvavai.cz</a>
Alternative codes found
RIV/68378271:_____/22:00559105
Result on the web
<a href="https://doi.org/10.1088/1751-8121/ac76f7" target="_blank" >https://doi.org/10.1088/1751-8121/ac76f7</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1088/1751-8121/ac76f7" target="_blank" >10.1088/1751-8121/ac76f7</a>

Result language
angličtina
Original language name
Coalescence of two branch points in complex time marks the end of rapid adiabatic passage and the start of Rabi oscillations
Original language description
We study theoretically the population transfer in two-level atoms driven by chirped lasers. It is known that in the Hermitian case, the rapid adiabatic passage (RAP) is stable for an above-critical chirp below which the final populations of states Rabi oscillate with varying laser power. We show that if the excited state is represented by a resonance, the separatrix marking this critical phenomenon in the space of the laser pulse parameters emanates from an exceptional point (EP). This critical phenomenon is neatly understood via extending the 'slow' time variable into the complex plane, uncovering a set of branch points which encode non-adiabatic dynamics, where the switch between RAP and Rabi oscillations is triggered by a coalescence of two such branch points. We assert that the intriguing interrelation between the two different singularities - the EP and the branch point coalescence in complex time plane - can motivate feasible experiments involving laser driven atoms.n
Czech name
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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
10301 - Atomic, molecular and chemical physics (physics of atoms and molecules including collision, interaction with radiation, magnetic resonances, Mössbauer effect)

Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year
2022
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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