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Helium in chirped laser fields as a time-asymmetric atomic switch
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SYSNO ASEP 0434945 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Helium in chirped laser fields as a time-asymmetric atomic switch Author(s) Kaprálová-Žďánská, Petra Ruth (UFCH-W) RID
Moiseyev, N. (IL)Source Title Journal of Chemical Physics. - : AIP Publishing - ISSN 0021-9606
Roč. 141, č. 1 (2014), s. 014307Number of pages 14 s. Language eng - English Country US - United States Keywords Atom lasers ; Laser pulses ; Helium Subject RIV CF - Physical ; Theoretical Chemistry R&D Projects GAP205/11/0571 GA ČR - Czech Science Foundation (CSF) Institutional support UFCH-W - RVO:61388955 UT WOS 000339622000019 EID SCOPUS 84903978149 DOI 10.1063/1.4885136 Annotation Tuning the laser parameters exceptional points in the spectrum of the dressed laser helium atom are obtained. The weak linearly polarized laser couples the ground state and the doubly excited P-states of helium. We show here that for specific chirped laser pulses that encircle an exceptional point one can get the time-asymmetric phenomenon, where for a negative chirped laser pulse the ground state is transformed into the doubly excited auto-ionization state, while for a positive chirped laser pulse the resonance state is not populated and the neutral helium atoms remains in the ground state as the laser pulse is turned off. Moreover, we show that the results are very sensitive to the closed contour we choose. This time-asymmetric state exchange phenomenon can be considered as a time-asymmetric atomic switch. The optimal time-asymmetric switch is obtained when the closed loop that encircles the exceptional point is large, while for the smallest loops, the time-asymmetric phenomenon does not take place. A systematic way for studying the effect of the chosen closed contour that encircles the exceptional point on the time-asymmetric phenomenon is proposed. (C) 2014 AIP Publishing LLC. Workplace J. Heyrovsky Institute of Physical Chemistry Contact Michaela Knapová, michaela.knapova@jh-inst.cas.cz, Tel.: 266 053 196 Year of Publishing 2015
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