About: Helium in chirped laser fields as a time-asymmetric atomic switch

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rdf:type	skos:Concept http://linked.opendata.cz/ontology/domain/vavai/Vysledek
Description	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. 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. (en)
Title	Helium in chirped laser fields as a time-asymmetric atomic switch Helium in chirped laser fields as a time-asymmetric atomic switch (en)
skos:prefLabel	Helium in chirped laser fields as a time-asymmetric atomic switch Helium in chirped laser fields as a time-asymmetric atomic switch (en)
skos:notation	RIV/61388955:_____/14:00434945!RIV15-GA0-61388955
http://linked.open...avai/riv/aktivita	I P
http://linked.open...avai/riv/aktivity	I, P(GAP205/11/0571)
http://linked.open...iv/cisloPeriodika	1
http://linked.open...vai/riv/dodaniDat	2015
http://linked.open...aciTvurceVysledku	Kaprálová-Žďánská, Petra Ruth
http://linked.open.../riv/druhVysledku	J - Článek v odborném periodiku
http://linked.open...iv/duvernostUdaju	S - Úplné a pravdivé údaje nepodléhající ochraně podle zvláštních právních předpisů
http://linked.open...titaPredkladatele	Ústav fyzikální chemie J. Heyrovského AV ČR, v.v.i.
http://linked.open...dnocenehoVysledku	18920
http://linked.open...ai/riv/idVysledku	RIV/61388955:_____/14:00434945
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	Atom lasers; Laser pulses; Helium (en)
http://linked.open.../riv/klicoveSlovo	Atom lasers Laser pulses Helium
http://linked.open...odStatuVydavatele	US - Spojené státy americké
http://linked.open...ontrolniKodProRIV	[B4AFAB11754B]
http://linked.open...i/riv/nazevZdroje	Journal of Chemical Physics
http://linked.open...in/vavai/riv/obor	CF
http://linked.open...ichTvurcuVysledku	1 (xsd:int)
http://linked.open...cetTvurcuVysledku	2 (xsd:int)
http://linked.open...vavai/riv/projekt	Ionization and excitation of atomic and molecular gases exposed to intense extreme ultraviolet radiation: theory and experiment
http://linked.open...UplatneniVysledku	2014
http://linked.open...v/svazekPeriodika	141
http://linked.open...iv/tvurceVysledku	Kaprálová-Žďánská, Petra Ruth Moiseyev, N.
http://linked.open...ain/vavai/riv/wos	000339622000019
issn	0021-9606
number of pages	14 (xsd:int)
http://bibframe.org/vocab/doi	10.1063/1.4885136

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