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UID:0-907@lptms.universite-paris-saclay.fr
DTSTART;TZID=Europe/Paris:20230920T100000
DTEND;TZID=Europe/Paris:20230920T110000
DTSTAMP:20230918T081254Z
URL:http://www.lptms.universite-paris-saclay.fr/seminars/seminaire-informe
 l-kinya-takahashi-kyushu-institute-of-technology/
SUMMARY:Séminaire informel : Kin'Ya Takahashi (Kyoto University) - Salle d
 es séminaires du FAST et du LPTMS\, bâtiment Pascal n°530 - 20 Sep 23 1
 0:00
DESCRIPTION:Noninstanton tunneling for a periodically perturbed rounded-rec
 tangular potential\n&nbsp\;\nKin'Ya Takahashi (Kyoto University)\n&nbsp\;\
 n\nWe study tunneling probabilities with changing Planck’s constant for 
 a periodically perturbed rounded rectangular potential\, for which instant
 on tunneling is substantially prohibited. The periodical perturbation crea
 tes an energy ladder of harmonic channels at En = EI + n hbar　ω. Harmon
 ic channels above the potential height V0 induce multi-quanta absorption t
 unneling (MQAT)\, and the harmonic channel just above V0 dominantly contri
 butes to noninstanton tunneling. The replacement of the dominant harmonic 
 channel makes a sawtooth structure with changing 1/hbar. The sawtooth stru
 cture made by the tunneling probability in the potential region is accompa
 nied by resonance peaks due to the resonance states above the potential. T
 he sawtooth structure is also observed with changing ω. Thus\, this is th
 e essential nature of MQAT. We introduce an effective formula to character
 ize the profile of the sawtooth structure. Furthermore\, the sawtooth stru
 cture can be reproduced by the complex semiclassical method except for sma
 ll neighborhoods the switching regions including resonance peaks. The Meln
 ikov method\, i.e.\, approximate semiclassical method\, provides the essen
 tially same formula as mentioned above.
CATEGORIES:seminars
LOCATION:Salle des séminaires du FAST et du LPTMS\, bâtiment Pascal n°53
 0\, rue André Riviere\, Orsay\, 91405\, France
X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=rue André Riviere\, Orsay\
 , 91405\, France;X-APPLE-RADIUS=100;X-TITLE=Salle des séminaires du FAST 
 et du LPTMS\, bâtiment Pascal n°530:geo:0,0
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