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UID:0-1067@lptms.universite-paris-saclay.fr
DTSTART;TZID=Europe/Paris:20260120T110000
DTEND;TZID=Europe/Paris:20260120T120000
DTSTAMP:20260115T115122Z
URL:http://www.lptms.universite-paris-saclay.fr/seminars/seminaire-du-lptm
 s-luca-giacomelli-universite-paris-sud/
SUMMARY:Séminaire du LPTMS : Luca Giacomelli (Université Paris Sud) - Sal
 le des séminaires du FAST et du LPTMS\, bâtiment Pascal n°530 - 20 Jan 
 26 11:00
DESCRIPTION:Emergent quantum phase transition of Josephson junction coupled
  to a high-impedance multimode resonator Luca Giacomelli (Laboratoire MPQ\
 , Université Paris)\n\nABSTRACT:\nThe physics of a single Josephson junct
 ion coupled to a resistive environment is a long-standing fundamental prob
 lem at the center of an intense debate about the existence and properties 
 of the superconducting to insulating Schmid-Bulgadaev transition. To circu
 mvent the potential subtleties in the original derivation\, we investigate
  the emergent criticality of a junction coupled to a multimode resonator w
 hen the number of modes is increased [1]. By solving the system via exact 
 diagonalization\, we show that at the transition point the spectrum displa
 ys universality (scale invariance) not only at low frequencies. This refle
 cts in finite-frequency spectral signatures of the phase transition\, in a
 greement with recent experiments. The spectrum at the critical point is su
 ccessfully compared with analytical and numerical results obtained in the 
 past [2]. Finally\, we prove a low-energy exact self-duality of the model\
 , that emerges from two different finite-size circuits with different cons
 erved quantities [3]. This confirms and generalizes the approximate self d
 uality that is usually invoked\, and proves the independence of the transi
 tion point on the ratio of Josephson to charging energy.\n\n[1] Giacomelli
  L.\, Ciuti C. (2024) "Emergent quantum phase transition of a Josephson ju
 nction coupled to a high impedance multimode resonator".Nature Communicati
 ons\, 15(1)\, 5455.\n[2] Paris\, Giacomelli\, Daviet\, Ciuti\, Dupuis\, Mo
 ra (2025) "Resilience of the quantum critical line in the Schmid transitio
 n". Physical Review B\, 111(6)\, 064509.\n[3] Giacomelli L.\, Devoret M. H
 .\, Ciuti C. (2025) "Exact Duality at Low Energy in a Josephson Tunnel Jun
 ction Coupled to a Transmission Line". arXiv:2504.14651.\n
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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