{"id":120,"date":"2021-10-07T16:06:17","date_gmt":"2021-10-07T14:06:17","guid":{"rendered":"http:\/\/quantummattertheory.fr\/?page_id=120"},"modified":"2026-06-04T18:18:18","modified_gmt":"2026-06-04T16:18:18","slug":"schedule","status":"publish","type":"page","link":"https:\/\/quantummattertheory.fr\/?page_id=120","title":{"rendered":"Schedule"},"content":{"rendered":"\n<p><span class=\"has-inline-color has-black-color\">Find the upcoming seminars below.<\/span><\/p>\n\n\n\n<hr class=\"wp-block-separator has-text-color has-background has-black-background-color has-black-color is-style-wide\"\/>\n\n\n\n<p>TQM seminar #47 : June 18, 2026, 2pm (LPTMC seminar room, towers 13-12, 5th floor, room 523)<\/p>\n\n\n\n<p><strong><strong><strong>Luca Giacomelli<\/strong><\/strong> <\/strong>(MPQ, UPC)<\/p>\n\n\n\n<p><em>A Josephson junction in a multimode environment: emergent quantum phase transition and exact low-energy duality<\/em><\/p>\n\n\n\n<p>The physics of a single Josephson junction coupled to a resistive environment is a long-standing fundamental problem at the center of an intense debate about the existence and properties of the superconducting-to-insulating Schmid-Bulgadaev transition. To circumvent the potential subtleties in the original derivation, we investigate the emergent criticality of a junction coupled to a multimode resonator when the number of modes is increased [1]. By solving the system via exact diagonalization, we show that at the transition point the spectrum displays universality (scale invariance) not only at low frequencies. This reflects in finite-frequency spectral signatures of the phase transition, in agreement with recent experiments. The spectrum at the critical point is successfully 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 conserved quantities [3]. This confirms and generalizes the approximate self duality that is usually invoked, and proves the independence of the transition point on the ratio of Josephson to charging energy.<br><br>[1] Giacomelli L., Ciuti C., Nature Communications, <a href=\"callto:15(1), 5455 (2024\">15(1), 5455 (2024<\/a>) <\/p>\n\n\n\n<p>[2] Paris, Giacomelli, Daviet, Ciuti, Dupuis, Mora, Phys. Rev. B, <a href=\"callto:111(6), 064509 (2025\">111(6), 064509 (2025<\/a>) <\/p>\n\n\n\n<p>[3] Giacomelli L., Devoret M. H., Ciuti C., Phys. Rev. Lett., <a href=\"callto:136(13), 130401 (2026\">136(13), 130401 (2026<\/a>)<\/p>\n\n\n\n<hr class=\"wp-block-separator has-text-color has-background has-black-background-color has-black-color is-style-wide\"\/>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Find the upcoming seminars below. TQM seminar #47 : June 18, 2026, 2pm (LPTMC seminar room, towers 13-12, 5th floor, room 523) Luca Giacomelli (MPQ, UPC) A Josephson junction in a multimode environment: emergent quantum phase transition and exact low-energy &hellip; <a href=\"https:\/\/quantummattertheory.fr\/?page_id=120\">Continue reading <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":[],"_links":{"self":[{"href":"https:\/\/quantummattertheory.fr\/index.php?rest_route=\/wp\/v2\/pages\/120"}],"collection":[{"href":"https:\/\/quantummattertheory.fr\/index.php?rest_route=\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/quantummattertheory.fr\/index.php?rest_route=\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/quantummattertheory.fr\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/quantummattertheory.fr\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=120"}],"version-history":[{"count":286,"href":"https:\/\/quantummattertheory.fr\/index.php?rest_route=\/wp\/v2\/pages\/120\/revisions"}],"predecessor-version":[{"id":650,"href":"https:\/\/quantummattertheory.fr\/index.php?rest_route=\/wp\/v2\/pages\/120\/revisions\/650"}],"wp:attachment":[{"href":"https:\/\/quantummattertheory.fr\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=120"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}