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X-WR-CALNAME:Laboratoire de physique des Solides
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DTSTART;TZID=Europe/Paris:20250612T110000
DTEND;TZID=Europe/Paris:20250612T120000
DTSTAMP:20250610T114800
UID:MEC-b72a5a099433a2099fc3d92f6ad3accf@lps.u-psud.fr
CREATED:20250610
LAST-MODIFIED:20250610
PRIORITY:5
TRANSP:OPAQUE
SUMMARY:Nayuta TAKEMORI. Superconductivity and emerging functionalities in aperiodic crystals: From quasicrystals to hyperuniform structures
DESCRIPTION:\nNayuta TAKEMORI, Osaka University, Tokoyama, Japan\n\n\n\nLe résumé :\n\n\n\n-=-=-=-=-=-=-=-=-=-=-=-=\n\n\n\nQuasicrystals, since their discovery by Dan Shechtman, have attracted growing interest due to their unique combination of long-range order and aperiodicity. These structural features give rise to unconventional electronic states, including anomalous transport and, more recently, superconductivity. Bulk superconductivity has been experimentally confirmed in a Bergman-type Al-Mg-Zn quasicrystal (Tc = 50 mK) [1], and in the van der Waals quasicrystal TaTe1.6 (Tc = 1 K) [2]. These findings challenge conventional views of superconductivity based on translational symmetry.\n\n\n\nI will introduce recent theoretical advances on superconductivity in quasicrystals, using real-space techniques such as Bogoliubov–de Gennes formalism and real-space dynamical mean-field theory. Our studies [3-6] predict non-BCS type superconductivity, including finite-momentum Cooper pairing and finite paramagnetic current even at zero temperature. These features offer a coherent explanation for experimental deviations from standard BCS theory, such as the reduced specific heat jump in quasicrystals.\n\n\n\nIn the second part, I will briefly introduce our recent initiative on hyperuniform aperiodic materials, based on a classification of structures proposed by Salvatore Torquato [7] that generalize the concept of order beyond periodicity and quasiperiodicity. \n\n\n\n[1] K. Kamiya et al., Nat. Commun. 9, 154 (2018).\n\n\n\n[2] Y. Tokumoto et al., Nat. Commun. 15, 1529 (2024).\n\n\n\n[3] S. Sakai et al., Phys. Rev. B 95, 024509 (2017).\n\n\n\n[4] N. Takemori et al., Phys. Rev. B 102, 115108 (2020).\n\n\n\n[5] T. Fukushima et al., J. Phys.: Conf. Ser. 2461, 012014 (2023).\n\n\n\n[6] T. Fukushima et al., Phys. Rev. Res. 5, 043164 (2023).\n\n\n\n[7] S. Torquato et al., PRE 68, 041113 (2003); S. Torquato, Physics Reports 745 (2018).\n\n\n\n-=-=-=-=-=-=-=-=-=-=-=-\n
URL:https://www.lps.u-psud.fr/en/events/nayuta-takemori-superconductivity-and-emerging-functionalities-in-aperiodic-crystals-from-quasicrystals-to-hyperuniform-structures/
CATEGORIES:Condensed Matter Theory Seminar,Seminars
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