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DTSTART:20260329T030000
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DTSTAMP:20260406T000354Z
UID:1762941600@ist.ac.at
DTSTART:20251112T110000
DTEND:20251112T120000
DESCRIPTION:Speaker: Qimiao Si\nhosted by Kimberly Modic\nAbstract: For qua
 ntum materials in the quantum information era\, some of the outstanding is
 sues are how to use entanglement means to help advance the quantum materia
 ls’ understanding and how to identify those with amplified entanglement.
  Here we focus on strange metals. A notable example occurs in Kondo system
 s\, where the physics of beyond-Landau quantum criticality\, through the p
 rocess of Kondo destruction\, results in a complete loss of quasiparticles
  at the quantum critical point [1]. At this antiferromagnetic quantum crit
 ical point\, the charge degrees of freedom also exhibit a singular respons
 e with dynamical Planckian scaling [2]. This unusual behavior suggests a c
 harge-spin entangled quantum critical fluid\, providing direct motivation 
 for using quantum information means to characterize the strange metal stat
 e. I will show that the quantum Fisher information reveals amplified mult
 ipartite entanglement in the strange metal state [3]. Our theoretical resu
 lts are supported by experiments in quantum critical heavy fermion metals 
 [3\,4]. I will explain how the findings\, in addition to pointing to a nov
 el regime of quantum matter for amplified entanglement\, shed new light on
  the nature of the strange metallicity. Further settings for quantum entan
 glement\, particularly cavity-coupled quantum-critical systems as advanced
  in a very recent study [5]\, will be discussed. [1] H. Hu\, L. Chen & Q.
  Si\, Nat. Phys. 20\, 1863 (2024) (https://doi.org/10.1038/s41567-024-0267
 9-7)\; S. Paschen & Q. Si\, Nat. Rev. Phys. 3\, 9 (2021) (https://doi.org/
 10.1038/s42254-020-00262-6)\; S. Kirchner et al\, Rev. Mod. Phys. 92\, 011
 002 (2020) (https://doi.org/10.1103/RevModPhys.92.011002)\; Q. Si et al.\,
  Nature 413\, 804 (2001) (https://doi.org/10.1038/35101507).[2] A. Cai et 
 al.\, Phys. Rev. Lett. 124\, 027205 (2020) (https://doi.org/10.1103/PhysRe
 vLett.124.027205)\; L. Prochaska et al.\, Science 367\, 285 (2020) (https:
 //doi.org/10.1126/science.aag1595).[3] Y. Fang et al.\, Nat. Commun. 16\, 
 2498 (2025) (https://doi.org/10.1038/s41467-025-57778-7).[4] F. Mazza et a
 l.\, to be published (https://arxiv.org/abs/2403.12779).[5] S. Sur et al.\
 , arXiv:2509.26620 (https://arxiv.org/abs/2509.26620).
LOCATION:Sunstone Bldg / Ground floor / Big Seminar Room A \, ISTA
ORGANIZER:Stephanie.Dolot@ist.ac.at
SUMMARY:Qimiao Si: Strange Metals and Entanglement Witnesses 
URL:https://talks-calendar.ista.ac.at/events/6123
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