BEGIN:VCALENDAR VERSION:2.0 PRODID:researchseminars.org CALSCALE:GREGORIAN X-WR-CALNAME:researchseminars.org BEGIN:VEVENT SUMMARY:Dung Xuan Nguyen (Brown University) DTSTART:20211122T170000Z DTEND:20211122T180000Z DTSTAMP:20260423T021421Z UID:QM3/52 DESCRIPTION:Title: Mul tiple Gravitons and spectral sum rules in Fractional Quantum Hall systems< /a>\nby Dung Xuan Nguyen (Brown University) as part of Quantum Matter meet s Maths (IST\, Lisbon)\n\n\nAbstract\nIn this talk\, I will provide the hi storical review of magneto-roton excitation\, which is the gapped neutral excitation in the Lowest Landau Level. \nThe magneto-roton mode has spin-2 and can be considered as a massive graviton mode in 2+1D [1]. This spin-2 mode plays a central role in the physics of FQH. \nIn the current literat ure\, the spin-2 mode of Jain's sequences near filling fraction 1/2 can be thought of as the shear deformation of the composite fermion Fermi surfac e [2]. In this talk\, I will show that for Jain's sequences near filling f raction 1/4\, there will be an extra massive graviton mode [3]. The extra mode was proposed in our recent work on the Dirac composite fermion theory of general Jain's sequences in order to satisfy the Haldane bound of the static structure factor. The extra mode was confirmed numerically recently with the guidance of FQH sum rules [4]. I will briefly discuss our physic al interpretation of the new massive graviton mode. If time allows\, I wil l describe the experimental setup that can detect the graviton modes [5]. \n\nReferences:\n\n[1] Siavash Golkar\, Dung X. Nguyen and Dam T. Son JHE P 021\, 01 (2016) \n\n[2] DX Nguyen\, A Gromov\, DT Son\, Physical Revi ew B 97 (19)\, 195103 (2018)\n\n[3] DX Nguyen\, DT Son\, arXiv:2105.02092 (2021)\n\n[4] DX Nguyen\, Edward Rezayi\, Dam T. Son and Kun Yang To ap peared (Arxiv:2111.xxxxx)\n\n[5] DX Nguyen\, DT Son\, Phys. Rev. Research 3\, 023040 (2021)\n LOCATION:https://researchseminars.org/talk/QM3/52/ END:VEVENT END:VCALENDAR