BEGIN:VCALENDAR VERSION:2.0 PRODID:researchseminars.org CALSCALE:GREGORIAN X-WR-CALNAME:researchseminars.org BEGIN:VEVENT SUMMARY:Subir Sachdev (Department Chair\, Herchel Smith Professor of Physi cs\, Department of Physics\, Harvard University\, Boston\, USA) DTSTART:20200514T150000Z DTEND:20200514T170000Z DTSTAMP:20260423T010808Z UID:QASTM/2 DESCRIPTION:Title: Li near in temperature resistivity in the limit of zero temperature from the time reparameterization soft mode\nby Subir Sachdev (Department Chair\ , Herchel Smith Professor of Physics\, Department of Physics\, Harvard Uni versity\, Boston\, USA) as part of Quantum Aspects of Space-Time and Matte r\n\nLecture held in QASTM seminar series talk.\n\nAbstract\nThe most puzz ling aspect of the `strange metal' behavior of correlated electron compoun ds is that the linear in temperature resistivity often extends down to low temperatures\, lower than natural microscopic energy scales. We consider recently proposed deconfined critical points (or phases) in models of elec trons in large dimension lattices with random nearest-neighbor exchange in teractions. The criticality is in the class of Sachdev-Ye-Kitaev models\, and exhibits a time reparameterization soft mode representing gravity in d ual holographic theories. We compute the low-temperature resistivity in a large M limit of models with SU(M) spin symmetry\, and find that the domin ant temperature dependence arises from this soft mode. The resistivity is linear in temperature down to zero temperature at the critical point\, wit h a co-efficient universally proportional to the product of the residual r esistivity and the co-efficient of the linear in temperature specific heat . We argue that the time reparameterization soft mode offers a promising a nd generic mechanism for resolving the strange metal puzzle.\n LOCATION:https://researchseminars.org/talk/QASTM/2/ END:VEVENT END:VCALENDAR