Portrait photo of Subir Sachdev by Katherine Taylor for Quanta Magazine
​Subir Sachdev.
​Photo by Katherine Taylor for Quanta Magazine

General Physics Colloquium: Strange Metals, Black Holes, and Graphene

​Colloquium by Subir Sachdev, Harvard University, one of the highlights of the workshop Applications of Guage/Gravity Duality, 3 - 5 October 2016.

Abstract of talk

States of quantum matter without quasiparticles can be more precisely characterized by their rapid approach to local thermal equilibrium: this is argued to happen in a shortest possible time of order (Planck’s constant)/((Boltmann’s constant)x(absolute temperature)). Remarkably, black hole horizons are physical systems which also equilibrate in this time, with the absolute temperature identified as the Hawking temperature. We now know this similarity is not a co-incidence: I will describe the solvable Sachdev-Ye-Kitaev model of a “strange metal” without quasiparticle excitations, which also turns out to be a theory of a black hole in 1+1 dimensional anti-de Sitter space. Other solvable models of strange metals obtained from the gravitational mapping have inspired analyses of more realistic models of strange metals in the high temperature superconductors and other compounds. Such predictions have been connected to experiments, including some that agree well with observations on graphene.

Applications of Guage/Gravity Duality 2016 is the third yearly instalment of a workshop focussing on how holographic methods, originally coming from string theory, can be applied to study strongly coupled systems in other areas of physics, primarily in condensed matter physics.
​Coffee will be served after the colloquium, outside the lecture room.
Category Colloquium
Location: Kollektorn, MC2 building, Kemivägen 9
Starts: 05 October, 2016, 14:15
Ends: 05 October, 2016, 15:00

Published: Wed 31 Aug 2016. Modified: Mon 03 Oct 2016