You are cordially invited to the SCL online seminar of the Center for the Study of Complex Systems, which will be held on Thursday, 25 April 2024 at 14:00 on Zoom (the link is given below). The talk entitled

A semi-holographic framework for strange metallic transport

will be given by Hareram Swain (Center for Operator Algebras, Geometry, Matter and Spacetime, IIT Madras, India). The abstract of the talk:

Strange metals exhibit anomalous transport properties than normal fermi liquids. Hence, we need to go beyond the conventional picture of quasi-particles to unravel the mechanism. The ARPES experiment data has given us key insights into the nature of elementary constituents in strongly correlated electronic systems that do not admit quasiparticle description, and also demonstrate a rich variety of novel superconducting, metal, and insulating phases. In this talk, we will give a semi-holographic explanation for such behaviors. Based on the key insights provided by Faulkner and Polchinski, we propose an effective theory in which the electron of a two-dimensional band hybridizes with a fermionic operator of a critical holographic sector, while also interacting with other bands that preserve quasiparticle characteristics.  Besides the scaling dimension $\nu$ of the fermionic operator in the holographic sector, the effective theory has two dimensionless couplings $\alpha$ and $\gamma$ determining the holographic and Fermi-liquid-type contributions to the self-energy respectively. We will also show the origin of the linear-in-T resistivity and strange metallic behavior as a consequence of the emergence of a universal form of the spectral function, which is independent of the model parameters when the ratio of the two couplings takes optimal values determined only by the critical exponent. We will also explain the Planckian dissipation scenario in our model.

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