Simone Fratini,Institut Néel, Grenoble

Bad metal behavior from slow collective excitations }

(abstract just below) Thursday October 7 at 2:00 pm (GMT+2) Paris time

The seminar will be held on a hybrid format. You can attend the seminar in person at ESPCI (Room Ondes) or you can follow it on Zoom Education.

Best regards, Stéphane Pons and Luca De’ Medici.

Oct. 7 at 2:00 pm (GMT+2) Paris time

In person : Room Ondes, Building B, 3rd floor (a proof of vaccination is requested at the entrance of ESPCI)

and

Bad metal behavior from slow collective excitations

Scattering of charge carriers by slow degrees of freedom can drive an electronic system away from normal transport behavior, causing anomalously large resistivities. This phenomenon relies on the idea that the same localization corrections that make the conductivity vanish in disordered systems, also partially survive when the random environment is dynamical, if its fluctuations are sufficiently slow.

The ensuing "transient localization" of the charge carriers has been thoroughly studied during the last decade. It has been succesful in explaining the anomalous transport behavior of organic semiconductors, where the role of a dynamical random environment is played by slow molecular vibrations.

Because it comes with large enhancements of the resistivity, this general phenomenon is a natural candidate to explain anomalous transport behavior in metals. In this talk I shall review recent and ongoing work aimed at applying the concept of transient localization to correlated systems and other bad metals, and discuss likely sources of dynamical disorder that could be at the origin of the phenomenon.

References :
Pseudogap metal induced by long-range Coulomb interactions
K. Driscoll, A. Ralko, S. Fratini, Phys. Rev. B 103, L201106 (2021)
Displaced Drude peak and bad metal behavior from the interaction with slow scatterers

S. Fratini, S. Ciuchi, SciPost Phys. 11, 039 (2021)

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