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Lower bound for the effective mass of the Polaron

MATHPHYS ANALYSIS SEMINAR

Date
Thursday, June 2, 2022 16:15 - 17:15
Speaker
Steffen Polzer (University of Geneva)
Location
Mondi 2 (I01.01.008), Central Building
Series
Seminar/Talk
Tags
Mathematics and CS Seminar, mathematical_seminar_ics
Host
Robert Seiringer
Contact
Central building mondi1

The Fröhlich Polaron describes the slow movement of an electron in a polar crystal. A long open problem is the asymptotics of the effective mass of the electron as the coupling parameter $\alpha$ tends to infinity. While it has been conjectured by Landau and Pekar that the effective mass grows with the fourth power of the coupling parameter, so far it had only been shown by Lieb and Seiringer that the effective mass diverges in the strong coupling limit. I will present recent work where we give a first quantitative lower bound on the effective mass of the Polaron and show that the divergence is at least as fast as $\alpha^{2/5}$ times some constant. For the proof we apply the representation of the path measure of the Polaron in terms of random collections of intervals that has recently been introduced by Mukherjee and Varadhan. Joint work with Volker Betz.


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