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Condensed Matter Seminars

ics  Joint Nuclear/Condensed Matter Physics Seminar

Thursday, December 4, 2014
3:30 PM
Physics Building, Room 204
Note special time.
Note special room.
Genya Kolomeisky [Host: Oscar Rondon]
University of Virginia
"Optimal number of terms in QED series and its consequence in condensed matter implementations of QED"

In 1952 Dyson put forward a simple and powerful argument indicating that the perturbative expansions of QED are asymptotic. His argument can be related to Chandrasekhar's limit on the mass of a star for stability against gravitational collapse. Combining these two arguments we estimate the optimal number of terms of the QED series to be approximately 5000. For condensed matter manifestations of QED in narrow band-gap semiconductors and Weyl semimetals the optimal number of terms is around 80 while in graphene the utility of the perturbation theory is severely limited.

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