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Magnetic properties of localized moments in Dirac conductors

Event Details

Event Dates: 

Monday, October 1, 2012 - 6:00am

Speaker Name(s): 

V. Cheianov

Speaker Affiliation(s): 

University of Lancaster
Seminar Type/Subject

Event Details & Abstract: 

In this talk I will discuss unusual properties of a system of magnetic impurities embedded in a conductor with the Dirac-like dispersion of carriers (such as graphene or a chiral metal). In particular, the system will be shown to exhibit a non-analytic temperature dependent susceptibility at high temperatures.This effect is caused by the non-integrable short-distance singularity of the electron-mediated RKKY exchange between the localized spins resulting in the failure of the usual high-temperature expansion.A modiļ¬cation of the high temperature expansion resolving the short-distance problem will be proposed and the large-temperature susceptibility of the system will be calculated. The results will be used to investigate the critical properties of the system near the magnetic ordering transitions at intermediate temperatures.