Upcoming ICTP/SISSA Stat.Physics Seminar

[Statistical Physics]

JOINT ICTP/SISSA STATISTICAL PHYSICS SEMINAR


Tuesday, 30 September 2014 - 11:00 a.m.*
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SISSA Santorio Building, Room 138


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Speaker:    Nicolas GRANDI (La Plata University, Argentina)

Title:        Low energy electron-phonon effective action from symmetry 
analysis


Abstract:
In this talk, based on a detailed symmetry analysis, I will state the 
general rules to build up the effective
low energy field theory describing a system of electrons weakly 
interacting with the lattice degrees of
freedom. The basic elements in the construction are the invariant 
tensors that keep track of the microscopic
discrete symmetries into the coarse-grained action. The approach can be 
applied to lattice systems in arbitrary
dimensions and in a systematic way to any desired order in derivatives. 
I will show the application of the
method to the honeycomb lattice and re-obtain the well-known effective 
action for graphene, containing
Dirac fermions coupled to a fictitious gauge field. The talk is based on 
the results of arXiv:1303.3442 <http://arxiv.org/abs/1303.3442>