[hep-th] seminar u petak u 14 h

[Branislav Cvetkovic]

Postovane kolege,
u petak 25. decembra u 14 h casova, u sali 300 na Institutu za fiziku, 
Vladimir Juricic ce odrzati seminar pod naslovom  "Elektroni na 
heksagonalnoj resetki: interakcije, simetrije i fazni prelazi". U prilogu 
vam dostavljam apstrakt seminara.
                                              Pozdrav Branislav

Apstrakt: 

In this talk, I will discuss general theory of the local repulsive 
short-range electron interactions on the graphene's honeycomb lattice. 
I will show how various symmetries dictated by the underlying lattice 
together with algebraic relations 
between different local fermionic quartic terms, namely the Fierz 
identities, restrict  the form of the low-energy Hamiltonian. Possible 
semimetal-insulator quantum phase transitions will then be considered in 
the framework of an effective Gross-Neveu-Yukawa theory using an epsilon 
expansion near three spatial dimensions [2]. Finally, I will briefly 
address the role of the long-range Coulomb interaction at the quantum 
critical point near lower critical dimension of the theory [3]. 
References: 
[1] I. F. Herbut, V. Juricic, and B. Roy, Phys. Rev. B 79, 085116 (2009). 
[2] I. F. Herbut, V. Juricic, and O. Vafek, Phys. Rev. B 80, 075432 (2009). 
[3] V. Juricic, I. F. Herbut, and G. W. Semenoff, Phys. Rev. B 80, 
081405(R) (2009). 


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Institute of Physics Belgrade
http://www.ipb.ac.rs/