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Criticality in self-dual sine-Gordon models
P. Lecheminant, A. O. Gogolin, A. A. Nersesyan
We discuss the nature of criticality in the self-dual extention of the sine-Gordon model. This field theory is related to the two-dimensional classical XY model with a…
Effective low-energy theory for correlated carbon nanotubes
Reinhold Egger, Alexander O. Gogolin
The low-energy theory for single-wall carbon nanotubes including Coulomb interactions is derived and analyzed. It describes two fermion chains without interchain hopping but couple…
Kondo effect versus Jahn-Teller effect: A new class of quantum impurity problems
Alexander O. Gogolin
Impurity ions with orbitally degenerate ground electronic configuration embedded in metals are subjects to both the Kondo effect and the Jahn-Teller instability. While increasing t…
Interacting one dimensional electron gas with open boundaries
M. Fabrizio, Alexander O. Gogolin
We discuss the properties of interacting electrons on a finite chain with open boundary conditions. We extend the Haldane Luttinger liquid description to these systems and study ho…
Anderson-Yuval approach to the multichannel Kondo problem
M. Fabrizio, Alexander O. Gogolin, Ph. Nozières
We analyze the structure of the perturbation expansion of the general multichannel Kondo model with channel anisotropic exchange couplings and in the presence of an external magnet…
Toulouse limit for the overscreened four-channel Kondo problem
M. Fabrizio, Alexander O. Gogolin
We show that the spin dynamics of the 4--channel Kondo model is equivalent to the one of a model with a spin 1/2 impurity coupled to spin 1 conduction electrons. By abelian bosoniz…