12,595,922 research outputs found
On unification of gravitation and electromagnetism in the framework of a general-relativistic approach
We consider the unification problem for the gravitational and electromagnetic
interactions and its possible solution on the basis of the existence of an
effective Riemannian space in nonlinear electrodynamicsComment: 3 pages, Talk given at the International Conference RUSGRAV-13, June
23-28, 2008, PFUR, Mosco
A local gauge invariant infrared regularization of the Yang-Mills theory
A local gauge invariant infrared regularization for the Yang-Mills theory is
constructed on the basis of a higher derivative formulation of the model.Comment: 7 page
Multiphonon anharmonic decay of a quantum mode
A nonperturbative theory of multiphonon anharmonic transitions between energy
levels of a local mode is presented. It is shown that the rate of transitions
rearranges near the critical level number : at smaller the process
slows down, while at larger it accelerates in time, causing a jump-like
loss of energy followed by the generation of phonon bursts. Depending on
parameters, phonons are emitted in pairs, triplets etc.Comment: submitted to Europhys.Let
Thin topological insulator film in a perpendicular magnetic field
We report on a study of an ultrathin topological insulator film with
hybridization between the top and bottom surfaces, placed in a quantizing
perpendicular magnetic field. We calculate the full Landau level spectrum of
the film as a function of the applied magnetic field and the magnitude of the
hybridization matrix element, taking into account both the orbital and the
Zeeman spin splitting effects of the field. For an undoped film, we find a
quantum phase transition between a state with a zero Hall conductivity and a
state with a quantized Hall conductivity equal to , as a function of the
magnitude of the applied field. The transition is driven by the competition
between the Zeeman and the hybridization energies.Comment: 4+ pages, 1 figure, published versio
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