Zobrazeno 1 - 10
of 65
pro vyhledávání: '"Milstein, Alexander"'
Publikováno v:
Physica Scripta 94, 055403 (2019)
We survey the results of a long-term study of the process of radiative recombination. A rigorous theory of nonrelativistic electron radiative recombination with a hydrogen-like ion is used to calculate the total cross section of the process, the effe
Externí odkaz:
http://arxiv.org/abs/1810.08071
Publikováno v:
Physical Review B 91, 094417 (2015)
We calculate spectra of magnetic excitations in the spin-spiral state of perovskite manganates. The spectra consist of several branches corresponding to different polarizations and different ways of diffraction from the static magnetic order. Goldsto
Externí odkaz:
http://arxiv.org/abs/1410.6598
The induced current density, corresponding to the massless Dirac equation in (2+1) dimensions in a magnetic flux tube of small radius is considered. This problem is important for graphene. In the case, when an electron can not penetrate the region of
Externí odkaz:
http://arxiv.org/abs/1008.3749
Publikováno v:
Phys. Rev. B.81, 125419 (2010)
The induced charge density, $\rho_{ind}(\bm r)$, generated in graphene by the potential well of the finite radius $R$ is considered. The result for $\rho_{ind}(\bm r)$ is derived for large distances $r\gg R$. We also obtained the induced charges outs
Externí odkaz:
http://arxiv.org/abs/0912.0770
Publikováno v:
Phys. Rev. B 78, 014501 (2008)
We consider the extended 2D $t-t'-t''-J$ model at zero temperature. Parameters of the model corresponds to doping by holes. Using the low doping effective action we demonstrate that the system can 1) preserve the long range collinear antiferromagneti
Externí odkaz:
http://arxiv.org/abs/0711.4865
Publikováno v:
Physical Review Letters 100, 076803 (2008)
We calculate exactly the vacuum polarization charge density in the field of a subcritical Coulomb impurity, $Z|e|/r$, in graphene. Our analysis is based on the exact electron Green's function, obtained by using the operator method, and leads to resul
Externí odkaz:
http://arxiv.org/abs/0708.4263
Publikováno v:
Phys. Rev. B 75, 235120 (2007)
We derive the low-energy effective field theory of the extended t-J model in the regime of light doping. The action includes a previously unknown Berry phase term, which is discussed in detail. We use this effective field theory to calculate spin-wav
Externí odkaz:
http://arxiv.org/abs/cond-mat/0703172
Publikováno v:
Phys. Rev. Lett. 98, 037001 (2007)
Starting from the t-J model, we derive an effective field theory describing the spin dynamics in the insulating phase of La_{2-x}Sr_xCuO_4, x < 0.055, at low temperature. Using Monte Carlo simulations, we show that the destruction of Neel order is dr
Externí odkaz:
http://arxiv.org/abs/cond-mat/0606679
Publikováno v:
Phys. Rev. B 73, 085122 (2006)
Experimental observations of lightly doped La_{2-x}Sr_xCuO_4, x < 0.02, revealed remarkable magnetic properties such as the incommensurate noncollinear ordering (additional to the Neel ordering) and a tremendous doping dependence of the uniform longi
Externí odkaz:
http://arxiv.org/abs/cond-mat/0511453