31 citations · 239 across the 41 of their papers we have counts for
15 papers · 1 filter
Symmetry of electron bands in graphene: (nearly) free electron vs. tight-binding
Eugene Kogan, Vyacheslav M. Silkin
We present the symmetry labelling of all electron bands in graphene obtained by combining numerical band calculations and analytical analysis based on group theory. The latter was…
Green's functions and DOS for some 2D lattices
Eugene Kogan, Godfrey Gumbs
In this note we present the Green's functions and density of states for the most frequently encountered 2D lattices: square, triangular, honeycomb, kagome, and Lieb lattice. Though…
Poor man's scaling: Coqblin--Schrieffer model revisited
Eugene Kogan, Zheng Shi
We derive the third-order poor man's scaling equation for a generic Hamiltonian describing a quantum impurity embedded into an itinerant electron gas. We show that the Coqbli…
Irradiation-induced broadening of the Raman spectra in monolayer graphene
I. Shlimak, A. Butenko, E. Kogan +1
Broadening of the Raman scattering (RS) spectra was studied in monolayer graphene samples irradiated with various dose of ions followed by annealing of radiation damage at differen…
Spin-anisotropic magnetic impurity in a Fermi gas: poor man's scaling equation integration
Eugene Kogan, Kazuto Noda, Seiji Yunoki
We consider a single magnetic impurity described by the spin--anisotropic s-d(f) exchange (Kondo) model and formulate scaling equation for the spin-anisotropic model when the densi…
Electronic structure of graphene: (nearly) free electrons bands vs. tight-binding bands
E. Kogan, V. M. Silkin
In our previous paper (Phys. Rev. B {\bf 89}, 165430 (2014)) we have found that in graphene, in distinction to the four occupied bands, which can be described by the simple tight-b…
Density-dependent thermopower oscillations in mesoscopic two-dimensional electron gases
Vijay Narayan, Eugene Kogan, Chris Ford +6
We present thermopower and resistance measurements on GaAs-based mesoscopic two-dimensional electron gases (2DEGs) as functions of the electron density . At high …
Opening of a Gap in Graphene Due to Supercell Potential: Group Theory Point of View
E. Kogan, M. Kaveh
We analyze in the framework of the space group theory the change of the dispersion law in grapenein the vicinity of the (former) Dirac points due to application of supercell potent…
Comment on the "Create Dirac Cones in Your Favorite Materials", by Chia-Hui Lin and Wei Ku (arXiv:1303.4822)
E. Kogan
Recently a paper by Lin and Ku \cite{lin} was posted, where the authors propose a very interesting idea to engineer the Dirac points in material which originally did not have such…
All approaches to RKKY interaction in graphene are equal, but some approaches are more equal than others
E. Kogan
We show explicitly that two approaches to calculations of RKKY interaction between two magnetic impurities in graphene based on Green's functions: one using coordinate--imaginary t…
While calculating RKKY interaction in graphene no theorist should do a cut-off without cause
E. Kogan
In our previous work (E. Kogan, Phys. Rev. B 84, 115119 (2011)) we presented calculation of RKKY interaction between two magnetic impurities in graphene based on Matsubara Green's…
Why Dirac points in graphene are where they are?
E. Kogan
We present a simple group theory explanation of the fact that the energy bands merge in the corners of the Brillouin zone for graphene and for two particular cases of Kagome lattic…
Absence of weak antilocalization in ferromagnetic films
Noa Kurzweil, Eugene Kogan, Aviad Frydman
We present magnetoresistance measurements performed on ultrathin films of amorphous Ni and Fe. In these films the Curie temperature drops to zero at small thickness, making it poss…
The Shortest Path Across the Mesoscopic System
Liqun He, Eugene Kogan, Dawei Luo
We study distribution functions (DF) of mesoscopic hopping conductance numerically by searching for the shortest path. We have found that the distributions obtained by choosing ran…
Distribution function of mesoscopic hopping conductance
Liqun He, Eugene Kogan, Moshe Kaveh +2
We study by computer simulation distribution functions (DF) of mesoscopic hopping conductance. The DFs obtained for one-dimensional systems were found to be quite close to the pred…