1,000 research outputs found
Excitonic gap, phase transition, and quantum Hall effect in graphene
We suggest that physics underlying the recently observed removal of
sublattice and spin degeneracies in graphene in a strong magnetic field
describes a phase transition connected with the generation of an excitonic gap.
The experimental form of the Hall conductivity is reproduced and the main
characteristics of the dynamics are described. Predictions of the behavior of
the gap as a function of temperature and a gate voltage are made.Comment: Revtex4, 10 pages, 4 figures, text essentially extended, one figure
and references added; v3: to match PRB versio
Edge states on graphene ribbon in magnetic field: interplay between Dirac and ferromagnetic-like gaps
By combining analytic and numerical methods, edge states on a finite width
graphene ribbon in a magnetic field are studied in the framework of low-energy
effective theory that takes into account the possibility of quantum Hall
ferromagnetism (QHF) gaps and dynamically generated Dirac-like masses. The
analysis is done for graphene ribbons with both zigzag and armchair edges. The
characteristic features of the spectrum of the edge states in both these cases
are described. In particular, the conditions for the existence of the gapless
edge states are established. Implications of these results for the
interpretation of recent experiments are discussed.Comment: 13 pages, 7 figures. v2: analysis for ribbons with armchair edges
added, to appear in Phys. Rev.
Landau level collapse in graphene in the presence of in-plane radial electric and perpendicular magnetic fields
It is known that in two-dimensional relativistic Dirac systems placed in
orthogonal uniform magnetic and electric fields, the Landau levels collapse as
the applied in-plane electric field reaches a critical value . We
study this phenomenon for a distinct field configuration with in-plane constant
radial electric field. The Dirac equation for this configuration does not allow
analytical solutions in terms of known special functions. The results are
obtained by using both the WKB approximation and the exact diagonalization and
shooting methods. It is shown that the collapse occurs for positive values of
the total angular momentum quantum number, the hole (electron)-like Landau
levels collapse as the electric field reaches the value . The
investigation of the Landau level collapse in the case of gapped graphene shows
a number of distinctive features in comparison with the gapless case.Comment: 14 pages, 5 figures; final version published in PR
Formation and study of the RRAM memory elements by local anodic oxidation method
This work was supported by RFBR according to the research project № 18-37-00299 and by Grant of the President of the Russian Federation No. MK-2721.2018.8
The investigation of regularities of the memristor effect of oxide nanosized titanium structures from the parameters of local anodized oxidation
This work was supported by Grant of the President of the Russian Federation No. MK-2721.2018.8. and by RFBR according to the research project № 18-37-00299
- …