28 citations · 202 across the 20 of their papers we have counts for
20 papers
Merging of the Dirac points in electronic artificial graphene
J. Feilhauer, W. Apel, L. Schweitzer
Theory predicts that graphene under uniaxial compressive strain in an armchair direction should undergo a topological phase transition from a semimetal into an insulator. Due to th…
Comparison of computer-algebra strong-coupling perturbation theory and dynamical mean-field theory for the Mott-Hubbard insulator in high dimensions
Martin Paech, Walter Apel, Eva Kalinowski +1
We present a large-scale combinatorial-diagrammatic computation of high-order contributions to the strong-coupling Kato-Takahashi perturbation series for the Hubbard model in high…
Landau level splitting due to graphene superlattices
G. Pal, W. Apel, L. Schweitzer
The Landau level spectrum of graphene superlattices is studied using a tight-binding approach. We consider non-interacting particles moving on a hexagonal lattice with an additiona…
Electric transport through circular graphene quantum dots: Presence of disorder
G. Pal, W. Apel, L. Schweitzer
The electronic states of an electrostatically confined cylindrical graphene quantum dot and the electric transport through this device are studied theoretically within the continuu…
Correlations in the Ising antiferromagnet on the anisotropic kagome lattice
Walter Apel, Hans-Ulrich Everts
We study the correlation function of middle spins, i. e. of spins on intermediate sites between two adjacent parallel lattice axes, of the spatially anisotropic Ising antiferromagn…
Energy gap in graphene nanoribbons with structured external electric potentials
W. Apel, G. Pal, L. Schweitzer
The electronic properties of graphene zig-zag nanoribbons with electrostatic potentials along the edges are investigated. Using the Dirac-fermion approach, we calculate the energy…