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27 papers · 2 filters
Search for Majorana fermions in superconductors
C. W. J. Beenakker
This is a colloquium-style introduction to the midgap excitations in superconductors known as Majorana fermions. These elusive particles, equal to their own antiparticle, may or ma…
Coulomb-assisted braiding of Majorana fermions in a Josephson junction array
B. van Heck, A. R. Akhmerov, F. Hassler +2
We show how to exchange (braid) Majorana fermions in a network of superconducting nanowires by control over Coulomb interactions rather than tunneling. Even though Majorana fermion…
Symmetries and the conductance of graphene nanoribbons with long-range disorder
J. Wurm, M. Wimmer, K. Richter
We study the conductance of graphene nanoribbons with long-range disorder. Due to the absence of intervalley scattering from the disorder potential, time-reversal symmetry (TRS) ca…
Spatially resolved electronic inhomogeneities of graphene due to subsurface charges
Andres Castellanos-Gomez, Roel H. M. Smit, Nicolás Agraït +1
We probe the local inhomogeneities in the electronic properties of exfoliated graphene due to the presence of charged impurities in the SiO2 substrate using a combined scanning tun…
Dirac boundary condition at the reconstructed zigzag edge of graphene
J. A. M. van Ostaay, A. R. Akhmerov, C. W. J. Beenakker +1
Edge reconstruction modifies the electronic properties of finite graphene samples. We formulate a low-energy theory of the reconstructed zigzag edge by deriving the modified bounda…
Topological quantum number and critical exponent from conductance fluctuations at the quantum Hall plateau transition
I. C. Fulga, F. Hassler, A. R. Akhmerov +1
The conductance of a two-dimensional electron gas at the transition from one quantum Hall plateau to the next has sample-specific fluctuations as a function of magnetic field and F…