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13 papers · 2 filters
Features due to spin-orbit coupling in the optical conductivity of single-layer graphene
P. Ingenhoven, J. Z. Bernad, U. Zuelicke +1
We have calculated the optical conductivity of a disorder-free single graphene sheet in the presence of spin-orbit coupling, using the Kubo formalism. Both intrinsic and structural…
Adiabatic polaron dynamics and Josephson effect in a superconducting molecular quantum dot
A. Zazunov, R. Egger
We study the Josephson current through a resonant level coupled to a vibration mode (local Holstein model) in the adiabatic limit of low oscillator frequency. A semiclassical theor…
Transition from ballistic to diffusive behavior of graphene ribbons in the presence of warping and charged impurities
J. W. Klos, A. A. Shylau, I. V. Zozoulenko +2
We study the effects of the long-range disorder potential and warping on the conductivity and mobility of graphene ribbons using the Landauer formalism and the tight-binding p-orbi…
Josephson effect for SU(4) carbon nanotube quantum dots
A. Zazunov, A. Levy Yeyati, R. Egger
We present the theory of the Josephson effect in nanotube dots where an SU(4) symmetry can be realized. We find a remarkably rich phase diagram that significantly differs from the…
Non-equilibrium supercurrent through a quantum dot: current harmonics and proximity effect due to a normal metal lead
Thibaut Jonckheere, Alex Zazunov, K. Bayandin +2
We consider a Hamiltonian model for a quantum dot which is placed between two superconducting leads with a constant bias imposed between these leads. Using the non-equilibrium Keld…
Quantized magnetic confinement in quantum wires
A. Tarasov, S. Hugger, Hengyi Xu +6
Ballistic quantum wires are exposed to longitudinal profiles of perpendicular magnetic fields composed of a spike (magnetic barrier) and a homogeneous part. An asymmetric magnetoco…