Essays about: "Dirac cone"

Found 2 essays containing the words Dirac cone.

  1. 1. Pair Production and the Light-Front Vacuum

    University essay from Institutionen för fysik

    Author : Ramin Ghorbani Ghomeshi; [2013]
    Keywords : Strong-Field QED; Quantum Vacuum; Schwinger Pair Production Mechanism; Dirac Forms of Relativistic Dynamics; Light-front Quantization; Zero-mode Issue; DLCQ; Worldline Approach;

    Abstract : Dominated by Heisenberg's uncertainty principle, vacuum is not quantum mechanically an empty void, i.e. virtual pairs of particles appear and disappear persistently. This nonlinearity subsequently provokes a number of phenomena which can only be practically observed by going to a high-intensity regime. READ MORE

  3. 2. Curvature-Induced Energy Band Tilting in Finite-Length Carbon Nanotubes

    University essay from Institutionen för fysik

    Author : Anton Vikström; [2011]
    Keywords : carbon nanotubes; graphene; Dirac cone; condensed matter; velocity asymmetry; tilting; kolnanorör; grafen; Dirac-kon; kondenserade materien; hastighetsasymmetri; lutning;

    Abstract : The near-Fermi-energy energy band structure of carbon nanotubes is given by cross-sections of the graphene Dirac cones near the K and K' points. Using second-order perturbation theory and a nearest-neighbor approximated tight-binding model, curvature-induced corrections to the graphene-based effective model are derived. READ MORE