National Repository of Grey Literature 2 records found  Search took 0.00 seconds. 
Quantum interference in nanocrystals
Spitzkopf, David ; Ostatnický, Tomáš (advisor) ; Žonda, Martin (referee)
Quantum interference control has is a well described effect in bulk and infinite well super-lattice crystals. In this thesis, we describe this effect in nanocrystals. We use a 8-band model for the description of the electron band structure in the crystal. We then break its inversion symmetry with a linear potential. We then apply external electro- magnetic field and calculate its effect on the crystal with the help of perturbation theory. The fields applied are of two kinds, one harmonic, the other instant in time. We follow with the calculation of the generated current, with detailed numerical tests of several pa- rameters of the model. Conductivity for a non-linearity of the 3rd order is then formally calculated. 1
Terahertz conductivity of Dirac electrons
Spitzkopf, David ; Ostatnický, Tomáš (advisor) ; Slobodeniuk, Artur (referee)
We explore the conductivity of Dirac electrons in the terahertz range, especially in graphene. We are trying to find a boundary condition that is suitable both for the eigen states around the Dirac points and the nanocrystalline structure of graphene. Ultimately we analyze the conductivity of these bound states. 1

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