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Effect of Angular Momentum of Light in Interaction with Dirac Matter

Ghadimi, Rasoul | 2013

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 45497 (04)
  4. University: Sharif University of Technology
  5. Department: Physics
  6. Advisor(s): Jafari, Akbar; Miri, Mir Faez
  7. Abstract:
  8. In this project, we investigate the influence of angular momentum of Light on the Dirac matter. We show that polarization or spin of light can change the population of [pseudo-]spins. In graphene, pseudo-spins indicate the probability of existing elec-trons in each sub-lattice. However, the two different sub-lattices are the same and the contribution from two distinct Dirac cones cancel out. Therefore, the change in the population of pseudo-spins does not happen. On the other hand, in topological insulators we have just one Dirac cone; thus, polarization of light can change the population of [pseudo-]spins
  9. Keywords:
  10. Dirac Fermion ; Angular Momentum ; Spinor Population

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