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Quantum transport through 3D Dirac materials

Salehi, M ; Sharif University of Technology | 2015

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  1. Type of Document: Article
  2. DOI: 10.1016/j.aop.2015.04.007
  3. Publisher: Academic Press Inc , 2015
  4. Abstract:
  5. Bismuth and its alloys provide a paradigm to realize three dimensional materials whose low-energy effective theory is given by Dirac equation in 3+1 dimensions. We study the quantum transport properties of three dimensional Dirac materials within the framework of Landauer-Büttiker formalism. Charge carriers in normal metal satisfying the Schrödinger equation, can be split into four-component with appropriate matching conditions at the boundary with the three dimensional Dirac material (3DDM). We calculate the conductance and the Fano factor of an interface separating 3DDM from a normal metal, as well as the conductance through a slab of 3DDM. Under certain circumstances the 3DDM appears transparent to electrons hitting the 3DDM. We find that electrons hitting the metal-3DDM interface from metallic side can enter 3DDM in a reversed spin state as soon as their angle of incidence deviates from the direction perpendicular to interface. However the presence of a second interface completely cancels this effect
  6. Keywords:
  7. Bismuth ; Boundary condition ; Landauer-Büttiker formalism ; Three dimensional Dirac material
  8. Source: Annals of Physics ; Volume 359 , 2015 , Pages 64-72 ; 00034916 (ISSN)
  9. URL: http://www.sciencedirect.com/science/article/pii/S0003491615001402