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Volumn 82, Issue 12, 2010, Pages

Flat-lens focusing of electrons on the surface of a topological insulator

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EID: 77957739193     PISSN: 10980121     EISSN: 1550235X     Source Type: Journal    
DOI: 10.1103/PhysRevB.82.125423     Document Type: Article
Times cited : (24)

References (40)
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    • We assume that the potential step is perpendicular to the ΓK direction in Fig. so that only odd powers of θi appear in the expansion, Eq. . This assumption is relaxed in Appendix.
    • We assume that the potential step is perpendicular to the Γ K direction in Fig. so that only odd powers of θ i appear in the expansion, Eq.. This assumption is relaxed in Appendix.
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    • The accuracy of the far-field approximation to the diffraction pattern near a cusp caustic has been checked in the context of p - n junctions in graphene by Cs. Péterfalvi, A. Pályi, A. Rusznyák, J. Koltai, and J. Cserti, arXiv:1005.5258 (unpublished). Since our problem is governed by a similar Dirac equation, we expect a similar accuracy, the only difference being that the isotropic Fermi wave vector of graphene is to be replaced by the local radius of curvature of the Fermi surface. More precisely, the condition for the far-field approximation in our case is κ i (0) a, κ t (0) a F1
    • The accuracy of the far-field approximation to the diffraction pattern near a cusp caustic has been checked in the context of p - n junctions in graphene by Cs. Péterfalvi, A. Pályi, A. Rusznyák, J. Koltai, and J. Cserti, arXiv:1005.5258 (unpublished). Since our problem is governed by a similar Dirac equation, we expect a similar accuracy, the only difference being that the isotropic Fermi wave vector of graphene is to be replaced by the local radius of curvature of the Fermi surface. More precisely, the condition for the far-field approximation in our case is κ i (0) a, κ t (0) a F1.


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