Rashba Spin Orbit Interaction and Birefringent Electron Optics in Graphene
arXiv:1209.4415 · doi:10.1103/PhysRevB.87.075420
Abstract
Electron optics exploits the analogies between rays in geometrical optics and electron trajectories, leading to interesting insights and potential applications. Graphene, with its two-dimensionality and photon-like behavior of its charge carriers, is the perfect candidate for the exploitation of electron optics. We show that a circular gate-controlled region in the presence of Rashba spin-orbit interaction in graphene may indeed behave as a Veselago electronic lens but with two different indices of refraction. We demonstrate that this birefringence results in complex caustics patterns for a circular gate, selective focusing of different spins, and the possible direct measurement of the Rashba coupling strength in scanning probe experiments.
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- Chaos in Dirac electron optics: Emergence of a relativistic quantum chimera
- Scattering of two-dimensional Dirac fermions on gate-defined oscillating quantum dots
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- Dot-bound and dispersive states in graphene quantum dot superlattices
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