Bipolar electron waveguides in graphene
arXiv:2008.11624 · doi:10.1103/PhysRevB.102.155421
Abstract
We show analytically that the ability of Dirac materials to localize an electron in both a barrier and a well can be utilized to open a pseudo-gap in graphene's spectrum. By using narrow top-gates as guiding potentials, we demonstrate that graphene bipolar waveguides can create a non-monotonous one-dimensional dispersion along the electron waveguide, whose electrostatically controllable pseudo-band-gap is associated with strong terahertz transitions in a narrow frequency range.
arXiv comment21 pages and 3 figures
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- Ballistic guided electrons against disorder in graphene nanoribbons
- Designer gapped and tilted Dirac cones in lateral graphene superlattices