Nanohelices as superlattices: Bloch oscillations and electric dipole transitions
arXiv:1610.04186 · doi:10.1103/PhysRevB.94.155306
Abstract
Subjecting a nanohelix to a transverse electric field gives rise to superlattice behavior with tunable electronic properties. We theoretically investigate such a system and find Bloch oscillations and negative differential conductance when a longitudinal electric field (along the nanohelix axis) is also applied. Furthermore, we study dipole transitions across the transverse-electric-field-induced energy gap, which can be tuned to the eulogized terahertz frequency range by experimentally attainable external fields. We also reveal a photogalvanic effect by shining circularly polarized light onto our helical quantum wire.
arXiv comment11 pages, 6 figures
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