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Electric field controlled valley-polarized photocurrent switch based on the circular bulk photovoltaic effect
- Source :
- Phys. Rev. B 109, 235403 (2024)
- Publication Year :
- 2024
-
Abstract
- Efficient electric manipulation of valley degrees of freedom is critical and challenging for the advancement of valley-based information science and technology. We put forth an electrical scheme, based on a two-band Dirac model, that can switch the fully valley-polarized photocurrent between K and K' valleys using the circular bulk electro-photovoltaic effect. This is accomplished by applying an out-of-plane electric field to the two-dimensional valley materials, which enables continuous tuning of the Berry curvature and its sign flip. We found that the switch of the fully valley-polarized photocurrent is directly tied to the sign change of Berry curvature, which accompanies a topological phase transition, for instance, the quantum spin Hall effect and the quantum valley Hall effect. This scheme has been confirmed in monolayer BiAsI2 and germanene through first-principles calculations. Our paper offers a promising strategy for the development of a volatile valley-addressable memory device and could inspire further research in this area.
- Subjects :
- Condensed Matter - Mesoscale and Nanoscale Physics
Subjects
Details
- Database :
- arXiv
- Journal :
- Phys. Rev. B 109, 235403 (2024)
- Publication Type :
- Report
- Accession number :
- edsarx.2406.08768
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1103/PhysRevB.109.235403