Gate-tunable valley-filter based on suspended graphene with double magnetic barrier structures
| Autor: | Nojoon Myoung, Gukhyung Ihm |
|---|---|
| Rok vydání: | 2014 |
| Předmět: |
Materials science
Condensed matter physics Graphene Magnetic barrier General Physics and Astronomy Condensed Matter::Mesoscopic Systems and Quantum Hall Effect Polarization (waves) Ballistic conductance law.invention symbols.namesake Strain engineering Dirac fermion law symbols General Materials Science Quantum tunnelling |
| Zdroj: | Current Applied Physics. 14:1455-1459 |
| ISSN: | 1567-1739 |
| DOI: | 10.1016/j.cap.2014.08.004 |
| Popis: | We theoretically investigate the effects of strain-induced pseudomagnetic fields on the transmission probability and the ballistic conductance for Dirac fermion transport in suspended graphene. We show that resonant tunneling through double magnetic barriers can be tuned by strain in the suspended region. The valley-resolved transmission peaks are apparently distinguishable owing to the sharpness of the resonant tunneling. With the specific strain, the resonant tunneling is completely suppressed for Dirac fermions occupying the one valley, but the resonant tunneling exists for the other valley. The valley-filtering effect is expected to be measurable by strain engineering. The proposed system can be used to fabricate a graphene valley filter with the large valley polarization almost 100%. |
| Databáze: | OpenAIRE |
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