| Autor: |
Thomas Garm Pedersen, Christian Fisker, Abbas Zarifi |
| Jazyk: |
angličtina |
| Rok vydání: |
2007 |
| Předmět: |
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| Zdroj: |
Zarifi, A, Fisker, C & Pedersen, T G 2007, ' Theoretical study of quadratic electro-optic effect in semiconducting zigzag carbon nanotubes ', Physical Review B. Condensed Matter and Materials Physics, vol. 76, no. 4, pp. art.no. 045403 . < http://scitation.aip.org/dbt/dbt.jsp?KEY=PRBMDO&Volume=76 > |
| Popis: |
Using the perturbation treatment developed by Aspnes and Rowe [Phys. Rev. B 5, 4022 (1972)], an analytic expression for the third-order nonlinear optical susceptibility ${\ensuremath{\chi}}^{(3)}(\ensuremath{\omega};0,0,\ensuremath{\omega})$ is computed and analyzed for single walled zigzag carbon nanotubes. By improving their method, our calculations based on a tight-binding model take into account the transitions between all pairs of valence and conduction bands and thereby the contributions to the third-order susceptibility associated with different energy bands are investigated. With increasing radius of the nanotube, a nonmonotonous increase of the quadratic electro-optic effect has been demonstrated except for the fundamental peak. The nonuniformity is a result of the overlap between two energy bands as well as the reduced effective masses associated with each pair of conduction and valence bands. A nonperturbative numerical calculation is applied to obtain the high-field response as well as to assess the applicability of the low-field perturbation expression. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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