Investigation of electron correlation effects in armchair silicene nanoribbons

Q: How can I download an article?

To download an article from SID, first log in to the site, search for the article title, and click on the 'Download Article' option.

Q: How can I download an ISI article?

To download an ISI article on SID, enter the keyword or article title in the search bar, view the relevant results, click on the desired article, and select the 'Download Article' option.

Q: How can I access the SID database?

To access the SID database, visit SID.ir, create an account, and log in to access scientific resources.

Q: Is downloading articles from SID free?

Some articles on SID are available for free, while others require payment. Details are specified on the article's page.

Bagherpour f.; Abediravan b.

مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

Journal Paper

Paper Information

Journal: Iranian Journal of Physics Research Year:2019 | Volume:19 | Issue:1 Page(s): 49-59

Download Full-Text

Persian Verion

View:

405

Download:

Cites:

Information Journal Paper

Title

Investigation of electron correlation effects in armchair silicene nanoribbons

Author(s)

Bagherpour f. | Abediravan b. | Issue Writer Certificate

Keywords

armchair silicene nanoribbonsQ1

cRPAQ1

density functional theoryQ2

Hubbard UQ1

electronic correlationQ2

Abstract

In this study, the electronic structure of armchair silicene nanoribbons (ASiNRs) is investigated for various widths using first-principle calculations and the framework of the density functional theory. Electronic structure of ASiNRs shows a direct band gap which is decreased with increasing the nanoribbon's width, showing an oscillatory behavior. The eﬀ ective Coulomb interaction between localized electrons plays an important role in describing the reason underlying the electronic and magnetic ordering of the material, as well as the intensity of the correlation eﬀ ects. Thus, we further investigate the screening of the Coulomb interaction in ASiNRs by employing ab initio calculations in conjunction with the constrained random-phase approximation (cRPA) and determine the values of eﬀ ective on-site Coulomb interaction (Hubbard U) for them. The values of Hubbard U parameters for ASiNRs are significant and more than the ones in pristine silicene, indicating a strong correlation effect in these compounds. According to the intensity of different quantum confinement effects in these nanoribbons, the values of on-site Coulomb interaction parameters, similar to the previous results, turn out to be small, which vary as a function of increasing the ribbon widths. Moreover, in the edge of nanoribbon, the eﬀ ective Coulomb interaction patameters are greater than the inner parts, showing the lower screening of the Coulomb interaction between the localized electrons in the edge of nanoribbon. Finally, the results of the study of the off-site Coulomb interaction show that the Coulomb interaction is weakly screened at short distances, while at large distances if about 12 Å , it is unscreened, which is in a good agreement with the recent studies on the low dimensional systems. This ineﬃ cient screening at large distances can explain the existence of a remarkable quasiparticles correction in GW approximation and exciton binding energy in ASiNRs.

Cites

No record.

References

No record.

Cite

APA: Copy

Bagherpour, f., & Abediravan, b.. (2019). Investigation of electron correlation effects in armchair silicene nanoribbons. IRANIAN JOURNAL OF PHYSICS RESEARCH, 19(1 ), 49-59. SID. https://sid.ir/paper/1456/en

Vancouver: Copy

Bagherpour f., Abediravan b.. Investigation of electron correlation effects in armchair silicene nanoribbons. IRANIAN JOURNAL OF PHYSICS RESEARCH[Internet]. 2019;19(1 ):49-59. Available from: https://sid.ir/paper/1456/en

IEEE: Copy

f. Bagherpour, and b. Abediravan, “Investigation of electron correlation effects in armchair silicene nanoribbons,” IRANIAN JOURNAL OF PHYSICS RESEARCH, vol. 19, no. 1 , pp. 49–59, 2019, [Online]. Available: https://sid.ir/paper/1456/en

Related Journal Papers