Optical spectra of bi2se3: The effects of electron-hole interactions

Desy Nicola Asturo, Ahmad Syahroni, Muhammad Aziz Majidi

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

Bi2Se3 as a well-known topological insulator has become the focus of research especially on its transport properties. It is a narrow band gap semiconductor with conducting states on its surface. However, studies on its optical spectra, including excitonic effects, are very limited for this material. One of the reasons may be that such calculations are rather computationally demanding. In this work, we use density functional theory (DFT) as implemented in Quantum Espresso package to calculate the ground state properties of this material. We also calculate its optical spectra using Yambo code. As we are interested in exploring the excitonic effects, we incorporate electron-hole interactions by solving the Bethe-Salpeter equation. To obtain accurate results with inexpensive calculations we implement a double-grid method in dealing with k-point integration. Assuming that electron-electron interaction is effectively screened in this system, we do not treat the electron-electron interaction beyond the exchange-correlation functional within the DFT.

Original languageEnglish
Title of host publicationFunctional Properties of Modern Materials II
EditorsBudhy Kurniawan, Agustinus Agung Nugroho, Darminto, Isao Watanabe, Risdiana
PublisherTrans Tech Publications Ltd
Pages489-493
Number of pages5
ISBN (Print)9783035714968
DOIs
Publication statusPublished - 1 Jan 2019
Event4th International Conference on Functional Materials Science, ICFMS 2018 - Bali, Indonesia
Duration: 13 Nov 201815 Nov 2018

Publication series

NameMaterials Science Forum
Volume966 MSF
ISSN (Print)0255-5476

Conference

Conference4th International Conference on Functional Materials Science, ICFMS 2018
CountryIndonesia
CityBali
Period13/11/1815/11/18

Keywords

  • Bethe-Salpeter
  • BiSe
  • DFT
  • Double-grid
  • Electron-hole interaction

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