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Drude-Lorentz Analysis of the Optical Properties of the Quasi-Two-Dimensional Dichalcogenides 2H-NbSe2 and 2H-TaSe2

Marasinghe Mudiyanselage, Dinesh Marasinghe
http://rave.ohiolink.edu/etdc/view?acc_num=akron1533720402564107

Abstract Details

2018, Master of Science, University of Akron, Physics.
The reflectivity of a material basically depends on the collisions of free electrons. Existing spectroscopic reflectance data of two dichalcogenide materials, 2H-NbSe2 and 2H-TaSe2, is studied in this work. We analyzed this information with the Drude-Lorentz model for 2D electron gases. Using the program RefFIT, we explored the materials' reflectance and the conductivity and their dependance on temperature across frequencies ranging from infrared to ultraviolet. We examined both the in-plane (ab-plane) and out-of-plane (c-axis) components. In both materials, the ab-plane had greater reflectance and conductivity, with 2H-NbSe2 having the largest of both quantities. The anisotropy-direction dependence-effects are most pronounced in 2H-TaSe2. When frequency increased, collisions of free elections increased, decreasing the reflectance and conductivity. We also determined that the reflectance and the conductivity of the materials decreased with increased temperature for the same reason. Once the plasma edge was reached, interband transition occurred, causing an increase in conduction electrons and a decrease in both reflectance and conductivity.
Sasa Dordevic, PhD (Advisor)
Ben Yu-Kuang Hu, PhD (Committee Member)
Sergei Lyuksyutov, PhD (Committee Member)
74 p.
Condensed Matter Physics; Physics
Drude-Lorentz model; Optical Properties; Dichalcogenides; 2H-NbSe2; 2H-TaSe2; conductivity; reflectance

Recommended Citations

Citations

  • Marasinghe Mudiyanselage, D. M. (2018). Drude-Lorentz Analysis of the Optical Properties of the Quasi-Two-Dimensional Dichalcogenides 2H-NbSe2 and 2H-TaSe2 [Master's thesis, University of Akron]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=akron1533720402564107

    APA Style (7th edition)

  • Marasinghe Mudiyanselage, Dinesh Marasinghe. Drude-Lorentz Analysis of the Optical Properties of the Quasi-Two-Dimensional Dichalcogenides 2H-NbSe2 and 2H-TaSe2. 2018. University of Akron, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=akron1533720402564107.

    MLA Style (8th edition)

  • Marasinghe Mudiyanselage, Dinesh Marasinghe. "Drude-Lorentz Analysis of the Optical Properties of the Quasi-Two-Dimensional Dichalcogenides 2H-NbSe2 and 2H-TaSe2." Master's thesis, University of Akron, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=akron1533720402564107

    Chicago Manual of Style (17th edition)

akron1533720402564107
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© 2018, some rights reserved.Creative Commons License Drude-Lorentz Analysis of the Optical Properties of the Quasi-Two-Dimensional Dichalcogenides 2H-NbSe2 and 2H-TaSe2 by Dinesh Marasinghe Marasinghe Mudiyanselage is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License. Based on a work at etd.ohiolink.edu.
This open access ETD is published by University of Akron and OhioLINK.