Terahertz spectroscopy study of the topological insulator Bi2Se3 thin film
Topological insulators are a distinct class of materials with insulating bulk states and conducting surface states, and they are a major focus for research in Condensed Matter Physics. In this project, a topological insulator, Bi2Se3 thin film, is grown by molecular beam epitaxy (MBE) which is 32 QL...
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sg-ntu-dr.10356-679682023-02-28T23:15:19Z Terahertz spectroscopy study of the topological insulator Bi2Se3 thin film Ng, Yi Ming Chia Ee Min, Elbert School of Physical and Mathematical Sciences DRNTU::Science::Physics::Optics and light DRNTU::Science::Physics::Atomic physics::Solid state physics Topological insulators are a distinct class of materials with insulating bulk states and conducting surface states, and they are a major focus for research in Condensed Matter Physics. In this project, a topological insulator, Bi2Se3 thin film, is grown by molecular beam epitaxy (MBE) which is 32 QL thick. It is investigated using Terahertz-Time Domain Spectroscopy (THz-TDS). Bi2Se3 has been around since the 1950s and it is only until recently that more attention was paid to it as a topological insulator. It shows particular promise for technological applications such as a THz photodetector. The temperature dependence (15 – 300 K) of the optical conductivity was obtained for a range of spectroscopic frequencies (0.5 – 2.5 THz) and fitted to a Drude-Lorentz model. The Drude response was attributed to the presence of the surface states in Bi2Se3, and the Lorentz response was attributed to the semiconductor nature of the bulk state of Bi2Se3. Bachelor of Science in Physics 2016-05-23T08:50:47Z 2016-05-23T08:50:47Z 2016 Final Year Project (FYP) http://hdl.handle.net/10356/67968 en 55 p. application/pdf |
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DRNTU::Science::Physics::Optics and light DRNTU::Science::Physics::Atomic physics::Solid state physics Ng, Yi Ming Terahertz spectroscopy study of the topological insulator Bi2Se3 thin film |
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Topological insulators are a distinct class of materials with insulating bulk states and conducting surface states, and they are a major focus for research in Condensed Matter Physics. In this project, a topological insulator, Bi2Se3 thin film, is grown by molecular beam epitaxy (MBE) which is 32 QL thick. It is investigated using Terahertz-Time Domain Spectroscopy (THz-TDS). Bi2Se3 has been around since the 1950s and it is only until recently that more attention was paid to it as a topological insulator. It shows particular promise for technological applications such as a THz photodetector.
The temperature dependence (15 – 300 K) of the optical conductivity was obtained for a range of spectroscopic frequencies (0.5 – 2.5 THz) and fitted to a Drude-Lorentz model. The Drude response was attributed to the presence of the surface states in Bi2Se3, and the Lorentz response was attributed to the semiconductor nature of the bulk state of Bi2Se3. |
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Chia Ee Min, Elbert |
author_facet |
Chia Ee Min, Elbert Ng, Yi Ming |
format |
Final Year Project |
author |
Ng, Yi Ming |
author_sort |
Ng, Yi Ming |
title |
Terahertz spectroscopy study of the topological insulator Bi2Se3 thin film |
title_short |
Terahertz spectroscopy study of the topological insulator Bi2Se3 thin film |
title_full |
Terahertz spectroscopy study of the topological insulator Bi2Se3 thin film |
title_fullStr |
Terahertz spectroscopy study of the topological insulator Bi2Se3 thin film |
title_full_unstemmed |
Terahertz spectroscopy study of the topological insulator Bi2Se3 thin film |
title_sort |
terahertz spectroscopy study of the topological insulator bi2se3 thin film |
publishDate |
2016 |
url |
http://hdl.handle.net/10356/67968 |
_version_ |
1759855810784002048 |