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| Content Provider | Royal Society of Chemistry (RSC) |
|---|---|
| Author | Shao, J. M. Yang, G. W. Li, H. |
| Copyright Year | 2014 |
| Abstract | Strong optical absorbance makes topological insulator (TI) surfaces a promising high-performance photodetector in the terahertz (THz) to infrared frequency range. Here, we study the optical absorbance of more realistic TI films with hexagonal warping effect using the Fermi's golden rules. It was found that when the warping term is λ ≠ 0, the absorbance is no longer a universal value as that of graphene or ideal Dirac cone, but increases monotonously with the photon energy. The increment is positively correlated with the parameter λ/vF3 where vF is the Fermi velocity. The relative signal-to-noise ratio (SNR) of the TI film working as a photoresistor-type photodetector is significantly enhanced by the warping effect-induced absorbance increment. These investigations provide useful information for developing TI-based photodetectors with high SNR in the range of THz to infrared frequency. |
| Starting Page | 3513 |
| Ending Page | 3517 |
| Page Count | 5 |
| File Format | HTM / HTML PDF |
| ISSN | 20403364 |
| Volume Number | 6 |
| Issue Number | 7 |
| Journal | Nanoscale |
| DOI | 10.1039/c3nr06506e |
| Language | English |
| Publisher | Royal Society of Chemistry |
| Access Restriction | Open |
| Subject Keyword | Dirac Texas Instruments Topological insulator Paul Dirac Richard Tomlinson Infrared Graphene Fermi energy Terahertz radiation Signal-to-noise ratio Photodetector Photon |
| Content Type | Text |
| Resource Type | Article |
| Subject | Nanoscience and Nanotechnology |
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