Issue |
EPL
Volume 148, Number 1, October 2024
|
|
---|---|---|
Article Number | 16001 | |
Number of page(s) | 7 | |
Section | Condensed matter and materials physics | |
DOI | https://doi.org/10.1209/0295-5075/ad7be8 | |
Published online | 01 October 2024 |
Infrared optical spectra of a silicene quantum dot modulated by spin-orbit coupling and uniaxial strain
1 School of Physics Science and Technology, Kunming University - Kunming 650214, China
2 School of Electronic Engineering, Nanjing Xiaozhuang University - Nanjing 211171, China
3 National Laboratory of Solid State Microstructures, Department of Physics, and Collaborative Innovation Center of Advanced Microstructures, Nanjing University - Nanjing 210093, China
Received: 10 May 2024
Accepted: 17 September 2024
We theoretically study the electronic structure and light absorption spectra of a triangular silicene quantum dot (TZSQD) modulated by spin-orbit coupling (SOC) and the uniaxial strain from a symmetry point of view. After considering the SOC, the symmetry of the system decreases and the degenerate energy level split, creating the absorption peaks in the far-infrared region and some multimodal structures in the near-infrared region and visible region. In addition, the intensity of the SOC also affects the degree of splitting of the energy levels, which makes the absorption peaks in the far-infrared region blueshift to the mid-infrared region, and absorption edge in the near-infrared region redshift to the mid-infrared region. We also find that when a uniaxial strain and SOC coexist at the same time, the symmetry of the system is further reduced and the number of absorption peaks is increased. Moreover, the uniaxial strain intensity can efficiently regulate the frequency position of the absorption edge in the near-infrared region, and make its spectral range greatly expanded.
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