太赫兹和红外等离子极子在PtTe2的II型迪拉克拓半金属
Salvatore Macis1, Annalisa D'Arco1, Lorenzo Mosesso1
1Department of Physics, Sapienza University, Piazzale Aldo Moro 5, Rome, 00185, Italy.
Advanced materials (Deerfield Beach, Fla.)
|May 11, 2024
概括
二甲 (PtTe2) 拓半金属薄膜使可调的表面等离子极子子 (SPPs) 能够用于红外和太赫兹应用. 这些发现为新型光学调节材料在苛刻的光谱范围内铺平了道路.
科学领域:
- 凝聚物质物理学 凝聚物质物理学
- 材料科学是一种材料科学.
- 纳米光子学 纳米光子学
背景情况:
- 表面等离子极子子 (SPPs) 对于纳米光子设备中的光操纵至关重要.
- 拓半金属为先进的光学应用提供独特的电子特性.
- 非传统材料正在扩大SPP研究的范围,包括红外 (IR) 和太赫兹 (THz) 频率.
研究的目的:
- 为了研究二甲 (PtTe2) 类型II迪拉克拓半金属膜的THz-IR光学反应.
- 探索在PtTe2微尺度带阵列上生成和检测SPPs.
- 为了证明PtTe2在THz和IR频谱中用于几何调节的SPP的潜力.
主要方法:
- 在基板上制造PtTe2薄膜.
- 通过微尺度的带阵列在远场中实验检测SPPs.
- 近场红外光谱测试以确认电场增强.
- 与理论模型和电磁模拟进行比较.
主要成果:
- 在THz-IR范围内的PtTe2微尺度带阵列上成功生成和检测了SPP.
- 实验结果与理论模型和模拟非常一致.
- 近场数据证实了由于SPP激发,在带边缘显著增强电场.
- PtTe2 带阵列展示了可以通过几何调节的 SPP 特性.
结论:
- PtTe2作为支持拓保护的SPP的有希望的材料.
- PtTe2 带阵列是几何调节 SPP 的有效平台.
- 这项研究为THz和IR频谱中的光学调节材料开辟了新的途径.
更多相关视频
相关概念视频
01:20¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)
1.0K
When proton-coupled carbon-13 spectra are simplified by a broadband proton decoupling technique, structural information about the coupled protons is lost. Distortionless enhancement by polarization transfer (DEPT) is a technique that provides information on the number of hydrogens attached to each carbon in a molecule. While the DEPT experiment utilizes complex pulse sequences, the pulse delay and flip angle are specifically manipulated. The resulting signals have different phases depending on...
1.0K
01:18Fermi Level
575
The Fermi-Dirac function is represented by an S-shaped curve indicating the probability of an energy state being occupied by an electron at a given temperature. The Fermi level is the energy level at which there is a fifty percent chance of finding an electron, and it is positioned between the lower-energy valence band and the higher-energy conduction band.
At absolute zero temperature, electrons fill all energy states up to the Fermi level, leaving upper states empty. As the temperature rises,...
At absolute zero temperature, electrons fill all energy states up to the Fermi level, leaving upper states empty. As the temperature rises,...
575
01:14π Electron Effects on Chemical Shift: Aromatic and Antiaromatic Compounds
1.2K
In aromatic compounds, such as benzene, the circulation of (4n + 2) π-electrons sets up a diamagnetic or diatropic ring current around the perimeter of the molecule. This current induces a magnetic field that opposes the external field inside the ring and reinforces it on the outside. The protons in benzene are deshielded and exhibit high chemical shifts in the range 6.5–8.5 ppm. The shielding effect at the center of the ring is evident in complex aromatic molecules, such as...
1.2K
01:15Insensitive Nuclei Enhanced by Polarization Transfer (INEPT)
298
Insensitive Nuclei Enhanced by Polarization Transfer (INEPT) is an advanced Nuclear Magnetic Resonance (NMR) technique specifically designed to detect and enhance the signals of low-abundance nuclei, such as carbon-13 and nitrogen-15, in small molecules. The fundamental principle behind INEPT is the transfer of polarization from a more abundant and highly polarizable nucleus, typically hydrogen-1, to the low-abundance nucleus of interest. This process effectively boosts the NMR signal of the...
298
02:46Crystal Field Theory - Tetrahedral and Square Planar Complexes
42.4K
Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
42.4K
01:20Types of Semiconductors
588
Intrinsic semiconductors are highly pure materials with no impurities. At absolute zero, these semiconductors behave as perfect insulators because all the valence electrons are bound, and the conduction band is empty, disallowing electrical conduction. The Fermi level is a concept used to describe the probability of occupancy of energy levels by electrons at thermal equilibrium. In intrinsic semiconductors, the Fermi level is positioned at the midpoint of the energy gap at absolute zero. When...
588