研究目的
Investigating the magnetoabsorption and Faraday rotation spectra in HgTe/CdHgTe heterostructures with single and double quantum wells to identify intraband and interband transitions between Landau levels.
研究成果
Faraday rotation spectra provide additional information that simplifies the interpretation of transitions between Landau levels observed in magnetoabsorption spectra, particularly in studies of double quantum wells and interband transitions.
研究不足
The interpretation of complex magnetoabsorption spectra is complicated by the overlapping or closeness of transition energies, especially in double quantum wells where the number of Landau levels is 'doubled'.
1：Experimental Design and Method Selection:
The study employed Fourier-transform spectroscopy to measure magnetoabsorption and Faraday rotation spectra in high magnetic fields up to 11 T. The method involved using linear polarizers to determine the angle of rotation of the plane of polarization.
2：Sample Selection and Data Sources:
Samples with single and double HgTe/CdHgTe quantum wells were grown by molecular beam epitaxy on GaAs substrates. The structures were not specially doped and had a p-type conductivity.
3：List of Experimental Equipment and Materials:
A superconducting solenoid was used to produce magnetic fields up to 11 T. A Globar served as a radiation source, and KBr or Mylar multilayer beam splitters were used. Samples were placed in liquid helium, and transmitted radiation was detected by a composite bolometer.
4：Experimental Procedures and Operational Workflow:
Transmission spectra were measured in the Faraday geometry and normalized to the spectrum recorded in the absence of a magnetic field. The Faraday effect was measured using grid polarizers.
5：Data Analysis Methods:
The magnetoabsorption spectra were approximated by a sum of Lorentzians to determine the position, width, and area of each peak. The Faraday rotation spectra were analyzed to determine the sign of resonance circular polarization.
独家科研数据包，助您复现前沿成果，加速创新突破
获取完整内容
