研究目的
Investigating the effect of magnetic field on terahertz photoconductivity in Hg1-xCdxTe solid solutions in a topological phase.
研究成果
The positive terahertz photoconductivity in Hg1-xCdxTe solid solutions in a topological phase (x < 0.16) has practically no low energy threshold and strongly depends on the combination of both the external magnetic field direction and the potential probe position. The asymmetry in the photoresponse may be due to the spin-related features of the surface carriers excited.
研究不足
The study does not discuss the long-term photoconductivity observed after the laser pulse end, focusing only on relatively fast processes with characteristic times ~200 ns.
1：Experimental Design and Method Selection:
The study involved measuring the photoconductivity kinetics in Hg1-xCdxTe films under different magnetic field directions and potential probe positions.
2：Sample Selection and Data Sources:
Hg1-xCdxTe films of ~5 μm thickness deposited on a semi-insulating GaAs (013) substrate with ZnTe and CdTe buffer layers by molecular beam epitaxy.
3：List of Experimental Equipment and Materials:
Pulsed laser radiation with wavelengths 280 μm and 496 μm, magnetic field up to 4 T, Hall bar samples.
4：Experimental Procedures and Operational Workflow:
Photoconductivity measurements were performed in the Faraday geometry at T =
5：2 K. Data Analysis Methods:
Analysis of photoconductivity kinetics and its dependence on magnetic field direction and potential probe position.
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