Abstract
The terahertz (THz) photoconductivity is investigated in HgTe/HgCdTe‐quantum wells (QWs) in Corbino geometry at various wavelengths of excited radiation. The radiation source is a p‐Ge cyclotron laser (pulse width about 1 µs, repetition rate 1 Hz) which is tunable in the wavelength range 120 µm < λ < 180 µm by an external magnetic field. It is shown that the photoconductivity is caused by the heating of two‐dimensional electron gas (2DEG). A rough estimation yields relaxation time around 0.46 µs. Because of the low effective mass, this material system is especially interesting for detector applications.
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