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Terahertz photoconductivity of a two‐dimensional electron gas in HgCdTe/HgTe quantum wells
Author(s) -
Vasilyev Yu. B.,
Gouider F.,
Bugár M.,
Nachtwei G.,
Könemann J.,
Brüne C.,
Buhmann H.
Publication year - 2010
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200983180
Subject(s) - terahertz radiation , photoconductivity , quantum well , wavelength , optoelectronics , electron , fermi gas , excited state , laser , materials science , radiation , cyclotron , optics , physics , atomic physics , quantum mechanics
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.