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The magneto-photoluminescence emission of a high mobility electron gas in a GaAs/GaAlAs single hetero-structure shows a remarkable behavior near filling factor 2. The emission of the electron gas starts abruptly at ν=2 in a field range narrower than 1mT and shows a hysteresis cycle of 25–30mT. At low temperatures the emission energy remains essentially field-independent below ν=2 up to a critical...
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