We have determined the dephasing time for the two-dimensional electron gas on the surface of a H₂ crystal from low-field magnetoresistance measurements. We find that a moderate amount of helium gas above the H₂ surface causes large increases in resistivity, but unexpectedly small negative magnetoresistance effects. We attribute this to a suppression of weak localization as a result of the dephasing effect of the thermal motion of helium atoms normal to the H₂ surface.
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Adams et al. (1989) studied this question.
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