Microwave-enhanced dephasing time in a HgCdTe film

The antilocalization effect in a compensated HgCdTe film is observed. With an applied microwave field, both the zero-magnetic-field conductance and the dephasing time are enhanced nonlinearly with microwave power. The observation concerning the dephasing time is inconsistent with a heating mechanism. Such behavior is also in contrast to the microwave-induced suppression of weak-antilocalization and dephasing time seen for a two-dimensional electron gas of the anodic-oxidized HgCdTe. The nonlinear increase in zero-magnetic-field conductance is consistent with a microwave-assisted-hopping mechanism. The increased dephasing time can be explained qualitatively by the microwave-assisted-hopping mechanism and a microwave-induced increase in the electron density.