AC driven zero-resistance states and oscillatory magnetoresistance in GaAs/AlGaAs devices
Novel zero resistance states are induced by electromagnetic wave excitation in ultra high modility GaAs/AlGaAs heterostructure devices at low magnetic fields. Zero-resistance states occur about B=(4/5)Bf and B=(4/9)Bf, where Bf=2?fm*/e, m* is an electron effective mass, e is electron charge, and f is the radiation frequency. Surprisingly, the absence of backscattering appears to be associated with an ordinary Hall effect here, unlike the typical quantum Hall situation.
zero-resistance states gaas/algaas microwave quantum hall effect