Guidinghyphen;centerhyphen;drift resonance of twohyphen;dimensional electrons in a gridhyphen;gate superlattice potential

摘要

We have studied the lowhyphen;field magnetoresistance of the twohyphen;dimensional electron gas in GaAs/m1;amp;33AlxGa1minus;xAs in the presence of a twohyphen;dimensional lateral surface superlattice (2D LSSL) potential, and observed, for the first time, the guidinghyphen;center drift resonance, previously reported for onehyphen;dimensional LSSL structures. The 2D LSSL potential is created by applying a voltageVgto a 200 nm period gridhyphen;gate structure fabricated on top of the sample and can be tuned continuously from being repulsive to attractive by tuningVg.