Magnetointersubband scattering oscillations of two-dimensional electron gas in Al/sub x/Ga/sub 1-x/N/GaN heterostructures

Abstract

Magnetointersubband scattering (MIS) oscillations of two-dimensional electron gas (2DEG) in unintentionally doped Al/sub 0.22/Ga/sub 0.78/N/GaN heterostructures have been investigated by means of magnetotransport measurements at low temperatures and high magnetic fields. It is found that the MIS oscillations become slightly weaker with increasing temperature and become dominant with increasing temperature. Due to the different temperature dependence between the Shubnikov-de Haas (SdH) and the MIS oscillations, it is observed that the SdH oscillations modulated strongly by the MIS oscillations between 10 K and 17 K while the modulations are very weak at other temperatures.