Magneto-transport Spectroscopy of the First and Second Two-dimensional Subbands in Al_0.25Ga_0.75N/GaN Quantum Point Contacts.

ABSTRACT: Magnetic transport spectroscopy is investigated in quantum point contacts (QPCs) fabricated in Al_0.25Ga_0.75N/GaN heterostructures. The magnetic field perpendicular to the two-dimensional electron gas (2DEG) is shown to depopulate the quasi-one-dimensional energy levels in the first two-dimensional (2D) subband faster than those in the second one. In GaN based heterostructures, the energy levels in the second 2D subband is generally concealed in the fast course of depletion and hence rarely detected. The perpendicular magnetic field facilitates the observation of the second 2D subband, and provides a method to study the properties of these energy levels. A careful analysis on the rate of the magnetic depletion with respect to the level index and confinement is carried

SUBMITTER: Lu F 

PROVIDER: S-EPMC5320474 | biostudies-literature | 2017 Feb

REPOSITORIES: biostudies-literature