Onset of subband locking in double-quantum-well structures as the signature of wave function delocalization

Anomalous integer quantum Hall states in coupled double quantum wells and the effect of Landau level broadening

“…As will be discussed further in later sections, this is a result of the charge associated with the two subbands occupying the same physical space because their wavefunctions are delocalized across the DQW. As such, it is incorrect to regard the two subbands as being independent of one another and the CDQW behaves as if it were a single 2DEG [1,2,12]. The magnetic field thus causes a transition from bilayer characteristics at low magnetic fields to single layer behaviour at high fields.…”

“…Studies utilizing single [13], single wide [14], parabolic [15] and double [2,12] QWs have shown that both the magneto-transport and optical characteristics can deviate from the anticipated behaviour as charge is redistributed between subbands. Clearly an appropriate consideration of the wavefunction de-localization must be formulated for CDQWs in which the stability (off resonance) and even the absence (on resonance) of QH states could be an artifact of the density of states' (DoS's) quantization in a coupled 2DEG system.…”