Abstract
Transport properties of highly mobile two-dimensional (2D) electrons in symmetric GaAs quantum wells with two populated subbands placed in tilted magnetic fields are studied at high temperatures. Quantum positive magnetoresistance (QPMR) and magneto-intersubband resistance oscillations (MISO) are observed in quantizing magnetic fields, ${B}_{\ensuremath{\perp}}$, applied perpendicular to the 2D layer. QPMR displays contributions from electrons with considerably different quantum lifetimes, ${\ensuremath{\tau}}_{q}^{(1,2)}$, confirming the presence of two subbands in the studied system. MISO evolution with ${B}_{\ensuremath{\perp}}$ agrees with the obtained quantum scattering times only if an additional reduction of the MISO magnitude is applied at small magnetic fields. This indicates the presence of a yet unknown mechanism leading to MISO damping. Application of an in-plane magnetic field produces a strong decrease of both QPMR and MISO magnitude. The reduction of QPMR is explained by spin splitting of Landau levels indicating a $g$ factor, $g\ensuremath{\approx}0.4$, which is considerably less than the $g$ factor found in GaAs quantum well with a single subband populated. In contrast to QPMR, the decrease of MISO magnitude is largely related to the in-plane magnetic field induced entanglement between quantum levels in different subbands that, in addition, increases the MISO period.
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