Temperature damping of magneto-intersubband resistance oscillations in magnetically entangled subbands

Magneto-intersubband resistance oscillations (MISO) of highly mobile 2D electrons in symmetric GaAs quantum wells with two populated subbands are studied magnetic fields tilted from the normal to electron layer at different temperatures $T$. Decrease MISO amplitude temperature increase is observed. At moderate tilts decrease consistent Dingle factor due reduction lifetime high temperatures. large new regime strong suppression Proposed model relates this entanglement between subbands, leading beating oscillating density states. The yields corresponding damping factor: $A_{MISO}(T)=X/\sinh(X)$, where $X=2\pi^2kT\delta f$ and $\delta difference frequency states subbands. This agreement experiment. Fermi liquid enhancement