This equation shows the physical equivalence to a situation with only one scattering time and two different oscillations frequencies for the MW-driven subbands: w/3 for the intra-subband and w for the inter-subband scattering rate [32, 33]. They demonstrate also the origin for the regular and strong interference profile observed in experiments where the factor 1/3 is essential to obtain the interference effect regularly spaced affecting only valleys and peaks.

A different factor would produce a totally distinct interference and also distinct R x x response. This factor comes from the calculation of the squared magnitude of the corresponding form factors which eventually determine the different scattering rates between the intra-subband and the inter-subband processes. MI-503 cost In physical terms,during the scattering jump, the electron perceives approximately three PF 01367338 times faster MW-driven oscillation

of the 2DES when is inter-subband with respect to the intra-subband. Then, we are going to obtain a MIRO profile made up of two different MW frequencies, as if the sample was illuminated by two different radiation sources at the same time. This gives rise to a clear interference effect reflected in the final R x x profile. To obtain R x x , we use the relation , where and σ x x ≪σ x y . In Figure 1, we present calculated R x x vs B for dark and MW situations and frequency f=w/2π=100 GHz. We can observe MISO peaks for the dark curve, MIRO for the MW curve, and the ZRS marked with an arrow. We observe the new features appearing regularly spaced in peaks and valleys for bilayer systems: two nearly symmetric shoulders in valleys and narrower peaks with respect to the single occupied subband case (see inset). According to our model, these new features

are results of the interference between the competing intra- and inter-subband scattering processes. In valleys, we observe a constructive interference Tacrolimus (FK506) effect giving rise to two shoulders, meaning more current through the sample; meanwhile, the narrower peaks mean a destructive interference and less current. Figure 1 Calculated R xx vs B for dark (no MW) and MW situations. The ZRS is marked with an arrow. The MW frequency is 100 GHz. We observe clearly the peculiar features for bilayer systems: shoulders at minima and narrower peaks regarding the single occupied subband case (see inset). Shoulders and narrow peaks are the outcomes of the interference between the intra- and inter-subband scattering processes. Conclusions In summary, we have theoretically studied the recently discovered microwave-induced resistance oscillations and zero resistance states in Hall bars with bilayer systems. Resistance presents a peculiar shape which appears to have an interference effect not observed before.