Fig. 2

Transmission spectra (a) crosses, (b) add two patches, (c) add four patches. Here, chemical potential of layers is \(\:{{\upmu\:}}_{c1}\)=1.1eV, \(\:{{\upmu\:}}_{c2}\)=0.9eV, \(\:{{\upmu\:}}_{c3}\)=0.7eV, \(\:{{\upmu\:}}_{c4}\)=1.2eV, \(\:{{\upmu\:}}_{c5}\)=0.6eV, \(\:{{\upmu\:}}_{c6}\)=1eV, \(\:{{\upmu\:}}_{c7}\)= 1.3Â eV from left to right respectively.