However the bandgap is as large as 800mV due to the large spin - orbit - coupling of the Bi atoms and their interaction with the substrate .
At first glance the system is similar to graphene , as the Bi atoms arrange in a honeycomb lattice .
The bandgap is as large as 800mV due to the large spin - orbit - coupling of the Bi atoms and atoms ' interaction with the substrate .
At first glance the system is similar to graphene , as the Bi atoms arrange in a honeycomb lattice .