Strong localization in a suspended monolayer graphene by intervalley scattering
arXiv:2006.11797 · doi:10.1103/PhysRevB.103.085437
Abstract
A gate induced insulating behavior at zero magnetic field is observed in a high mobility suspended monolayer graphene near the charge neutrality point. The graphene device initially cleaned by a current annealing technique was undergone a thermo-pressure cycle to allow short range impurities to be adsorbed directly on the ultra clean graphene surface. The adsorption process generated a strong temperature and electric field dependent behavior on the conductance of the graphene device. The conductance around the neutrality point is observed to be reduced from around at 30 K to at 20 mK. A direct transition from insulator to quantum Hall conductor within accompanied by broken-symmetry-induced plateaux confirms the presence of intervalley scatterers.
arXiv comment4 pages, 4 figures
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