论文标题
Intervalley散射在悬浮的单层石墨烯中的强烈定位
Strong localization in a suspended monolayer graphene by intervalley scattering
论文作者
论文摘要
在电荷中性点附近的高迁移率悬浮单层石墨烯中观察到栅极诱导的绝缘行为。最初通过当前退火技术清洁的石墨烯设备经过了热压周期，以使短距离杂质直接吸附在超干净的石墨烯表面上。吸附过程在石墨烯设备的电导率上产生了强温度和电场依赖性行为。观察到中立点周围的电导率从30 K时的$ e^2/h $降低到$ \ sim0.01〜e^2/h $ 20 mk。从$ \ \ \ \ \ \ \ \ \ t $内的量子霍尔导体的直接过渡，并伴随着断裂的对称性诱导的$ν= 0，\ pm1 $ plateaux证实了间隔散射器的存在。
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 $e^2/h$ at 30 K to $\sim0.01~e^2/h$ at 20 mK. A direct transition from insulator to quantum Hall conductor within $\approx0.4~T$ accompanied by broken-symmetry-induced $ν=0,\pm1$ plateaux confirms the presence of intervalley scatterers.
