Magnetotransport of the Monolayer Graphene Adsorbed by the Inert Gas In The Quantum Hall Regime
Magnetotransport of the Monolayer Graphene Adsorbed by the Inert Gas In The Quantum Hall Regime
复制标题
量子霍尔体系中惰性气体吸附的单层石墨烯的磁输运
DOI：
10.1088/1742-6596/969/1/012130
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发表时间：
2018
期刊：
影响因子：
--
通讯作者：
K. Matsumoto
中科院分区：
文献类型：
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作者：
A. Fukuda;D. Terasawa;A. Fujimoto ;Y. Kanai;K. Matsumoto
石墨烯的表面易于从外部接近，因此它是研究分子吸附对电输运性质的影响的合适材料。我们研究了在0 ~ 7 T的磁场作用下，吸附惰性气体的单层石墨烯在4.4K温度下的磁输运性质。我们在低温下将4 He或Ar气体引入保持在样品池内的石墨烯。测量了原始石墨烯的磁阻变化ΔR xx和霍尔电阻变化ΔR xy作为一层吸附物的栅极电压和磁场的函数。ΔR xx和ΔR xy显示了朗道-扇形图中与恒定填充因子线相关的振荡模式。这些量的量值在电荷中性点附近相对较高，并且可能是质量敏感的。这些条件可以被优化用于开发高灵敏度气体传感器。
The surface of graphene is easily accessible from outside, and thus it is a suitable material to study the effects of molecular adsorption on the electric transport properties. We investigate the magnetotransport of inert-gas-adsorbed monolayer graphene at a temperature of 4.4 K under a magnetic field ranging from 0 to 7 T. We introduce 4 He or Ar gas at low temperature to graphene kept inside a sample cell. The magnetoresistance change ΔR xx and Hall resistance change ΔR xy from the pristine graphene are measured as a function of gate voltage and magnetic field for one layer of adsorbates. ΔR xx and ΔR xy show oscillating patterns related to the constant filling factor lines in a Landau-fan diagram. Magnitudes of these quantities are relatively higher around a charge neutral point and may be mass-sensitive. These conditions could be optimized for development of a highly sensitive gas sensor.