石墨烯中Dirac费米子量子输运特性研究

功能材料, 2013, 44(2): 281-284.

石墨烯中Dirac费米子量子输运特性研究

杨军 ^1, , 蒋开明 ^2, , 武文远 ^3, , 陈磊 ^4, , 任星海 ^5,

1.解放军理工大学理学院,江苏南京211101

2.上海海事大学物理系,上海201306

3.解放军理工大学理学院,江苏南京211101

4.解放军理工大学理学院,江苏南京211101

5.解放军理工大学理学院,江苏南京211101

基金项目: 解放军理工大学预研基金重点资助项目(20110502) 上海市教委创新资助项目(11YZ138) 上海市自然科学基金资助项目(09ZR1421400)

关键词：石墨烯 , Dirac费米子 , 透射系数 , 入射能量 , 入射角度

Study on quantum transport properties of graphene Dirac fermions

利用紧束缚模型的方法研究了石墨烯中Dirac费米子的势垒相关输运特性,分析了石墨烯中Dirac费米子的势垒透射率与其入射角度、入射能量、势垒高度和势垒厚度等对应关系.通过理论分析和数值计算表明,石墨烯中Dirac费米子的隧穿系数随矩形势垒的高度和厚度的变化都呈现出明显的振荡效应,隧穿系数与入射角度依赖关系证实了Klein效应.在一定参数下,Dirac费米子的势垒透射率随Dirac费米子入射能量的变化经历从“0”～“1”的突变,显示良好的“电导开关效应”,该效应在微电子器件中将有很好的应用前景.

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石墨烯中Dirac费米子量子输运特性研究

Study on quantum transport properties of graphene Dirac fermions

参考文献