Suppression of Anderson localization in a graphene sheet applied by a random voltage pattern
- 作者：Hai-tao Jiang ; jiang-haitao@tongji.edu.cn ; Jie-fei Zhang ; Zi-li Wang ; Yun-hui Li ; Hong Chen
- 关键词：Graphene ; Anderson localization ; Phase compensation
- 刊名：Physics Letters A
- 出版年：2012
- 期刊代码：57_03759601
- 类别：ph
- 出版时间：26 March, 2012
- 卷：376
- 期：17
- 页码：1509-1514
- 文件大小：796 K
摘要
We theoretically study the transport of electronic waves through a graphene sheet applied by a random voltage pattern in which the magnitudes and/or the widths of the voltages are random. When the magnitudes of the voltages exceed the electronic energy, the applied region can be considered as left-handed (LH) layers. Compared to the disordered structures with right-handed (RH) layers only, the spectra of the (average) density of states and the localization lengths in mixed random structures with RH and LH layers all show the suppression of Anderson localization, owing to the phase compensation effect of LH layers that reduces the long-range interference in the random system.