[1]罗运文,李秀燕.磁场引发石墨烯从金属态到绝缘态的相变[J].深圳大学学报理工版,2016,33(No.2(111-220)):143-146.[doi:10.3724/SP.J.1249.2016.02143]
 Luo Yunwenand Li Xiuyan.Magnetic field induced metal-insulator phasetransition in graphene[J].Journal of Shenzhen University Science and Engineering,2016,33(No.2(111-220)):143-146.[doi:10.3724/SP.J.1249.2016.02143]
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磁场引发石墨烯从金属态到绝缘态的相变()
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《深圳大学学报理工版》[ISSN:1000-2618/CN:44-1401/N]

卷:
第33卷
期数:
2016年No.2(111-220)
页码:
143-146
栏目:
物理
出版日期:
2016-03-20

文章信息/Info

Title:
Magnetic field induced metal-insulator phasetransition in graphene
文章编号:
201602006
作者:
罗运文李秀燕
闽南师范大学物理与电子信息工程系,福建漳州 363000
Author(s):
Luo Yunwenand Li Xiuyan
Department of Physics and Electronic Information Engineering, Minnan Normal University, Zhangzhou 363000, Fujian Province, P.R.China
关键词:
凝聚态物理学石墨烯哈伯德模型量子霍尔效应微扰法金属-绝缘态相变
Keywords:
condensated matter physics graphene Hubbard model quantum Hall effect perturbation method metal-insulator transition
分类号:
O 469
DOI:
10.3724/SP.J.1249.2016.02143
文献标志码:
A
摘要:
基于哈伯德模型,用微扰法计算磁场中石墨烯从金属态到绝缘态相变的临界值.研究发现,加入强磁场后,由于发生了量子霍尔效应,石墨烯的电子态和空穴态在零能级发生简并,因此零能级只能容纳1个电子,另一电子只能占据更高的朗道能级,这相当于增加了电子之间的相互作用能.磁场增大了电子之间的相互作用能,引起石墨烯从金属态向绝缘态的相变.
Abstract:
We calculate the critical value of condensed composite particles in graphene for metal-insulator phase transition in a magnetic field by using perturbation method based on the Hubbard model. We find that since the quantum Hall effect (QHE) occurs in high magnetic fields, the electron state and the hole state of graphene degenerate at zero energy level. Thus the lowest Landau level could only accommodate one electron and the other electron has to go to a higher Landau level. This is equivalent to increasing the interaction energy between electrons. The interaction energy increases due to the magnetic field, which induces the metal-insulator phase transition in graphene.

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备注/Memo

备注/Memo:
Received:2015-12-11;Accepted:2016-01-31
Foundation:Natural Science Foundation of Fujian Province (2012D143)
Corresponding author:Associate professor Luo Yunwen.E-mail: yunwenluo@163.com
Citation:Luo Yunwen, Li Xiuyan. Magnetic field induced metal-insulator phase transition in graphene[J]. Journal of Shenzhen University Science and Engineering, 2016, 33(2): 143-146.(in Chinese)
基金项目:福建省自然科学基金资助项目(2012D143)
作者简介:罗运文(1974—),男,闽南师范大学副教授.研究方向:凝聚态物理.E-mail: yunwenluo@163.com
引文:罗运文,李秀燕.磁场引发石墨烯从金属态到绝缘态的相变[J]. 深圳大学学报理工版,2016,33(2):143-146.
更新日期/Last Update: 2016-03-04