New common ground between quantum transport phenomena and relativistic field theory brought by graphene

石墨烯带来的量子输运现象与相对论场论的新共同点

• 批准号: 21540265
• 负责人: SHIZUYA Ken-ichi
• 金额: $ 2.58万
• 依托单位: Kyoto University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2009
• 资助国家: 日本
• 起止时间: 2009 至 2011
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-21540265/
• 关键词: 素粒子(理論); 場の理論; 量子輸送現象; ナノ材料; グラフェン; サイクロトロン共鳴; ラムシフト; 量子異常; 集団励起

Graphene attracts great attention as a condensed-matter system that supports Dirac fermions as charge carriers. We explored some characteristic properties of graphene that reflect its"relativistic"vacuum structure and gauge anomalies, and reached the following observations : In a magnetic field bilayer graphene supports a number of pseudo-zero-mode Landau levels with orbital degeneracy.(1) They, under electron-electron interactions, get mixed and give rise to a new kind of collective excitations with nonzero electric moment.(2) Their orbital degeneracy is lifted by quantum fluctuations, leading to the"Lamb shift", as in the hydrogen atom.(3) Also, quantum fluctuations are responsible for many-body corrections to cyclotron resonance in graphene.

石墨烯作为支持狄拉克费米子作为电荷载体的凝聚态物质系统而引起了极大的关注。我们探索了石墨烯的一些反映其“相对论”真空结构和规范异常的特性，并得到了以下观察结果：在磁场中双层石墨烯支持多个具有轨道简并的伪零模式朗道能级。（1）它们在电子-电子相互作用下混合并产生一种新型的非零电矩集体激发。（2） 它们的轨道简并性被量子涨落提升，导致“兰姆位移”，就像氢原子一样。(3) 此外，量子涨落还负责石墨烯中回旋共振的多体校正。

项目成果

Many-body corrections to cyclotron resonance in monolayer and bilayer graphene

• DOI: 10.1103/physrevb.81.075407
• 发表时间: 2009-11
• 期刊: Physical Review B
• 影响因子: 3.7
• 作者: K. Shizuya

Renormalization and cyclotron resonance in bilayer graphene with weak electron-hole asymmetry

弱电子空穴不对称双层石墨烯的重正化和回旋共振

• DOI: 10.1103/physrevb.84.075409
• 发表时间: 2011
• 期刊: Physical Review
• 作者: T.Myo;A.Umeya;H.Toki;K.Ikeda;K. Shizuya
• 通讯作者: K. Shizuya

Pseudo-zero-mode Landau levels and pseudospin waves in bilayer graphene

双层石墨烯中的伪零模朗道能级和赝自旋波

• 发表时间: 2009
• 期刊: Physica E42
• 作者: K.Horii;M.Takashina;T.Furumoto;Y.Sakuragi;H.Toki;K.Shizuya;Yoshio Koide;K.Shizuya
• 通讯作者: K.Shizuya

Cyclotron resonance and renormalization in graphene and its bilayer

石墨烯及其双层的回旋共振和重正化

• 发表时间: 2011
• 作者: K.Shizuya

Many-body corrections to cyclotron resonance in graphene

石墨烯回旋共振的多体校正

• DOI: 10.1088/1742-6596/334/1/012046
• 发表时间: 2012
• 期刊: Journal of Physics : Conference Series
• 作者: P.Capel;堀内渋;鈴木宜之;D.Baye;松原隆彦;K. Shizuya
• 通讯作者: K. Shizuya