Orbital mixing in few-layer graphene and non-Abelian Berry phase
Orbital mixing in few-layer graphene and non-Abelian Berry phase
复制标题
少层石墨烯和非阿贝尔贝里相的轨道混合
DOI：
10.1103/physrevb.104.155417
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发表时间：
2021
影响因子：
3.7
通讯作者：
Shizuya K.
中科院分区：
文献类型：
--
作者：
Abe Katsuya T.;Tashiro Hiroyuki;Shizuya K.
在磁场中，少层石墨烯在最低的朗道能级处支持零模能级的多重态，其在轨道以及自旋和谷中几乎简并。这些伪零模（PZM）能级通常对相互作用和外部扰动敏感，并且当外场扫过一定范围时，它们之间或与其他更高的朗道能级具有交叉。一个密切的研究是如何这样的PZM水平演变时，他们逐渐从空到充满水平下的多体相互作用。指出能级谱一般通过轨道能级混合避免交叉，而轨道混合由近似简并和相互作用产生的非阿贝尔Berry相控制。一个外观也考虑到多体基态的演化/交叉与双层石墨烯中的外部偏压增加。
In a magnetic field, few-layer graphene supports, at the lowest Landau level, a multiplet of zero-mode levels nearly degenerate in orbitals as well as in spins and valleys. Those pseudo-zero-mode (PZM) levels are generally sensitive to interactions and external perturbations and have a crossing among themselves or with other higher Landau levels when an external field is swept over a certain range. A close study is made of how such PZM levels evolve when they are gradually brought from empty to filled levels under many-body interactions. It is pointed out that the level spectra generally avoid a crossing via orbital level mixing and that orbital mixing is governed by a non-Abelian Berry phase that derives from an approximate degeneracy and interactions. A look is also taken into evolution/crossing of many-body ground states with increasing external bias in bilayer graphene.
影响因子：
56.9
作者：
Ohta, Taisuke;Bostwick, Aaron;Rotenberg, Eli
通讯作者：
Rotenberg, Eli
影响因子：
19.6
作者：
Novoselov, KS;McCann, E;Geim, AK
通讯作者：
Geim, AK