半经典物理学
物理
阿贝尔群
准周期函数
凝聚态物理
格子(音乐)
规范理论
数学物理
可重入
量子力学
量子电动力学
数学
纯数学
声学
量子
作者
En Guo Guan,Gang Wang,Xi‐Wen Guan,Xiaoming Cai
出处
期刊:Physical review
日期:2023-09-06
卷期号:108 (3)
标识
DOI:10.1103/physreva.108.033305
摘要
We study localization properties and mobility edges of a generalized spinful Aubry-Andr\'e-Harper (AAH) model, which is the dimensional reduction of the two-dimensional Hofstadter model with a non-Abelian SU(2) gauge potential. Depending on whether the quasiperiod is comparable with the lattice size, the model has different localization properties. In the noncomparable case, the generalized AAH model still retains duality properties. Tuning the non-Abelian gauge can make the system undergo an unconventional reentrant localization phase transition as the strength of quasiperiodic potential increases. Furthermore, mobility edges exist in the mixed phase where the localized states sit at the center of spectra. Nevertheless, the non-Abelian gauge potential results in more mobility edges than that the Abelian gauge potential does, when the model is in the semiclassical limit where the quasiperiod is comparable with the lattice size. Moreover, exact expressions of the mobility edges and localization phase diagrams are analytically obtained by a semiclassical method.
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