Competing spin-valley entangled and broken symmetry states in the N=1 Landau level of graphene
Competing spin-valley entangled and broken symmetry states in the
N=1
Landau level of graphene
复制标题
石墨烯 N=1 朗道能级中的竞争自旋谷纠缠态和破缺对称态
DOI：
10.1103/physrevb.107.045132
复制
发表时间：
2022
影响因子：
3.7
通讯作者：
Inti Sodemann Villadiego
中科院分区：
文献类型：
--
作者：
N. Stefanidis;Inti Sodemann Villadiego
我们研究了多体基态的部分整数填充的$N=1$朗道水平在石墨烯，通过构建一个模型，占晶格尺度修正的库仑相互作用。有趣的是，在对比$N=0$朗道水平，这个模型不仅包含纯δ函数的相互作用，但也有一些其衍生物。因此，我们发现$N=0$朗道水平的几个重要差异。例如，在四分之一填充时，当仅填充单个组分时，存在量子霍尔铁磁体的简并提升，并且具有纠缠自旋和谷自由度的基态可以变得有利。此外，在$N=1$朗道能级的半填充处，我们发现了一个新的相位，这是在$N=0$朗道能级中所没有的，它结合了Kekul {e}态和反铁磁的特征。我们还发现，根据在最近的实验中提取的参数，在半填充的$N=1$朗道水平的石墨烯预计将在AF和CDW状态之间的微妙的竞争，但我们也讨论了为什么这些最近的实验模型可能会丢失一些重要的条款。
We study many-body ground states for the partial integer fillings of the $N=1$ Landau level in graphene, by constructing a model that accounts for the lattice scale corrections to the Coulomb interactions. Interestingly, in contrast to the $N=0$ Landau level, this model contains not only pure delta function interactions but also some of its derivatives. Due to this we find several important differences with respect to the $N=0$ Landau level. For example at quarter filling when only a single component is filled, there is a degeneracy lifting of the quantum hall ferromagnets and ground states with entangled spin and valley degrees of freedom can become favourable. Moreover at half-filling of the $N=1$ Landau level, we have found a new phase that is absent in the $N=0$ Landau level, that combines characteristics of the Kekul\'{e} state and an antiferromagnet. We also find that according to the parameters extracted in a recent experiment, at half-filling of the $N=1$ Landau level graphene is expected to be in a delicate competition between an AF and a CDW state, but we also discuss why the models for these recent experiments might be missing some important terms.
影响因子：
56.9
作者：
Liu, Xiaomeng;Farahi, Gelareh;Yazdani, Ali
通讯作者：
Yazdani, Ali