Coexistence of Canted Antiferromagnetism and Bond Order in ν=0 Graphene
Coexistence of Canted Antiferromagnetism and Bond Order in ν=0 Graphene
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δ=0 石墨烯中倾斜反铁磁性与键序的共存
DOI：
10.1103/physrevlett.128.106803
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发表时间：
2022
影响因子：
8.6
通讯作者：
Murthy, Ganpathy
中科院分区：
文献类型：
--
作者：
Das, Ankur;Kaul, Ribhu K.;Murthy, Ganpathy
受量子霍尔区石墨烯的实验研究的启发，我们重温了单层石墨烯在电荷中性时的相图。由于自旋和谷的简并，相互作用在决定基态的性质方面起着至关重要的作用。我们表明，在Hartree-Fock近似下，在感兴趣的区域中，在相图中存在磁序和键序共存的区域。我们在连续介质和晶格模型中都证明了这一结果，并认为共存相自然地为石墨烯中量子霍尔效应的不一致实验观测提供了可能的解释。
Motivated by experimental studies of graphene in the quantum Hall regime, we revisit the phase diagram of a single sheet of graphene at charge neutrality. Because of spin and valley degeneracies, interactions play a crucial role in determining the nature of the ground state. We show that, generically within the Hartree-Fock approximation, in the regime of interest there is a region of coexistence between magnetic and bond orders in the phase diagram. We demonstrate this result both in continuum and lattice models, and argue that the coexistence phase naturally provides a possible explanation for unreconciled experimental observations on the quantum Hall effect in graphene.