Spin-orbit coupling and interactions in quantum Hall states of graphene/ WSe2 heterobilayers
Spin-orbit coupling and interactions in quantum Hall states of graphene/ WSe2 heterobilayers
复制标题
DOI：
10.1103/physrevb.104.l201301
复制
发表时间：
2021-11
影响因子：
3.7
通讯作者：
Dongying Wang;M. Karaki;Nicholas Mazzucca;Haidong Tian;G. Cao;ChunNing Lau;Yuan-Ming Lu;M. Bockrath
中科院分区：
文献类型：
--
作者：
Dongying Wang;M. Karaki;Nicholas Mazzucca;Haidong Tian;G. Cao;ChunNing Lau;Yuan-Ming Lu;M. Bockrath
我们使用磁输运测量来探测石墨烯/异质双层中的量子霍尔基态。与原始石墨烯相比，在远离填充因子的半填充四重态处的朗道能级（LL）间隙对磁场的依赖性明显减弱，而奇数填充的间隙对磁场的依赖性更强.我们解释这种行为使用一个模型，将伊辛和Rashba自旋轨道耦合（SOC）沿着与库仑相互作用的自洽Hartree-Fock框架内。模型拟合产生伊辛SOC的范围内，Rashba，和面内介电常数，在协议先前发现的值。在第零个LL四重态中，与原始石墨烯相比，作为磁场函数的间隙在5 T附近表现出平台。这种行为与SOC导致从倾斜反铁磁状态到铁磁状态的相变发生在低得多的场的模型一致。我们的研究展示了SOC和电子相互作用的相互作用如何影响石墨烯的电子结构。
We use magnetotransport measurements to probe quantum Hall ground states in graphene/heterobilayers. Compared to pristine graphene, inter-Landau level (LL) gaps at half-filled quartets away from filling factorshow significantly weaker dependence on the magnetic field, while oddfillings show a stronger dependence. We interpret this behavior using a model incorporating Ising and Rashba spin-orbit coupling (SOC) along with Coulomb interactions within the self-consistent Hartree-Fock framework. A model fit yields Ising SOC in range, Rashba, and the in-plane dielectric constant, in agreement to previously found values. In the zeroth LL quartet, thegap as a function of magnetic field exhibits a plateau near 5 T, compared tofor pristine graphene. This behavior is in agreement with a model in which the SOC causes a phase transition from a canted antiferromagnetic state to a ferromagnetic state to occur at a much lower field. Our studies demonstrate how the interplay of SOC and electronic interactions affect graphene's electronic structure.