Probing Two-Electron Multiplets in Bilayer Graphene Quantum Dots
Probing Two-Electron Multiplets in Bilayer Graphene Quantum Dots
复制标题
探测双层石墨烯量子点中的双电子多重态
DOI：
10.1103/physrevlett.127.256802
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发表时间：
2021
影响因子：
8.6
通讯作者：
Glazman, L. I.
中科院分区：
文献类型：
--
作者：
Möller, S.;Banszerus, L.;Knothe, A.;Steiner, C.;Icking, E.;Trellenkamp, S.;Lentz, F.;Watanabe, K.;Taniguchi, T.;Glazman, L. I.
我们报告了在不同磁场下门定义的双层石墨烯（BLG）量子点中双电子谱的有限偏置光谱测量。 BLG 中的自旋和谷自由度产生了六个轨道对称态和十个轨道反对称态的多重态。我们发现轨道对称态能量较低，并且与轨道反对称态分开。由于晶格尺度相互作用，对称多重态表现出其六种状态的额外能量分裂。实验观察结果得到了理论计算的支持，可以确定 BLG 中的层间散射和“电流-电流”相互作用常数具有相同的量级。
We report on finite bias spectroscopy measurements of the two-electron spectrum in a gate defined bilayer graphene (BLG) quantum dot for varying magnetic fields. The spin and valley degree of freedom in BLG give rise to multiplets of six orbital symmetric and ten orbital antisymmetric states. We find that orbital symmetric states are lower in energy and separated byfrom orbital antisymmetric states. The symmetric multiplet exhibits an additional energy splitting of its six states ofdue to lattice scale interactions. The experimental observations are supported by theoretical calculations, which allow to determine that intervalley scattering and “current-current” interaction constants are of the same magnitude in BLG.