论文标题
在广义Wigner晶体中的映射电荷激发
Mapping Charge Excitations in Generalized Wigner Crystals
论文作者
论文摘要
基于过渡金属二北元化的Moire超级晶格表现出非常强的电子电子相关性，因此产生了强烈相关的量子现象，例如概括性的Wigner晶体状态。理论研究预测，由于通用的Wigner晶体状态下的远距离库仑相互作用，上层和下哈伯德带之间的相关差距之间的异常准颗粒激发可能会出现。在这里，我们描述了一种具有纳米空间分辨率和单电子电荷分辨率的新型扫描单电子充电（SSEC）光谱技术，使我们能够直接对电子和孔波函数进行成像，并确定扭曲的WS2 Moire y Moirire ysostrentures中广义Wigner晶体状态的热力学间隙。通过将扫描隧道显微镜（STM）与单层石墨烯传感层相结合，从而实现了高分辨率SSEC光谱，从而使人可以在广义的Wigner晶体中产生单个电子和孔准粒子。我们表明，电子和孔准粒子具有互补的波函数分布，并且对于1/3和2/3概括的Wigner晶体状态存在50mev阶的热力学间隙。
Transition metal dichalcogenide-based moire superlattices exhibit very strong electron-electron correlations, thus giving rise to strongly correlated quantum phenomena such as generalized Wigner crystal states. Theoretical studies predict that unusual quasiparticle excitations across the correlated gap between upper and lower Hubbard bands can arise due to long-range Coulomb interactions in generalized Wigner crystal states. Here we describe a new scanning single-electron charging (SSEC) spectroscopy technique with nanometer spatial resolution and single-electron charge resolution that enables us to directly image electron and hole wavefunctions and to determine the thermodynamic gap of generalized Wigner crystal states in twisted WS2 moire heterostructures. High-resolution SSEC spectroscopy was achieved by combining scanning tunneling microscopy (STM) with a monolayer graphene sensing layer, thus enabling the generation of individual electron and hole quasiparticles in generalized Wigner crystals. We show that electron and hole quasiparticles have complementary wavefunction distributions and that thermodynamic gaps of order 50meV exist for the 1/3 and 2/3 generalized Wigner crystal states.
