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arXiv 2302.07067cond-mat.mes-hall
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MoS2二维电子-电子双层膜中的量子固相和库仑阻力

Quantum solid phase and Coulomb drag in two-dimensional electron-electron bilayers of MoS2

Meizhen Huang, Zefei Wu, Ning Wang, Siu-Tat Chui

摘要:

库仑阻力实验可以提供双层系统相互作用状态的信息。在这里,我们展示了异常的库仑阻力行为,在二维电子-电子双层系统的氮化硼薄介电层的相对两侧堆叠原子薄的二硫化钼。在低温下,测得的阻力不遵循库仑阻力模型预测的行为交换动量和能量与费米液体双层系统中的粒子。相反,它显示了一个向上的越来越高的价值。我们调查量子固体/流体相和Kosterlitz-millless/Wigner二维量子熔化过渡在这个双层系统中,并描述了这种有趣的现象的基础上,从形成的相关诱导的电子固相增强稳定的潜在的氮化硼介电层的量子缺陷的热激活载流子。

英文摘要:

Coulomb drag experiments can give us information about the interaction state of double-layer systems. Here, we demonstrate anomalous Coulomb drag behaviours in a two-dimensional electron-electron bilayer system constructed by stacking atomically thin MoS2 on opposite sides of thin dielectric layers of boron nitride. In the low temperature regime, the measured drag resistance does not follow the behaviour predicted by the Coulomb drag models of exchanging momenta and energies with the particles in Fermi-liquid bilayer systems. Instead, it shows an upturn to higher and higher values. We investigate quantum solid/fluid phases and the Kosterlitz-Thouless/Wigner two-dimensional quantum melting transition in this bilayer system and describe this interesting phenomenon based on thermally activated carriers of quantum defects from the formation of the correlation-induced electron solid phases with enhanced stabilization by the potential due to the boron nitride dielectric layers.

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