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首页> 外文期刊>Physical review >Using magnetic stripes to stabilize superfluidity in electron-hole double monolayer graphene
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Using magnetic stripes to stabilize superfluidity in electron-hole double monolayer graphene

机译:使用磁条稳定电子空穴双单层石墨烯中的超流

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摘要

Experiments have confirmed that double monolayer graphene does not generate finite-temperature electron-hole superfluidity, because of very strong screening of the pairing attraction. The linear dispersing energy bands in monolayer graphene block any attempt to reduce the strength of the screening. We propose a hybrid device with two sheets of monolayer graphene in a modulated periodic perpendicular magnetic field. The field preserves the isotropic Dirac cones of the original monolayers but reduces the slope of the cones, making the monolayer Fermi velocity v_F smaller. We demonstrate that with current experimental techniques, the reduction in v_F can weaken the screening sufficiently to allow electron-hole superfluidity at measurable temperatures.
机译:实验已经证实,由于对配对引力的非常强的屏蔽,双层单层石墨烯不会产生有限温度的电子空穴超流动性。单层石墨烯中的线性分散能带会阻止任何降低筛选强度的尝试。我们提出了一种在调制周期垂直磁场中具有两张单层石墨烯的混合器件。该场保留了原始单层的各向同性狄拉克锥,但减小了锥的斜率,使得单层费米速度v_F较小。我们证明,利用当前的实验技术,v_F的降低可以充分削弱筛选,以允许在可测量的温度下电子空穴超流动。

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