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Many-body dispersions in interacting ballistic quantum wires

机译:相互作用弹道量子线中的多体分散

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We have measured the collective excitation spectrum of interacting electrons in one-dimension. The experiment consists of controlling the energy and momentum of electrons tunneling between two clean and closely situated, parallel quantum wires in a GaAs/AlGaAs heterostructure while measuring the resulting conductance. We measure excitation spectra that clearly deviate from the non-interacting spectrum, attesting to the importance of Coulomb interactions. Notable is an observed 30% enhancement of the velocity of the main excitation branch relative to non-interacting electrons with the same density. In short wires, finite size effects resulting from broken translational invariance are observed. Spin-charge separation is manifested through moire patterns reflecting different spin and charge excitation velocities. (C) 2004 Elsevier Ltd. All rights reserved.
机译:我们已经测量了一维相互作用电子的集体激发光谱。该实验包括控制GaAs / AlGaAs异质结构中两条干净且位置紧密的平行量子线之间电子隧穿的能量和动量,同时测量所产生的电导。我们测量的激发光谱明显偏离了非相互作用光谱,证明了库仑相互作用的重要性。值得注意的是,相对于具有相同密度的非相互作用电子,主激励分支的速度提高了30%。在短导线中,观察到由断裂的平移不变性引起的有限尺寸效应。自旋电荷的分离通过反映不同自旋和电荷激发速度的莫尔条纹来体现。 (C)2004 Elsevier Ltd.保留所有权利。

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