arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2006.16016cond-mat.mes-hall
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量子霍尔效应中边缘模的能量弛豫

Energy relaxation in edge modes in the quantum Hall effect

Amir Rosenblatt, Sofia Konyzheva, Fabien Lafont, Noam Schiller, Jinhong Park, Kyrylo Snizhko, Moty Heiblum, Yuval Oreg, Vladimir Umansky

摘要:

量子系统中能量流的研究补充了普通电导测量所提供的信息。在一维(1D)弹道模式的热流量子极限被预测,并实验证明,玻色子,费米子,和分数带电的任意子有一个普遍的价值。这个值的一小部分预计在非阿贝尔状态。然而,关于能量弛豫沿传播长度在1D模式仍然存在悬而未决的问题。在这里,我们介绍了一种新的实验装置,测量的量子霍尔效应(QHE)的手征一维模式的能量弛豫。边缘模式,从一个加热的水库,被分割的量子点接触(QPC)位于其路径。由此产生的噪声允许在QPC的位置的“有效温度”的确定。我们发现能量弛豫在所有测试的QHE状态,整数或分数。然而,弛豫被发现是温和的类粒子状态,和突出的空穴共轭状态。

英文摘要:

Studies of energy flow in quantum systems complement the information provided by common conductance measurements. The quantum limit of heat flow in one dimensional (1D) ballistic modes was predicted, and experimentally demonstrated, to have a universal value for bosons, fermions, and fractionally charged anyons. A fraction of this value is expected in non-abelian states. Nevertheless, open questions about energy relaxation along the propagation length in 1D modes remain. Here, we introduce a novel experimental setup that measures the energy relaxation in chiral 1D modes of the quantum Hall effect (QHE). Edge modes, emanating from a heated reservoir, are partitioned by a quantum point contact (QPC) located at their path. The resulting noise allows a determination of the 'effective temperature' at the location of the QPC. We found energy relaxation in all the tested QHE states, being integers or fractional. However, the relaxation was found to be mild in particle-like states, and prominent in hole-conjugate states.

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