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arXiv 1306.6875cond-mat.mes-hallcond-mat.str-el
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器件几何结构对ν=5/2量子霍尔液体隧穿的影响

Influence of device geometry on tunneling in ν=5/2 quantum Hall liquid

Guang Yang, D. E. Feldman

摘要:

最近的两个实验[一]。P. Radu等人,Science 320,899(2008)和X. Lin等人,Phys.Rev.B85,165321(2012)]测量了准粒子隧穿通过ν= 5/2量子霍尔液体中的量子点接触的温度和电压依赖性。这些结果导致了关于量子霍尔态性质的相互矛盾的结论。在本文中,我们表明,可以通过识别不同的几何形状的设备在实验中解决的冲突。我们认为,在这些几何形状中的一些有显着的未屏蔽的静电相互作用的量子霍尔边缘的点接触的相对两侧的部分之间。库仑相互作用影响隧穿电流。我们比较了Pfalan态、SU(2)_2,331态和K=8态及其粒子-空穴共轭的实验结果与理论预言。在考虑库仑修正后,所有几何结构的测量结果与自旋极化和自旋非极化Halperin 331态一致。

英文摘要:

Two recent experiments [I. P. Radu et al., Science 320, 899 (2008) and X. Lin et al., Phys. Rev. B 85, 165321 (2012)] measured the temperature and voltage dependence of the quasiparticle tunneling through a quantum point contact in the ν= 5/2 quantum Hall liquid. The results led to conflicting conclusions about the nature of the quantum Hall state. In this paper, we show that the conflict can be resolved by recognizing different geometries of the devices in the experiments. We argue that in some of those geometries there is significant unscreened electrostatic interaction between the segments of the quantum Hall edge on the opposite sides of the point contact. Coulomb interaction affects the tunneling current. We compare experimental results with theoretical predictions for the Pfaffian, SU(2)_2, 331 and K=8 states and their particle-hole conjugates. After Coulomb corrections are taken into account, measurements in all geometries agree with the spin-polarized and spin-unpolarized Halperin 331 states.

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