Nonuniversal behavior of scattering between fractional quantum Hall edges
Nonuniversal behavior of scattering between fractional quantum Hall edges
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DOI：
10.1103/physrevlett.88.096404
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发表时间：
2002-03-04
影响因子：
8.6
通讯作者：
Halperin, BI
中科院分区：
文献类型：
--
作者：
Rosenow, B;Halperin, BI
在窄缩的分数量子霍尔系统中，准粒子在不同边缘状态之间的隧穿会导致阻力和散粒噪声。在弱散射条件下，抛射噪声与后向散射电流的比值可测量准粒子的分数电荷，这一结果已在若干实验中得到证实。然而，在某些情况下，显然没有观察到预测的电阻非线性。作为一种可能的解释，我们考虑了一个模型，其中载流边缘模式和附加声子边缘模式之间的耦合可能导致电流-电压特性的非普适指数。
In a fractional quantum Hall system with a narrow constriction, tunneling of quasiparticles between states at different edges can lead to resistance and to shot noise. The ratio of the shot noise to the backscattered current, in the weak scattering regime, measures the fractional charge of the quasiparticle, which has been confirmed in several experiments. However, the predicted nonlinearity of the resistance was apparently not observed in some of these cases. As a possible explanation, we consider a model where coupling between the current carrying edge mode and additional phononlike edge modes can lead to nonuniversal exponents in the current-voltage characteristic.