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arXiv 1003.4962cond-mat.mes-hall
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双量子霍尔体系中的能量弛豫

Energy Relaxation in the Integer Quantum Hall Regime

H. le Sueur, C. Altimiras, U. Gennser, A. Cavanna, D. Mailly, F. Pierre

摘要:

我们研究了填充因子为$ν_L=2$的整数量子霍尔体系中电子量子信道的能量交换。两个边缘通道中的一个被驱离平衡,并且在几个传播长度$0.8~μ$ m $\leq L\leq30~μ$ m之后,在外部通道中测量所得的电子能量分布。虽然没有明显的能量转移到热化状态,我们发现有效的能量重新分配之间的两个通道没有粒子交换。在长距离$L\geq10~μ$ m处,测得的能量分布是热费米函数,其温度低于两个相互作用通道的预期温度,这表明额外自由度的贡献。所观察到的短能量弛豫长度的挑战通常描述的量子霍尔激发准粒子定位在一个边缘通道。

英文摘要:

We investigate the energy exchanges along an electronic quantum channel realized in the integer quantum Hall regime at filling factor $ν_L=2$. One of the two edge channels is driven out-of-equilibrium and the resulting electronic energy distribution is measured in the outer channel, after several propagation lengths $0.8~μ$m$\leq L\leq30~μ$m. Whereas there are no discernable energy transfers toward thermalized states, we find efficient energy redistribution between the two channels without particle exchanges. At long distances $L\geq10~μ$m, the measured energy distribution is a hot Fermi function whose temperature is lower than expected for two interacting channels, which suggests the contribution of extra degrees of freedom. The observed short energy relaxation length challenges the usual description of quantum Hall excitations as quasiparticles localized in one edge channel.

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