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arXiv 1702.08595cond-mat.str-el
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双层分数量子霍尔系统中的隧道输运和层间激子

Tunnel transport and interlayer excitons in bilayer fractional quantum Hall systems

Yuhe Zhang, J. K. Jain, J. P. Eisenstein

摘要:

在双层系统中的复合费米子费米海的每一层组成,隧道电流是指数抑制在零偏置,其次是一个强大的峰值在有限的偏置电压$V_{\rm max}$。这种行为,这是从观察到的电子费米海的性质不同,提供了基本的洞察力的CF费米海的强相关的非费米液体的性质,特别是,提供了一个窗口到短距离高能物理的这种状态。我们确定了负责的峰值电流的激子,并提供了一个定量帐户的值$V_{\rm max}$。激子的吸引力被证明是定量显着的,它的变化占的增加$V_{\rm max}$与应用程序的面内磁场。我们还估计了临界塞曼能量,其中发生从完全自旋极化的复合费米海到部分自旋极化的费米海的跃迁,仔细地结合了由于有限宽度和朗道能级混合引起的校正,并且发现它与塞曼能量令人满意地一致,其中已经观察到起始偏置电压的定性变化[Eisenstein等人,Rev.B94,125409(2016)]。对于分数量子霍尔态,我们预言了当系统经历从完全自旋极化态到自旋单态或部分自旋极化态的跃迁时,$V_{\rm max}$中的一个显著的不连续跳跃.

英文摘要:

In a bilayer system consisting of a composite-fermion Fermi sea in each layer, the tunnel current is exponentially suppressed at zero bias, followed by a strong peak at a finite bias voltage $V_{\rm max}$. This behavior, which is qualitatively different from that observed for the electron Fermi sea, provides fundamental insight into the strongly correlated non-Fermi liquid nature of the CF Fermi sea and, in particular, offers a window into the short-distance high-energy physics of this state. We identify the exciton responsible for the peak current and provide a quantitative account of the value of $V_{\rm max}$. The excitonic attraction is shown to be quantitatively significant, and its variation accounts for the increase of $V_{\rm max}$ with the application of an in-plane magnetic field. We also estimate the critical Zeeman energy where transition occurs from a fully spin polarized composite fermion Fermi sea to a partially spin polarized one, carefully incorporating corrections due to finite width and Landau level mixing, and find it to be in satisfactory agreement with the Zeeman energy where a qualitative change has been observed for the onset bias voltage [Eisenstein et al., Phys. Rev. B 94, 125409 (2016)]. For fractional quantum Hall states, we predict a substantial discontinuous jump in $V_{\rm max}$ when the system undergoes a transition from a fully spin polarized state to a spin singlet or a partially spin polarized state.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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