Highly Anisotropic Even-Denominator Fractional Quantum Hall State in an Orbitally Coupled Half-Filled Landau Level
Highly Anisotropic Even-Denominator Fractional Quantum Hall State in an Orbitally Coupled Half-Filled Landau Level
复制标题
轨道耦合半填充朗道能级中的高度各向异性偶分母分数量子霍尔态
DOI：
10.1103/physrevlett.131.056302
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发表时间：
2023
影响因子：
8.6
通讯作者：
Shayegan, M.
中科院分区：
文献类型：
--
作者：
Wang, Chengyu;Gupta, A.;Chung, Y. J.;Pfeiffer, L. N.;West, K. W.;Baldwin, K. W.;Winkler, R.;Shayegan, M.
半满朗道能级中的偶分母分数量子霍尔态（FractionalQuantumHall State，简称FHS）通常被认为是非阿贝尔准粒子的宿主，在拓扑量子计算中具有潜在的应用价值。特别令人感兴趣的是竞争和相互作用之间的偶数分母的量子阱和其他基态，如各向异性相和复合费米子费米海。本文报道了在朗道能级填充因子下，观察到具有高度各向异性面内输运系数的偶分母分数量子霍尔态。我们观察到这种状态时，一个超高质量的GaAs二维孔系统的大面内磁场施加。通过增加面内场，我们观察到从各向同性复合费米海到各向异性偶分母费米海的急剧转变。我们的数据和计算表明，二维空穴的一个独特的特性，即重空穴态和轻空穴态之间的耦合，在一个朗道能级的波函数中结合了不同的轨道分量，导致了高度各向异性的偶分母分数量子霍尔态的出现.我们的研究结果表明，GaAs二维空穴系统是一个独特的平台，探索异国情调，多体基态。
The even-denominator fractional quantum Hall states (FQHSs) in half-filled Landau levels are generally believed to host non-Abelian quasiparticles and be of potential use in topological quantum computing. Of particular interest is the competition and interplay between the even-denominator FQHSs and other ground states, such as anisotropic phases and composite fermion Fermi seas. Here, we report the observation of an even-denominator fractional quantum Hall state with highly anisotropic in-plane transport coefficients at Landau level filling factor. We observe this state in an ultra-high-quality GaAs two-dimensional hole system when a large in-plane magnetic field is applied. By increasing the in-plane field, we observe a sharp transition from an isotropic composite fermion Fermi sea to an anisotropic even-denominator FQHS. Our data and calculations suggest that a unique feature of two-dimensional holes, namely the coupling between heavy-hole and light-hole states, combines different orbital components in the wave function of one Landau level, and leads to the emergence of a highly anisotropic even-denominator fractional quantum Hall state. Our results demonstrate that the GaAs two-dimensional hole system is a unique platform for the exploration of exotic, many-body ground states.