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arXiv 2602.12440cond-mat.mes-hall
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强Rashba分裂空穴子带的磁输运光谱揭示了多体相互作用

Magnetotransport Spectroscopy of Strongly Rashba-Split Hole Subbands Reveals Many-Body Interactions

Institute for Quantum Computing, University of Waterloo(滑铁卢大学量子计算研究所);Department of Electrical and Computer Engineering, University of Waterloo(滑铁卢大学电气与计算机工程系);Department of Chemistry, University of Waterloo(滑铁卢大学化学系);Department of Physics and Astronomy, University of Waterloo(滑铁卢大学物理与天文系);Emerging Technologies Division, National Research Council of Canada(加拿大国家研究委员会新兴技术部);Waterloo Institute for Nanotechnology, University of Waterloo(滑铁卢大学滑铁卢纳米技术研究所)
F. Sfigakis, N. A. Cockton, M. Korkusinski, S. R. Harrigan, G. Nichols, Z. D. Merino, T. Zou, A. C. Coschizza, T. Joshi, A. Shetty, M. C. Tam, Z. R. Wasilewski,… 展开作者

F. Sfigakis, N. A. Cockton, M. Korkusinski, S. R. Harrigan, G. Nichols, Z. D. Merino, T. Zou, A. C. Coschizza, T. Joshi, A. Shetty, M. C. Tam, Z. R. Wasilewski, S. A. Studenikin, D. G. Austing, J. B. Kycia, J. Baugh

AI总结:

通过磁输运光谱研究强Rashba分裂空穴子带,揭示多体相互作用对有效质量增强的影响,解决GaAs中自旋轨道极化重空穴系统有效质量测量的三重矛盾。

摘要:

我们报告了在低散射二维空穴气体(2DHG)中进行的磁输运实验结果,这些气体处于强相关液体态,存在于无掺杂的(100)GaAs/AlGaAs单异质结中。在较宽的2DHG密度范围内(从0.7×10¹⁵/m²到2×10¹⁵/m²),对低磁场(B<1T)的Shubnikov-德哈斯振荡进行傅里叶分析,揭示了两个具有不同有效质量的自旋轨道分裂重空穴(HH)子带,它们对输运有贡献。令人惊讶的是,较轻质量的HH子带表现出抛物线形的色散关系,其费米波矢位于重空穴与轻空穴子带的反交叉点之下,而较重的HH子带在整个范围内非抛物线形。与基于Luttinger模型的数值计算的定量比较表明,两种有效质量都由一个共同因子(约为2.3)增强,我们将其归因于多体相互作用。这个共同的缩放因子对2DHG密度的依赖性非常弱,可能由于带的混合。我们测得的空穴质量与已发表的回旋共振和磁输运值进行了比较。我们提出了一种框架,以协调GaAs中部分自旋轨道极化的重空穴系统中密度依赖的有效质量在Luttinger理论、磁输运和回旋共振测量之间的长期三重矛盾。

英文摘要:

We report the results of magnetotransport experiments carried out on low-disorder 2D hole gases (2DHG) in the strongly correlated liquid regime, hosted in dopant-free (100) GaAs/AlGaAs single heterojunctions. Over a wide range of 2DHG densities (from 0.7 $\times$ 10$^{15}$/m$^2$ to $2 \times 10^{15}$/m$^2$), Fourier analysis of low-field (B < 1 T) Shubnikov-de Haas oscillations reveals two spin-orbit-split heavy-hole (HH) subbands with distinct effective masses contributing to transport. Surprisingly, the lighter-mass HH subband exhibits a parabolic dispersion with Fermi wavevector below the anticrossing between the heavy-hole and light-hole subbands, while the heavier HH subband is non-parabolic throughout. Quantitative comparison with numerical calculations based on the Luttinger model reveals that both effective masses are enhanced by a common factor ($\approx$ 2.3), which we attribute to many-body interactions. This common scaling factor has a very weak dependence on the 2DHG density, likely due to band hybridization. Our measured hole masses are compared with published cyclotron resonance and magnetotransport values. We propose a cohesive framework reconciling the long-standing three-way discrepancy between Luttinger theory, magnetotransport, and cyclotron resonance measurements of density-dependent effective masses in partially spin-orbit-polarized heavy-hole systems in GaAs.

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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