Magnetotransport Spectroscopy of Strongly Rashba-Split Hole Subbands Reveals Many-Body Interactions
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| Main Authors: | , , , , , , , , , , , , , , , |
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2026
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| author | Sfigakis, F. Cockton, N. A. Korkusinski, M. Harrigan, S. R. Nichols, G. Merino, Z. D. Zou, T. Coschizza, A. C. Joshi, T. Shetty, A. Tam, M. C. Wasilewski, Z. R. Studenikin, S. A. Austing, D. G. Kycia, J. B. Baugh, J. |
| author_facet | Sfigakis, F. Cockton, N. A. Korkusinski, M. Harrigan, S. R. Nichols, G. Merino, Z. D. Zou, T. Coschizza, A. C. Joshi, T. Shetty, A. Tam, M. C. Wasilewski, Z. R. Studenikin, S. A. Austing, D. G. Kycia, J. B. Baugh, J. |
| contents | 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. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2602_12440 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Magnetotransport Spectroscopy of Strongly Rashba-Split Hole Subbands Reveals Many-Body Interactions Sfigakis, F. Cockton, N. A. Korkusinski, M. Harrigan, S. R. Nichols, G. Merino, Z. D. Zou, T. Coschizza, A. C. Joshi, T. Shetty, A. Tam, M. C. Wasilewski, Z. R. Studenikin, S. A. Austing, D. G. Kycia, J. B. Baugh, J. Mesoscale and Nanoscale Physics 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. |
| title | Magnetotransport Spectroscopy of Strongly Rashba-Split Hole Subbands Reveals Many-Body Interactions |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2602.12440 |