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<p>While electron–electron (e–e) interactions are known to influence resistivity in non-Galilean invariant two-dimensional (2D) systems, their effect on magnetotransport is not fully understood. Conventional models for simple bands often predict a vanishing magnetoresistivity from e–e interactions alone. In this work, we investigate magnetotransport in a gapless 6.3 nm HgTe quantum well, a hybrid 2D band system that hosts coexisting holes with both linear (Dirac-like) and parabolic energy bands. Focusing on the high-temperature regime where particle–particle collisions dominate scattering, we observe significant corrections to both the magnetoresistivity and the Hall effect. The high-temperature transport coefficients are in good agreement with the theoretical model describing transport in massive–massless fermion mixtures governed by a frictional mechanism and intervalley scattering. Our findings provide strong experimental validation for this theoretical framework, demonstrating that collisions between particles with different dispersions are a key mechanism governing magnetotransport in hybrid-band semimetals.</p>

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Interaction-induced magnetotransport in a 2D Dirac–Heavy hole hybrid band system

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年12月13日

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  • G. M. Gusev,
  • A. D. Levin,
  • V. A. Chitta,
  • Z. D. Kvon,
  • N. N. Mikhailov

摘要

While electron–electron (e–e) interactions are known to influence resistivity in non-Galilean invariant two-dimensional (2D) systems, their effect on magnetotransport is not fully understood. Conventional models for simple bands often predict a vanishing magnetoresistivity from e–e interactions alone. In this work, we investigate magnetotransport in a gapless 6.3 nm HgTe quantum well, a hybrid 2D band system that hosts coexisting holes with both linear (Dirac-like) and parabolic energy bands. Focusing on the high-temperature regime where particle–particle collisions dominate scattering, we observe significant corrections to both the magnetoresistivity and the Hall effect. The high-temperature transport coefficients are in good agreement with the theoretical model describing transport in massive–massless fermion mixtures governed by a frictional mechanism and intervalley scattering. Our findings provide strong experimental validation for this theoretical framework, demonstrating that collisions between particles with different dispersions are a key mechanism governing magnetotransport in hybrid-band semimetals.