We investigate magnetoresistivity and the Hall effect in a 6.3-nm gapless HgTe quantum well—a two-dimensional hybrid band system featuring coexisting linear (Dirac-like) and parabolic hole energy bands at low energies. Using a classical two-subband model that includes intervalley scattering, we reveal a striking tenfold enhancement of the Hall resistance, mainly driven by the dominant transport contribution of Dirac holes. A comprehensive magnetotransport analysis allows us to extract key parameters, such as the mobilities of both carrier types, providing insight into their complex interplay. These results establish the HgTe quantum well as a distinctive platform for investigating novel transport phenomena in hybrid band systems, enhancing our understanding of mixed-carrier magnetotransport.

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• Classical transport
• Electrical conductivity
• Hall effect
• Magnetotransport
• Quantum transport
• Valley degrees of freedom