Magnetotransport in a 2D Hybrid Band System: Dirac and Heavy Hole Interplay

Abstract

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 incorporates intervalley scattering, we reveal a striking tenfold enhancement of the Hall resistance, primarily driven by the dominant transport contribution of Dirac holes. A comprehensive magnetotransport analysis enables us to extract key parameters, such as the mobilities of both carrier types, thereby providing insight into their complex interplay. These results establish the HgTe quantum well as a distinctive platform for exploring novel transport phenomena in hybrid band systems and deepen our understanding of mixed-carrier magnetotransport.

9 pages, 6 figures

References in corpus (14)

• Quantum Spin Hall Effect and Topological Phase Transition in HgTe Quantum Wells
• Quantum Spin Hall Insulator State in HgTe Quantum Wells
• Titanic Magnetoresistance in WTe2
• Single valley Dirac fermions in zero-gap HgTe quantum wells
• Magnetoresistance in two-component systems
• Giant magnetoresistance of Dirac plasma in high-mobility graphene
• Direct evidence for charge compensation induced large magnetoresistance in thin WTe2
• Linear magnetoresistance in HgTe quantum wells
• Mesoscopic transport in two-dimensional topological insulators
• Topological insulators based on HgTe
• Robust helical edge transport at $\nu =0$ quantum Hall state
• Transport through the network of topological channels in HgTe based quantum well
• Interaction dominated transport in 2D conductors: from degenerate to partially-degenerate regime
• Giant magnetoresistance in weakly disordered non-Galilean invariant conductors