Interaction-controlled transport in a two-dimensional massless-massive Dirac system: Transition from degenerate to nondegenerate regimes
arXiv:2405.02233 · doi:10.1103/PhysRevResearch.6.023121
Abstract
The resistivity of two-dimensional (2D) metals generally exhibits insensitivity to electron-electron scattering. However, it's worth noting that Galilean invariance may not hold true in systems characterized by a spectrum containing multiple electronic branches or in scenarios involving electron-hole plasma. In the context of our study, we focus on 2D electrons confined within a triple quantum well (TQW) based on HgTe. This system displays a coexistence of energy bands featuring both linear and parabolic-like spectra at low energy and, therefore, lacks the Galilean invariance. This research employs a combined theoretical and experimental approach to investigate the transport properties of this two-component system across various regimes. By manipulating carrier density and temperature, we tune our system from a fully degenerate regime, where resistance follows a temperature-dependent behavior proportional to , to a regime where both types of electrons adhere to Boltzmann statistics. In the non-degenerate regime, electron interactions lead to resistance that is weakly dependent on temperature. Notably, our experimental observations closely align with the theoretical predictions derived in this study. This work establishes the HgTe-based TQW as a promising platform for exploring different interaction dominant scenarios for the massless-massive Dirac system.9 pages, 8 figures
12 pages, 8 figures
References in corpus (28)
- Topological Insulators
- Quantum Spin Hall Effect and Topological Phase Transition in HgTe Quantum Wells
- Topological Order and the Quantum Spin Hall Effect
- Quantum Spin Hall Insulator State in HgTe Quantum Wells
- Quantum Spin Hall Effect
- Single valley Dirac fermions in zero-gap HgTe quantum wells
- Viscous electron fluids
- Electron-hole collision limited transport in charge-neutral bilayer graphene
- Electronic hydrodynamics and the breakdown of the Wiedemann-Franz and Mott laws in interacting metals
- Large gap quantum spin Hall insulator, massless Dirac fermions and bilayer graphene analogue in InAs/Ga(In)Sb heterostructures
- Tunable quantum spin Hall effect in double quantum wells
- Dissipation-enabled hydrodynamic conductivity in a tunable bandgap semiconductor
- Mesoscopic transport in two-dimensional topological insulators
- Topological insulators based on HgTe
- Massless Dirac fermions in III-V semiconductor quantum wells
- Robust helical edge transport at quantum Hall state
- Two-dimensional topological insulator state in double HgTe quantum well
- Temperature dependent resistivity of spin-split subbands in GaAs 2D hole system
- The effect of electron--hole scattering on the transport properties of a 2D semimetal in a HgTe quantum well
- Engineering topological phases in triple HgTe/CdTe quantum wells
- Electron-electron scattering and transport properties of spin-orbit coupled electron gas
- Suppression of hole-hole scattering in GaAs/AlGaAs heterostructures under uniaxial compression
- Interlayer electron-hole friction in tunable twisted bilayer graphene semimetal
- Multiple crossing of Landau levels of two-dimensional fermions in double HgTe quantum wells
- Coulomb drag in topological materials
- Electron--electron scattering and conductivity of disordered systems with Galilean-invariant spectrum
- Interaction dominated transport in 2D conductors: from degenerate to partially-degenerate regime
- Giant magnetoresistance in weakly disordered non-Galilean invariant conductors