Massless Dirac fermions in III-V semiconductor quantum wells

Abstract

We report on the clear evidence of massless Dirac fermions in two-dimensional system based on III-V semiconductors. Using a gated Hall bar made on a three-layer InAs/GaSb/InAs quantum well, we restore the Landau levels fan chart by magnetotransport and unequivocally demonstrate a gapless state in our sample. Measurements of cyclotron resonance at different electron concentrations directly indicate a linear band crossing at the $\Gamma$ point of Brillouin zone. Analysis of experimental data within analytical Dirac-like Hamiltonian allows us not only determing velocity $v_F=1.8\cdot 10^5$ m/s of massless Dirac fermions but also demonstrating significant non-linear dispersion at high energies.

Main text and Supplemental Materials, 14 pages, 9 figures

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Cited by in corpus (15)

• Terahertz cyclotron emission from two-dimensional Dirac fermions
• Disorder-induced phase transition in Dirac systems beyond the linear approximation
• Many-particle effects in optical transitions from zero-mode Landau levels in HgTe quantum wells
• Coexistence of Topological and Normal Insulating Phases in Electro-Optically Tuned InAs/GaSb Bilayer Quantum Wells
• Voltage control of the quantum scattering time in InAs/GaSb/InAs trilayer quantum wells
• Interaction dominated transport in 2D conductors: from degenerate to partially-degenerate regime
• Multi-probe analysis to separate edge currents from bulk currents in quantum spin Hall insulators and to analyze their temperature dependence
• Disorder-induced phase transitions in double HgTe quantum wells
• Electrical tuning of helical edge states in topological multilayers
• Interaction-controlled transport in a two-dimensional massless-massive Dirac system: Transition from degenerate to nondegenerate regimes
• Quasiparticle picture of topological phase transitions induced by interactions
• Many-particle hybridization of optical transitions from zero-mode Landau levels in HgTe quantum wells
• Magnetotransport in a 2D Hybrid Band System: Dirac and Heavy Hole Interplay
• Higher-order topological insulator in cubic semiconductor quantum wells
• Relativistic collapse of Landau levels of Kane fermions in crossed electric and magnetic fields