Dirac parameters and topological phase diagram of Pb1-xSnxSe from magneto-spectroscopy

Abstract

Pb1-xSnxSe hosts 3D massive Dirac fermions across the entire composition range for which the crystal structure is cubic. In this work, we present a comprehensive experimental mapping of the 3D band structure parameters of Pb1-xSnxSe as a function of composition and temperature. We cover a parameter space spanning the band inversion that yields its topological crystalline insulator phase. A non-closure of the energy gap is evidenced in the vicinity of this phase transition. Using magnetooptical Landau level spectroscopy, we determine the energy gap, Dirac velocity, anisotropy factor and topological character of Pb1-xSnxSe epilayers grown by molecular beam epitaxy on BaF2 (111). Our results are evidence that Pb1-xSnxSe is a model system to study topological phases and the nature of the phase transition.

arXiv commentSubmitted

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• Valley-Polarized quantum Hall phase in a strain-controlled Dirac system
• Topological semimetallic phase in PbO${}_2$ promoted by temperature
• Towards temperature-induced topological phase transition in SnTe: A first principles study
• Observation of Weyl and Dirac fermions at smooth topological Volkov-Pankratov heterojunctions
• Landau level spectroscopy of PbSnSe topological crystalline insulator
• Pressure and Inversion Symmetry Breaking Field Driven First Order Phase Transition and Formation of Dirac Circle in Perovskites
• Large longitudinal magnetoresistance of multivalley systems
• Weak antilocalization beyond the fully diffusive regime in Pb1-xSnxSe topological quantum wells
• Determination of the crystal field splitting energy in Cd3As2 using magnetooptics
• Spin-polarization of topological crystalline and normal insulator Pb${}_{1-x}$Sn${}_x$Se (111) epilayers probed by photoelectron spectroscopy
• Interaction between interface and massive states in multivalley topological heterostructures
• Hybridization of topological surface states with a flat band
• Miniband engineering and topological phase transitions in topological - normal insulator superlattices
• Band structure and topological phases of Pb${}_{1-x-y}$Sn${}_x$Mn${}_y$Te by ab initio calculations
• Evidence of phase stability, topological phonon and temperature-induced topological phase transition in rocksalt SnS and SnSe
• Topological interface states -- a possible path towards a Landau-level laser in the THz regime
• Magneto-transport evidence for strong topological insulator phase in ZrTe5
• Spontaneous Breaking of the SU(3) Flavor Symmetry in a Quantum Hall Valley Nematic
• Spectral analysis of the magneto-optical response in valley polarized Pb${}_{1-x}$Sn${}_x$Se