Inducing Lifshitz transition by extrinsic doping of surface bands in topological crystalline insulator Pb${}_{1-x}$Sn${}_x$Se

Abstract

Narrow gap semiconductor Pb${}_{1-x}$Sn${}_x$Se was investigated for topologically protected surface states in its rock-salt structural phase for x=0.45, 0.23, 0.15, and 0. Angle-resolved photoelectron spectroscopy of intrinsically p-doped samples showed clear indication of two Dirac cones, eccentric about the time-reversal invariant point X of the surface Brillouin zone for all but the x=0 sample. Adsorption of alkalies gradually filled the surface bands with electrons, driving the x>0 topological crystalline insulator systems through Lifshitz transitions, and from a hole- to electron-like Fermi surface. The electron-doped bands in x>0 samples exhibited the full configuration of the Dirac cones, also confirming electron-hole symmetry of the surface bands.

References in corpus (3)

• Topological Insulators with Inversion Symmetry
• Topological Crystalline Insulators
• Spin-polarized (001) surface states of the topological crystalline insulator Pb_{0.73}Sn_{0.27}Se

Cited by in corpus (7)

• Lifshitz transition mediated electronic transport anomaly in bulk ZrTe5
• Quantum Coherent Transport in SnTe Topological Crystalline Insulator Thin Films
• Superconductivity induced by In substitution into the topological crystalline insulator Pb(0.5)Sn(0.5)Te
• Surface-state-dominated transport in crystals of the topological crystalline insulator In-doped Pb${}_{1-x}$Sn${}_x$Te
• Fragility of the Dirac Cone Splitting in Topological Crystalline Insulator Heterostructures
• Sliding-induced topological transitions in bilayer biphenylene
• Possible Topological Superconductivity in a Topological Crystalline Insulator (Pb${}_{1-x}$Sn${}_x$)${}_{1-y}$In${}_y$Te