Observation of Zeeman effect in topological surface state with distinct material dependence

Abstract

The helical Dirac fermions on the surface of topological insulators host novel relativistic quantum phenomena in solids. Manipulating spins of topological surface state (TSS) represents an essential step towards exploring the theoretically predicted exotic states related to time reversal symmetry (TRS) breaking via magnetism or magnetic field. Understanding Zeeman effect of TSS and determining its g-factor are pivotal for such manipulations in the latter form of TRS breaking. Here, we report those direct experimental observations in Bi2Se3 and Sb2Te2Se by spectroscopic imaging scanning tunneling microscopy. The Zeeman shifting of zero mode Landau level is identified unambiguously by judiciously excluding the extrinsic influences associated with the non-linearity in the TSS band dispersion and the spatially varying potential. The g-factors of TSS in Bi2Se3 and Sb2Te2Se are determined to be 18 and -6, respectively. This remarkable material dependence opens a new route to control the spins in the TSS.

arXiv commentmain text: 17 pages, 4 figures; supplementary: 15 pages, 7 figures

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• Quantum oscillations in metallic Sb2Te2Se topological insulator
• Conditions for fully gapped topological superconductivity in topological insulator nanowires
• Magnetic-field-induced topological phase transition in Fe-doped (Bi,Sb)${}_2$Se${}_3$ heterostructures
• Quantum-Hall to Insulator Transition in Ultra-low-carrier-density Topological Insulator Films and a Hidden Phase of the Zeroth Landau Level
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• Electrified magnetic catalysis in three-dimensional topological insulators
• Correlation and current anomalies in helical quantum dots
• Selective-Area Epitaxy of Bulk-Insulating (Bi${}_x$Sb${}_{1-x}$)${}_2$Te${}_3$ Films and Nanowires by Molecular Beam Epitaxy
• Valley polarization of Landau levels driven by residual strain in the ZrSiS surface band
• Strained topological insulator spin-orbit torque random access memory (STI-SOTRAM) bit cell for energy-efficient Processing in Memory
• Fabrication and Characterization of the Moiré surface state on a topological insulator
• Hearing the shape of a Dirac drum: Dual quantum Hall states on curved surfaces
• Giant-exchange-driven Vectorial Control of a Minimal Topological Magnet in Eu3In2As4