Robust gapless surface state and Rashba-splitting bands upon surface deposition of magnetic Cr on Bi${}_2$Se${}_3$

Abstract

The interaction between magnetic impurities and the gapless surface state is of critical importance for realizing novel quantum phenomena and new functionalities in topological insulators. By combining angle-resolved photoemission spectroscopic experiments with density functional theory calculations, we show that surface deposition of Cr atoms on Bi${}_2$Se${}_3$ does not lead to gap opening of the surface state at the Dirac point, indicating the absence of long-range out-of-plane ferromagnetism down to our measurement temperature of 15 K. This is in sharp contrast to bulk Cr doping, and the origin is attributed to different Cr occupation sites. These results highlight the importance of nanoscale configuration of doped magnetic impurities in determining the electronic and magnetic properties of topological insulators.

Nano Letter, DOI: 10.1021/nl504900s

References in corpus (8)

• Experimental Observation of the Quantum Anomalous Hall Effect in a Magnetic Topological Insulator
• Topological Field Theory of Time-Reversal Invariant Insulators
• Quantized Anomalous Hall Effect in Magnetic Topological Insulators
• Topological Surface States Protected From Backscattering by Chiral Spin Texture
• Trajectory of Anomalous Hall Effect toward the Quantized State in a Ferromagnetic Topological Insulator
• Scale-Invariant Dissipationless Chiral Transport in Magnetic Topological Insulators beyond the Two-Dimensional Limit
• Tailoring Magnetic Doping in the Topological Insulator Bi2Se3
• Chemical potential dependent gap-opening at the Dirac surface states of Bi2Se3 induced by aggregated substitutional Cr atoms

Cited by in corpus (14)

• Effects of Dephasing on Spin Lifetime in Ballistic Spin-Orbit Materials
• Formation of Ideal Rashba States on Layered Semiconductor Surfaces Steered by Strain Engineering
• Light-Tunable Surface State and Hybridization Gap in Magnetic Topological Insulator MnBi${}_8$Te${}_{13}$
• Rashba and Dresselhaus effects in 2D Pb-I-based perovskites
• Non-Linear Spin Susceptibility in Topological Insulators
• Distinct Effects of Cr Bulk Doping and Surface Deposition on the Chemical Environment and Electronic Structure of the Topological Insulator Bi2Se3
• Spatial structure of correlations around a quantum impurity at the edge of a two-dimensional topological insulator
• A Helium-Surface Interaction Potential of Bi${}_2$Te${}_3$(111) from Ultrahigh-Resolution Spin-Echo Measurements
• Spin-polarization of topological crystalline and normal insulator Pb${}_{1-x}$Sn${}_x$Se (111) epilayers probed by photoelectron spectroscopy
• Gap and spin texture engineering of Dirac topological states at the Cr-Bi${}_2$Se${}_3$ interface
• Spin Stiffness and Domain Walls in Dirac-Electron Mediated Magnets
• Visualization of Unconventional Rashba Band and Vortex Zero Mode in Topopogical Superconductor Candidate AuSn${}_4$
• Bulk Rashba spin splitting and Dirac surface state in $p$-type (Bi${}_{0.9}$Sb${}_{0.1}{)}_2$Se${}_3$ single crystal
• Preparation, Characterization and electronic structure of Ti-doped Bi${}_2$Se${}_3$