• DOI:10.1109/LMAG.2020.2969871
• Corpus ID: 207870349

Study of Surface Spin-Polarized Electron Accumulation in Topological Insulators Using Scanning Tunneling Microscopy

@article{Tyagi2020StudyOS,
  title={Study of Surface Spin-Polarized Electron Accumulation in Topological Insulators Using Scanning Tunneling Microscopy},
  author={Siddharth Tyagi and Michael E. Dreyer and David Bowen and Dan Hinkel and Patrick J. Taylor and Adam L. Friedman and Robert E. Butera and Charles Krafft and Isaak D. Mayergoyz},
  journal={IEEE Magnetics Letters},
  year={2020},
  volume={11},
  pages={1-4}
}

• S. Tyagi, M. Dreyer, +6 authors I. Mayergoyz
• Published 1 November 2019
• Physics
• IEEE Magnetics Letters

We report the results of scanning tunneling microscopy experiments using iron-coated tungsten tips and current-carrying bismuth selenide (Bi<inline-formula><tex-math notation="LaTeX">$_2$</tex-math></inline-formula>Se<inline-formula><tex-math notation="LaTeX">$_3$</tex-math></inline-formula>) samples. Asymmetry in tunneling currents with respect to the change in the direction of bias currents through Bi<inline-formula><tex-math notation="LaTeX">$_2$</tex-math></inline-formula>Se<inline-formula><tex-math notation="LaTeX">$_3$</tex-math></inline-formula> samples has been measured. It is argued that this asymmetry is the manifestation of surface spin-polarized electron accumulation caused by the 90<inline-formula><tex-math notation="LaTeX">$^\circ$</tex-math></inline-formula> electron spin–momentum locking in the topologically protected surface current mode. It is demonstrated that the manifestation of surface spin-polarized electron accumulation is enhanced by tin doping of Bi<inline-formula><tex-math notation="LaTeX">$_2$</tex-math></inline-formula>Se<inline-formula><tex-math notation="LaTeX">$_3$</tex-math></inline-formula> samples. Furthermore, we noted the appearance of spin-dependent density of states in current-carrying Bi<inline-formula><tex-math notation="LaTeX">$_2$</tex-math></inline-formula>Se<inline-formula><tex-math notation="LaTeX">$_3$</tex-math></inline-formula> samples.