Topological dangling bonds with large spin splitting and enhanced spin polarization on the surfaces of Bi2Se3

Hsin Lin, Tanmoy Das, Yoshinori Okada, Mike C. Boyer, W. Doug Wise, Michelle Tomasik, Bo Zhen, Eric W. Hudson, Wenwen Zhou, Vidya Madhavan, Chung Yuan Ren, Hiroshi Ikuta, Arun Bansil

Research output: Contribution to journalArticle

30 Citations (Scopus)

Abstract

We investigate the topological surface state properties at various surface cleaves in the topological insulator Bi2Se3, via first principles calculations and scanning tunneling microscopy/spectroscopy (STM/STS). While the typical surface termination occurs between two quintuple layers, we report the existence of a surface termination within a single quintuple layer where dangling bonds form with giant spin splitting owing to strong spin-orbit coupling. Unlike Rashba split states in a 2D electron gas, these states are constrained by the band topology of the host insulator with topological properties similar to the typical topological surface state, and thereby offer an alternative candidate for spintronics usage. We name these new states "topological dangling-bond states". The degree of the spin polarization of these states is greatly enhanced. Since dangling bonds are more chemically reactive, the observed topological dangling-bond states provide a new avenue for manipulating band dispersions and spin-textures by adsorbed atoms or molecules.

Original languageEnglish (US)
Pages (from-to)1915-1919
Number of pages5
JournalNano letters
Volume13
Issue number5
DOIs
StatePublished - May 8 2013

Fingerprint

Spin polarization
Dangling bonds
Surface states
polarization
Magnetoelectronics
Electron gas
insulators
Scanning tunneling microscopy
Dispersions
Orbits
Textures
adatoms
Topology
Spectroscopy
electron gas
scanning tunneling microscopy
Atoms
topology
textures
Molecules

All Science Journal Classification (ASJC) codes

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

Cite this

Lin, H., Das, T., Okada, Y., Boyer, M. C., Wise, W. D., Tomasik, M., ... Bansil, A. (2013). Topological dangling bonds with large spin splitting and enhanced spin polarization on the surfaces of Bi2Se3. Nano letters, 13(5), 1915-1919. https://doi.org/10.1021/nl304099x
Lin, Hsin ; Das, Tanmoy ; Okada, Yoshinori ; Boyer, Mike C. ; Wise, W. Doug ; Tomasik, Michelle ; Zhen, Bo ; Hudson, Eric W. ; Zhou, Wenwen ; Madhavan, Vidya ; Ren, Chung Yuan ; Ikuta, Hiroshi ; Bansil, Arun. / Topological dangling bonds with large spin splitting and enhanced spin polarization on the surfaces of Bi2Se3. In: Nano letters. 2013 ; Vol. 13, No. 5. pp. 1915-1919.
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abstract = "We investigate the topological surface state properties at various surface cleaves in the topological insulator Bi2Se3, via first principles calculations and scanning tunneling microscopy/spectroscopy (STM/STS). While the typical surface termination occurs between two quintuple layers, we report the existence of a surface termination within a single quintuple layer where dangling bonds form with giant spin splitting owing to strong spin-orbit coupling. Unlike Rashba split states in a 2D electron gas, these states are constrained by the band topology of the host insulator with topological properties similar to the typical topological surface state, and thereby offer an alternative candidate for spintronics usage. We name these new states {"}topological dangling-bond states{"}. The degree of the spin polarization of these states is greatly enhanced. Since dangling bonds are more chemically reactive, the observed topological dangling-bond states provide a new avenue for manipulating band dispersions and spin-textures by adsorbed atoms or molecules.",
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Lin, H, Das, T, Okada, Y, Boyer, MC, Wise, WD, Tomasik, M, Zhen, B, Hudson, EW, Zhou, W, Madhavan, V, Ren, CY, Ikuta, H & Bansil, A 2013, 'Topological dangling bonds with large spin splitting and enhanced spin polarization on the surfaces of Bi2Se3', Nano letters, vol. 13, no. 5, pp. 1915-1919. https://doi.org/10.1021/nl304099x

Topological dangling bonds with large spin splitting and enhanced spin polarization on the surfaces of Bi2Se3. / Lin, Hsin; Das, Tanmoy; Okada, Yoshinori; Boyer, Mike C.; Wise, W. Doug; Tomasik, Michelle; Zhen, Bo; Hudson, Eric W.; Zhou, Wenwen; Madhavan, Vidya; Ren, Chung Yuan; Ikuta, Hiroshi; Bansil, Arun.

In: Nano letters, Vol. 13, No. 5, 08.05.2013, p. 1915-1919.

Research output: Contribution to journalArticle

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T1 - Topological dangling bonds with large spin splitting and enhanced spin polarization on the surfaces of Bi2Se3

AU - Lin, Hsin

AU - Das, Tanmoy

AU - Okada, Yoshinori

AU - Boyer, Mike C.

AU - Wise, W. Doug

AU - Tomasik, Michelle

AU - Zhen, Bo

AU - Hudson, Eric W.

AU - Zhou, Wenwen

AU - Madhavan, Vidya

AU - Ren, Chung Yuan

AU - Ikuta, Hiroshi

AU - Bansil, Arun

PY - 2013/5/8

Y1 - 2013/5/8

N2 - We investigate the topological surface state properties at various surface cleaves in the topological insulator Bi2Se3, via first principles calculations and scanning tunneling microscopy/spectroscopy (STM/STS). While the typical surface termination occurs between two quintuple layers, we report the existence of a surface termination within a single quintuple layer where dangling bonds form with giant spin splitting owing to strong spin-orbit coupling. Unlike Rashba split states in a 2D electron gas, these states are constrained by the band topology of the host insulator with topological properties similar to the typical topological surface state, and thereby offer an alternative candidate for spintronics usage. We name these new states "topological dangling-bond states". The degree of the spin polarization of these states is greatly enhanced. Since dangling bonds are more chemically reactive, the observed topological dangling-bond states provide a new avenue for manipulating band dispersions and spin-textures by adsorbed atoms or molecules.

AB - We investigate the topological surface state properties at various surface cleaves in the topological insulator Bi2Se3, via first principles calculations and scanning tunneling microscopy/spectroscopy (STM/STS). While the typical surface termination occurs between two quintuple layers, we report the existence of a surface termination within a single quintuple layer where dangling bonds form with giant spin splitting owing to strong spin-orbit coupling. Unlike Rashba split states in a 2D electron gas, these states are constrained by the band topology of the host insulator with topological properties similar to the typical topological surface state, and thereby offer an alternative candidate for spintronics usage. We name these new states "topological dangling-bond states". The degree of the spin polarization of these states is greatly enhanced. Since dangling bonds are more chemically reactive, the observed topological dangling-bond states provide a new avenue for manipulating band dispersions and spin-textures by adsorbed atoms or molecules.

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