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Observation of quantum-tunnelling-modulated spin texture in ultrathin topological insulator Bi2Se3 films.

Neupane, Madhab; Richardella, Anthony; Sánchez-Barriga, Jaime; Xu, Suyang; Alidoust, Nasser; Belopolski, Ilya; Liu, Chang; Bian, Guang; Zhang, Duming and Marchenko, Dmitry, et al. (2014) In Nature Communications 5.
Abstract
Understanding the spin-texture behaviour of boundary modes in ultrathin topological insulator films is critically essential for the design and fabrication of functional nanodevices. Here, by using spin-resolved photoemission spectroscopy with p-polarized light in topological insulator Bi2Se3 thin films, we report tunnelling-dependent evolution of spin configuration in topological insulator thin films across the metal-to-insulator transition. We report a systematic binding energy- and wavevector-dependent spin polarization for the topological surface electrons in the ultrathin gapped-Dirac-cone limit. The polarization decreases significantly with enhanced tunnelling realized systematically in thin insulating films, whereas magnitude of the... (More)
Understanding the spin-texture behaviour of boundary modes in ultrathin topological insulator films is critically essential for the design and fabrication of functional nanodevices. Here, by using spin-resolved photoemission spectroscopy with p-polarized light in topological insulator Bi2Se3 thin films, we report tunnelling-dependent evolution of spin configuration in topological insulator thin films across the metal-to-insulator transition. We report a systematic binding energy- and wavevector-dependent spin polarization for the topological surface electrons in the ultrathin gapped-Dirac-cone limit. The polarization decreases significantly with enhanced tunnelling realized systematically in thin insulating films, whereas magnitude of the polarization saturates to the bulk limit faster at larger wavevectors in thicker metallic films. We present a theoretical model that captures this delicate relationship between quantum tunnelling and Fermi surface spin polarization. Our high-resolution spin-based spectroscopic results suggest that the polarization current can be tuned to zero in thin insulating films forming the basis for a future spin-switch nanodevice. (Less)
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Nature Communications
volume
5
publisher
Nature Publishing Group
external identifiers
  • pmid:24815418
  • wos:000337373500003
  • scopus:84900387221
ISSN
2041-1723
DOI
10.1038/ncomms4841
language
English
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yes
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775a0ef2-4447-48e6-baf4-c4ec95544972 (old id 4455482)
date added to LUP
2014-06-08 11:03:09
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2017-11-19 04:02:16
@article{775a0ef2-4447-48e6-baf4-c4ec95544972,
  abstract     = {Understanding the spin-texture behaviour of boundary modes in ultrathin topological insulator films is critically essential for the design and fabrication of functional nanodevices. Here, by using spin-resolved photoemission spectroscopy with p-polarized light in topological insulator Bi2Se3 thin films, we report tunnelling-dependent evolution of spin configuration in topological insulator thin films across the metal-to-insulator transition. We report a systematic binding energy- and wavevector-dependent spin polarization for the topological surface electrons in the ultrathin gapped-Dirac-cone limit. The polarization decreases significantly with enhanced tunnelling realized systematically in thin insulating films, whereas magnitude of the polarization saturates to the bulk limit faster at larger wavevectors in thicker metallic films. We present a theoretical model that captures this delicate relationship between quantum tunnelling and Fermi surface spin polarization. Our high-resolution spin-based spectroscopic results suggest that the polarization current can be tuned to zero in thin insulating films forming the basis for a future spin-switch nanodevice.},
  articleno    = {3841},
  author       = {Neupane, Madhab and Richardella, Anthony and Sánchez-Barriga, Jaime and Xu, Suyang and Alidoust, Nasser and Belopolski, Ilya and Liu, Chang and Bian, Guang and Zhang, Duming and Marchenko, Dmitry and Varykhalov, Andrei and Rader, Oliver and Leandersson, Mats and Thiagarajan, Balasubramanian and Chang, Tay-Rong and Jeng, Horng-Tay and Basak, Susmita and Lin, Hsin and Bansil, Arun and Samarth, Nitin and Hasan, M Zahid},
  issn         = {2041-1723},
  language     = {eng},
  publisher    = {Nature Publishing Group},
  series       = {Nature Communications},
  title        = {Observation of quantum-tunnelling-modulated spin texture in ultrathin topological insulator Bi2Se3 films.},
  url          = {http://dx.doi.org/10.1038/ncomms4841},
  volume       = {5},
  year         = {2014},
}