Nanoscale Optical Addressing of Valley Pseudospins through Transverse Optical Spin

Su Hyun Gong, Irina Komen, Filippo Alpeggiani, L. Kuipers

Research output: Contribution to journalArticleScientificpeer-review

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Valley pseudospin has emerged as a good quantum number to encode information, analogous to spin in spintronics. Two-dimensional transition metal dichalcogenides (2D TMDCs) recently attracted enormous attention for their easy access to the valley pseudospin through valley-dependent optical transitions. Different ways have been reported to read out the valley pseudospin state. For practical applications, on-chip access to and manipulation of valley pseudospins is paramount, not only to read out but especially to initiate the valley pseudospin state. Here, we experimentally demonstrate the selective on-chip, optical near-field initiation of valley pseudospins at room temperature. We exploit a nanowire optical waveguide, such that the local transverse optical spin of its guided modes selectively excites a specific valley pseudospin. Furthermore, spin-momentum locking of the transverse optical spin enables us to flip valley pseudospins with the opposite propagation direction. Thus, we open up ways to realize integrated hybrid opto-valleytronic devices.

Original languageEnglish
Pages (from-to)4410-4415
JournalNano Letters
Issue number6
Publication statusPublished - 2020


  • spin-momentum locking
  • TMDC materials
  • transverse optical spin
  • valleytronics
  • WS2
  • ZnO nanowires

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