Mamyouda S, Ito H, Shibata Y, Kashiwaya S, Yamaguchi M, Akazaki T, Tamura H, Ootuka Y, Nomura S. Circularly polarized near-field optical mapping of spin-resolved quantum Hall chiral edge states.
NANO LETTERS 2015;
15:2417-2421. [PMID:
25727460 DOI:
10.1021/nl504767w]
[Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
We have successfully developed a circularly polarized near-field scanning optical microscope (NSOM) that enables us to irradiate circularly polarized light with spatial resolution below the diffraction limit. As a demonstration, we perform real-space mapping of the quantum Hall chiral edge states near the edge of a Hall-bar structure by injecting spin polarized electrons optically at low temperature. The obtained real-space mappings show that spin-polarized electrons are injected optically to the two-dimensional electron layer. Our general method to locally inject spins using a circularly polarized NSOM should be broadly applicable to characterize a variety of nanomaterials and nanostructures.
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