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  • 标题:Local optical control of ferromagnetism and chemical potential in a topological insulator
  • 本地全文:下载
  • 作者:Andrew L. Yeats ; Peter J. Mintun ; Yu Pan
  • 期刊名称:Proceedings of the National Academy of Sciences
  • 印刷版ISSN:0027-8424
  • 电子版ISSN:1091-6490
  • 出版年度:2017
  • 卷号:114
  • 期号:39
  • 页码:10379-10383
  • DOI:10.1073/pnas.1713458114
  • 语种:English
  • 出版社:The National Academy of Sciences of the United States of America
  • 摘要:Many proposed experiments involving topological insulators (TIs) require spatial control over time-reversal symmetry and chemical potential. We demonstrate reconfigurable micron-scale optical control of both magnetization (which breaks time-reversal symmetry) and chemical potential in ferromagnetic thin films of Cr-(Bi,Sb)2Te3 grown on SrTiO3. By optically modulating the coercivity of the films, we write and erase arbitrary patterns in their remanent magnetization, which we then image with Kerr microscopy. Additionally, by optically manipulating a space charge layer in the underlying SrTiO3 substrates, we control the local chemical potential of the films. This optical gating effect allows us to write and erase p-n junctions in the films, which we study with photocurrent microscopy. Both effects are persistent and may be patterned and imaged independently on a few-micron scale. Dynamic optical control over both magnetization and chemical potential of a TI may be useful in efforts to understand and control the edge states predicted at magnetic domain walls in quantum anomalous Hall insulators.
  • 关键词:topological insulators ; ferromagnetism ; Kerr microscopy ; magneto-optical recording ; photocurrent microscopy
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