Manipulating surface-related ferromagnetism in modulation-doped topological insulators

Xufeng Kou, Liang He, Murong Lang, Yabin Fan, Kin Wong, Ying Jiang, Tianxiao Nie, Wanjun Jiang, Pramey Upadhyaya, Zhikun Xing, Yong Wang, Faxian Xiu, Robert N. Schwartz, Kang L. Wang

Research output: Contribution to journalArticlepeer-review

58 Citations (Scopus)

Abstract

A new class of devices based on topological insulators (TI) can be achieved by the direct engineering of the time-reversal-symmetry (TRS) protected surface states. In the meantime, a variety of interesting phenomena are also expected when additional ferromagnetism is introduced to the original topological order. In this Letter, we report the magnetic responses from the magnetically modulation-doped (BizSb1-z)2Te 3/Crx(BiySb1-y)2Te 3 bilayer films. By electrically tuning the Fermi level across the Dirac point, we show that the top TI surface carriers can effectively mediate the magnetic impurities and generate robust ferromagnetic order. More importantly, such surface magneto-electric effects can be either enhanced or suppressed, depending on the magnetic interaction range inside the TI heterostructures. The manipulation of surface-related ferromagnetism realized in our modulation-doped TI device is important for the realization of TRS-breaking topological physics, and it may also lead to new applications of TI-based multifunctional heterostructures.

Original languageEnglish
Pages (from-to)4587-4593
Number of pages7
JournalNano letters
Volume13
Issue number10
DOIs
Publication statusPublished - 2013 Oct 9

All Science Journal Classification (ASJC) codes

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

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