4.8 Article

Helical Luttinger Liquid on the Edge of a Two-Dimensional Topological Antiferromagnet

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出版社

AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.2c02701

关键词

Helical Luttinger liquid; topological anti erromagnet; scanning SQUID; edge current

资金

  1. National Natural Science Foundation of China [11827805, 12150003, 21975140, 51991313]
  2. National Key R&D Program of China [2019SHZDZX01]
  3. Shanghai Municipal Science and Technology Major Project [51788104]
  4. Basic Science Center Project of the National Natural Science Foundation of China [11904053]
  5. NSFC [2021YFA1400100, 12074080]
  6. National Postdoctoral Program for Innovative Talents [BX20180079]
  7. China Postdoctoral Science Foundation [2018M641904]
  8. Shanghai Science and Technology Committee Rising-Star Program [19QA1401000]

向作者/读者索取更多资源

We search for evidence of a boundary helical Luttinger liquid (HLL) on the edge of a recently discovered topological antiferromagnet (AFM), MnBi2Te4 even-layer, and directly image the helical edge current using a scanning superconducting quantum interference device. The observed helical edge state accompanies an insulating bulk with a topological difference from the ferromagnetic Chern insulator phase. The edge conductance of the AFM order follows a power law as a function of temperature and source-drain bias, providing strong evidence for the existence of HLL. The observed HLL is robust at finite fields below the quantum critical point. The discovery of HLL in a layered AFM semiconductor has important implications for future spintronics and quantum computation.
A boundary helical Luttinger liquid (HLL) with broken bulk time-reversal symmetry belongs to a unique topological class that may occur in antiferromagnets (AFM). Here, we search for signatures of HLL on the edge of a recently discovered topological AFM, MnBi2Te4 even-layer. Using a scanning superconducting quantum interference device, we directly image helical edge current in the AFM ground state appearing at its charge neutral point. Such a helical edge state accompanies an insulating bulk which is topologically distinct from the ferromagnetic Chern insulator phase, as revealed in a magnetic field driven quantum phase transition. The edge conductance of the AFM order follows a power law as a function of temperature and source-drain bias which serves as strong evidence for HLL. Such HLL scaling is robust at finite fields below the quantum critical point. The observed HLL in a layered AFM semiconductor represents a highly tunable topological matter compatible with future spintronics and quantum computation.

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