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@ARTICLE{Lpke:917159,
      author       = {Lüpke, Felix and Pham, Anh D. and Zhao, Yi-Fan and Zhou,
                      Ling-Jie and Lu, Wenchang and Briggs, Emil and Bernholc,
                      Jerzy and Kolmer, Marek and Teeter, Jacob and Ko, Wonhee and
                      Chang, Cui-Zu and Ganesh, Panchapakesan and Li, An-Ping},
      title        = {{L}ocal manifestations of thickness-dependent topology and
                      edge states in the topological magnet {M}n{B}i 2 {T}e 4},
      journal      = {Physical review / B},
      volume       = {105},
      number       = {3},
      issn         = {2469-9950},
      address      = {Woodbury, NY},
      publisher    = {Inst.},
      reportid     = {FZJ-2023-00391},
      pages        = {035423},
      year         = {2022},
      abstract     = {The interplay of nontrivial band topology and magnetism
                      gives rise to a series of exotic quantum phenomena, such as
                      the emergent quantum anomalous Hall (QAH) effect and
                      topological magnetoelectric effect. Many of these quantum
                      phenomena have local manifestations when the global symmetry
                      is broken. Here, we report local signatures of the
                      thickness-dependent topology in intrinsic magnetic
                      topological insulator MnBi2Te4 (MBT), using scanning
                      tunneling microscopy and spectroscopy on molecular beam
                      epitaxy grown MBT thin films. A thickness-dependent band gap
                      is revealed, which we reproduce with theoretical
                      calculations. Our theoretical results indicate a topological
                      quantum phase transition beyond a film thickness of one
                      monolayer, with alternating QAH and axion insulating states
                      for odd and even layers, respectively. At step edges, we
                      observe localized electronic states, in general agreement
                      with axion insulator and QAH edge states, respectively,
                      indicating topological phase transitions across the steps.
                      The demonstration of thickness-dependent topological
                      properties highlights the role of nanoscale control over
                      novel quantum states, reinforcing the necessity of thin film
                      technology in quantum information science applications},
      cin          = {PGI-3},
      ddc          = {530},
      cid          = {I:(DE-Juel1)PGI-3-20110106},
      pnm          = {5213 - Quantum Nanoscience (POF4-521)},
      pid          = {G:(DE-HGF)POF4-5213},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000752490700003},
      doi          = {10.1103/PhysRevB.105.035423},
      url          = {https://juser.fz-juelich.de/record/917159},
}