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26 April 2024 |
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Band engineering of Dirac surface states in topological insulators-based van der Waals heterostructures | | Cui-Zu Chang
; Peizhe Tang
; Xiao Feng
; Kang Li
; Xu-Cun Ma
; Wenhui Duan
; Ke He
; Qi-Kun Xue
; | | Date: |
23 Sep 2015 | | Abstract: | The existence of gapless Dirac surface band of a three dimensional (3D)
topological insulator (TI) is guaranteed by the non-trivial topological
character of the bulk band, yet the surface band dispersion is mainly
determined by the environment near the surface. In this Letter, through in-situ
angle-resolved photoemission spectroscopy (ARPES) and the first-principles
calculation on 3D TI-based van der Waals heterostructures, we demonstrate that
one can engineer the surface band structures of 3D TIs by surface modifications
without destroying their topological non-trivial property. The result provides
an accessible method to independently control the surface and bulk electronic
structures of 3D TIs, and sheds lights in designing artificial topological
materials for electronic and spintronic purposes. | | Source: | arXiv, 1509.7108 | | Services: | Forum | Review | PDF | Favorites | |
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