Persistent surface states with diminishing gap in MnBi2Te4/Bi2Te3 superlattice antiferromagnetic topological insulator

Xu, Lixuan; Mao, Yuanhao; Wang, Hongyuan; Zhang, Yingbo; Chen, Yujie; Xia, Yun; Li, Yiwei; Pei, Ding; Zhang, Jing; Zheng, Huijun; Huang, Kui; Zhang, Chaofan; Cui, Shengtao; Liang, Aiji; Xia, Wei; Su, Hao; Jung, Sung Won; Cacho, Céphise; Wang, Meixiao; Li, Gang; Xu, Yong; Guo, Yanfeng; Yang, Lexian; Liu, Zhongkai; Chen, Yulin; Jiang, Mianheng

doi:10.1016/j.scib.2020.07.032

Cited by 55 publications

(41 citation statements)

References 59 publications

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“…However, many ARPES experiments and calculations concluded that the QL1 surface is gapped [42,43,45,47,48,51,54] while some other works claimed the gapless feature for the same surface [35,45,46,49,52,53]. We note that the gapped nature of surface states is crucial to realizing QAHE, Chern insulator, or AI, which requires insulating thin films including their surfaces.…”

mentioning

confidence: 77%

“…More recently, a family of materials were synthesized by inserting Bi 2 Te 3 layers (BT, or quintuple layer, QL) into MnBi 2 Te 4 to form superlattice like crystals (MnBi 2 Te 4 )(Bi 2 Te 3 ) n (n = 1, 2, 3) and likely stabilize the interlayer FM order [42][43][44]. However, ARPES [35,[45][46][47][48][49][50] still revealed gapless surface states on the MBT-terminated surface (labeled as the SL surface) for n ≥ 1 compounds, similar to pure MBT, for which the surface magnetism is speculated to change or disappear. Furthermore, whether BT-terminated surfaces are gapped or gapless is also under debate between different experiments.…”

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confidence: 99%

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Facet dependent surface energy gap on magnetic topological insulators

Tan,

Yan

2022

Preprint

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Magnetic topological insulators (MnBi 2 Te 4 )(Bi 2 Te 3 ) n (n = 0, 1, 2, 3) are promising to realize exotic topological states such as the quantum anomalous Hall effect (QAHE) and axion insulator (AI), where the Bi 2 Te 3 layer introduces versatility to engineer electronic and magnetic properties.However, whether surface states on the Bi 2 Te 3 terminated facet are gapless or gapped is debated, and its consequences in thin-film properties are rarely discussed. In this work, we find that the Bi 2 Te 3 terminated facets are gapless for n ≥ 1 compounds by calculations. Despite that the surface Bi 2 Te 3 (one layer or more) and underlying MnBi 2 Te 4 layers hybridize and give rise to a gap, such a hybridization gap overlaps with bulk valence bands, leading to a gapless surface after all. Such a metallic surface poses a fundamental challenge to realize QAHE or AI, which requires an insulating gap in thin films with at least one Bi 2 Te 3 surface. In theory, the insulating phase can still be realized in a film if both surfaces are MnBi 2 Te 4 layers. Otherwise, it requires that the film thickness is less than 10∼20 nm to push down bulk valence bands via the size effect. Our work paves the way to understand surface states and design bulk-insulating quantum devices in magnetic topological materials.

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confidence: 77%

mentioning

confidence: 99%

Facet dependent surface energy gap on magnetic topological insulators

Tan,

Yan

2022

Preprint

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“…Different from the above antiferromagnetic 2D crystal, intrinsic magnetic topological insulators (MnBi 2 Te 4 )(Bi 2 Te 3 ) n are quite particular. 135,148,149 The magnetosphere of such magnetic crystal is separated by a great deal of nonmagnetospheres, meanwhile, the magnetosphere (SL) with magnetic independence MnBi 2 Te 4 is separated by the n-layer of a non-magnetosphere quaternion (QL) of Bi 2 Te 3 , showing the flexible magnetic and topological states (Fig. 10).…”

Section: Antiferromagnetismmentioning

confidence: 99%

Two-dimensional magnetic atomic crystals

Zhang

Yang

et al. 2022

Mater. Horiz.

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“…While MnBi 4 Te 7 (m=1) [12][13][14][15][16][17][18][19] and MnBi 6 Te 10 (m=2) [17][18][19][20][21] have been found to be AFM similar to MnBi 2 Te 4 (m=0), MnBi 8 Te 13 (m=3) clearly distinguishes from other compounds with a unique FM interaction between neighboring MnBi 2 Te 4 layers and QAHE at zero field has been predicted at low temperature, 22,23 highlighting the importance of interlayer interaction.…”

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confidence: 90%

Light-Tunable Surface State and Hybridization Gap in Magnetic Topological Insulator MnBi$_8$Te$_{13}$

Zhong,

Bao,

Wang

et al. 2021

Preprint

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MnBi 8 Te 13 is an intrinsic ferromagnetic (FM) topological insulator with different complex surface terminations. Resolving the electronic structures of different termination surfaces and manipulation of the electronic state are important. Here, by using micrometer-spot time-and angle-resolved photoemission spectroscopy (µ-TrARPES), we resolve the electronic structures and reveal the ultrafast dynamics upon photoexcitation. Photo-induced filling of the surface state hybridization gap is observed for the Bi 2 Te 3 quintuple layer directly above MnBi 2 Te 4 accompanied by a nontrivial shift of the surface state, suggesting light-tunable interlayer interaction. Relaxation

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Persistent surface states with diminishing gap in MnBi2Te4/Bi2Te3 superlattice antiferromagnetic topological insulator

Cited by 55 publications

References 59 publications

Facet dependent surface energy gap on magnetic topological insulators

Facet dependent surface energy gap on magnetic topological insulators

Two-dimensional magnetic atomic crystals

Light-Tunable Surface State and Hybridization Gap in Magnetic Topological Insulator MnBi$_8$Te$_{13}$

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