Flexible atomic buckling and homogeneous edge states in few-layer Bi(110) films

Lyu, Yanfeng; Daneshmandi, Samira; Huyan, Shuyuan; Chu, C. W.

doi:10.1007/s12274-021-3735-y

Cited by 6 publications

(12 citation statements)

References 33 publications

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“…The observed preference for full bilayer, i.e. even monolayer heights is in line with earlier studies [23]. In particular, the 2 BL high islands are very stable as they show a comparatively wide band gap in scanning tunneling spectroscopy [23].…”

Section: Bi(110) Majority Islands Elongated In the Graphene Armchair ...supporting

confidence: 91%

“…even monolayer heights is in line with earlier studies [23]. In particular, the 2 BL high islands are very stable as they show a comparatively wide band gap in scanning tunneling spectroscopy [23]. These so called 'magic' heights are related to the electronic structure arising from quantum confinement effects.…”

Section: Bi(110) Majority Islands Elongated In the Graphene Armchair ...supporting

confidence: 89%

“…Lyu et al have shown that the angle between the two domains at such a boundary is slightly smaller than 90 • . In their case, they measured an angle of 87.6 • [23]. This is not surprising considering that the Bi(110) unit cell is rectangular.…”

Section: Structural Modelmentioning

confidence: 79%

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Morphology of Bi(110) quantum islands on epitaxial graphene

Koch,

Ghosal,

Sologub

et al. 2023

J. Phys.: Condens. Matter

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Proximitized 2D materials present exciting prospects for exploring new quantum properties, enabled by precise control of structures and interfaces through epitaxial methods. In this study, we investigated the structure of ultrathin coverages formed by depositing high-Z element bismuth (Bi) on monolayer graphene (MLG)/SiC(0001). By utilizing electron diffraction and scanning tunneling microscopy, ultrathin Bi nanostructures epitaxially grown on MLG were studied. Deposition at 300 K resulted in formation of needle-like Bi(110)-terminated islands elongated in the zig-zag direction and aligned at an angle of approximately 1.75° with respect to the MLG armchair direction. By both strain and quantum size effects, the shape, the orientation and the thickness of the Bi(110) islands can be rationalized. Additionally, a minority phase of Bi(110) islands orthogonally aligned to the former ones were seen. The four sub-domains of this minority structure are attributed to the formation of mirror twin boundaries, resulting in two potential alignments of Bi(110) majority and minority domains with respect to each other, in addition to two possible alignments of the majority domain with respect to graphene. Notably, an annealing step at 410 K or lowering the deposition temperature, significantly increases the concentration of the Bi(110) minority domain. Our findings shed light on the structural control of proximitized 2D materials, showcasing the potential for manipulating 2D interfaces.

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Section: Bi(110) Majority Islands Elongated In the Graphene Armchair ...supporting

confidence: 91%

Section: Bi(110) Majority Islands Elongated In the Graphene Armchair ...supporting

confidence: 89%

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Morphology of Bi(110) quantum islands on epitaxial graphene

Koch,

Ghosal,

Sologub

et al. 2023

J. Phys.: Condens. Matter

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“…Figures 1(a)-(e) show the atomic structure, which includes paired layers of atoms in the BP-like structure. Interestingly, when grown on graphite, it has been reported that structures with single layer atomic steps are observed [24] which suggests that subtle differences in interactions between the Bi overlayer and underlying substrate can cause a transition between the A7 and A17 structures. Figures 1(f) and (g) show the typical morphology of the islands in our experiments, which are entirely consistent with the paired-layer BP-like structure: in particular, singlelayer atomic steps are never observed.…”

Section: Resultsmentioning

confidence: 99%

“…β-Bi structures have been thoroughly investigated [10][11][12][13][14][15][16][17][18], and it is found the nature of the ESs varies depending on the substrate on which it is grown. α-Bi structures were grown on several substrates (Si(111) [19], Ge(111) [20], the superconductor NbSe 2 [21], graphene supported by SiC [22][23][24][25], MoS 2 [26], TiSe 2 [27] and highly oriented pyrolytic graphite (HOPG) [3,28]), but less is known about their topological properties and ESs. Calculations suggest a strong dependence of the topology on the atomic buckling at the α-Bi surface i.e.…”

Section: Introductionmentioning

confidence: 99%

Edge states of α-bismuthene nanostructures

Salehitaleghani¹,

Maerkl²,

Kowalczyk³

et al. 2022

2D Mater.

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We present a systematic investigation of the edge states of two-dimensional α-bismuthene (α-Bi) structures self-assembled on HOPG substrates, using scanning tunnelling microscopy and scanning tunnelling spectroscopy. The measurements are carried out for 3ML, 5ML and 7ML thick Bi structures. Our spectroscopy studies reveal clear features at the edges of the 5ML and 7ML thick structures, and the positions of the edge states (ESs) coincide with the topographical step edges. In contrast, in 3ML structures the ESs appear to be absent and instead new states are sometimes observed, far from the topographical edge. These states are associated with a moiré pattern and result from strain-induced modulation of the topology. Our observations demonstrate the impact on the edge states of coupling to adjacent structures.

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