Layered heterostructure of planar and buckled phases of silicene

Jaroch, Tomasz; Krawiec, Mariusz; Zdyb, R.

doi:10.1088/2053-1583/ac00fb

Cited by 18 publications

(20 citation statements)

References 38 publications

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“…Besides the growing rate of diffusion of the Si atoms, the temperature increase also causes crystallographic ordering of the surface layer. Under a proper control of experimental conditions, the planar phase coexisting with the low buckled phase of silicene could be obtained [58,59].…”

Section: Resultsmentioning

confidence: 99%

“…The planar and low buckled phases of silicene forming layered heterostructures have been described in detail [59]. Ordered, mutually twisted layers of both silicene phases were successfully prepared by the self-organization process, which was realized by spontaneous surface segregation of Si atoms on the stack of a thermally-treated Au multilayer system.…”

Section: Introductionmentioning

confidence: 99%

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Temperature-Dependent Growth and Evolution of Silicene on Au Ultrathin Films—LEEM and LEED Studies

Jaroch

Zdyb

2022

Materials

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The formation and evolution of silicene on ultrathin Au films have been investigated with low energy electron microscopy and diffraction. Careful control of the annealing rate and temperature of Au films epitaxially grown on the Si(111) surface allows for the preparation of a large scale, of the order of cm2, silicene sheets. Depending on the final temperature, three stages of silicene evolution can be distinguished: (i) the growth of the low buckled phase, (ii) the formation of a layered heterostructure of the low buckled and planar phases of silicene and (iii) the gradual destruction of the silicene. Each stage is characterized by its unique surface morphology and characteristic diffraction patterns. The present study gives an overview of structures formed on the surface of ultrathin Au films and morphology changes between room temperature and the temperature at which the formation of Au droplets on the Si(111) surface occurs.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Temperature-Dependent Growth and Evolution of Silicene on Au Ultrathin Films—LEEM and LEED Studies

Jaroch

Zdyb

2022

Materials

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“…However, presence of the substrate can effectively suppress the PJT effect, and the planar supported form of silicene can exist [10,24,25]. This has been demonstrated in the case of silicene prepared on Au(111) films grown on Si(111) [21,26] and on mica substrates [27].…”

Section: Introductionmentioning

confidence: 94%

“…In this work, motivated by recent experimental realization of epitaxial planar silicene [21,26], we explore structural, energetic and magnetic properties of Fe-and Co-doped planar silicene/Au structure by using first-principles density functional theory (DFT) calculations. We show that very promising in view of the formation of 2D ferromagnets is Fe-substituted silicene, which features the strong ferromagnetism with a local antiferromagnetic ordering.…”

Section: Introductionmentioning

confidence: 99%

Magnetism in Au-Supported Planar Silicene

et al. 2021

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The adsorption and substitution of transition metal atoms (Fe and Co) on Au-supported planar silicene have been studied by means of first-principles density functional theory calculations. The structural, energetic and magnetic properties have been analyzed. Both dopants favor the same atomic configurations with rather strong binding energies and noticeable charge transfer. The adsorption of Fe and Co atoms do not alter the magnetic properties of Au-supported planar silicene, unless a full layer of adsorbate is completed. In the case of substituted system only Fe is able to produce magnetic ground state. The Fe-doped Au-supported planar silicene is a ferromagnetic structure with local antiferromagnetic ordering. The present study is the very first and promising attempt towards ferromagnetic epitaxial planar silicene and points to the importance of the substrate in structural and magnetic properties of silicene.

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“…The use of ultrathin layers of transition metals on substrates is a subject that has been of considerable interest in the past decades because of technological applications in enhancing catalytic activities, the formation of surface alloys, spintronic materials, biosensor application, and two-dimensional materials 1 – 21 . For example, layered planar and buckled phases of silicene are prepared in a self-organization process during annealing of ultrathin layers of Au grown on Si(111) surface 1 . The exposure of Ag/PdAg/Ag(111) islands to CO at room temperature induces the migration of Pd to the surface, a process that is driven by the energetic stabilization of the Pd–CO bond 4 .…”

Section: Introductionmentioning

confidence: 99%

Strain driven phase transition and mechanism for Fe/Ir(111) films

Hsieh

Jiang

Chen

et al. 2021

Sci Rep

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By way of introducing heterogeneous interfaces, the stabilization of crystallographic phases is critical to a viable strategy for developing materials with novel characteristics, such as occurrence of new structure phase, anomalous enhancement in magnetic moment, enhancement of efficiency as nanoportals. Because of the different lattice structures at the interface, heterogeneous interfaces serve as a platform for controlling pseudomorphic growth, nanostructure evolution and formation of strained clusters. However, our knowledge related to the strain accumulation phenomenon in ultrathin Fe layers on face-centered cubic (fcc) substrates remains limited. For Fe deposited on Ir(111), here we found the existence of strain accumulation at the interface and demonstrate a strain driven phase transition in which fcc-Fe is transformed to a bcc phase. By substituting the bulk modulus and the shear modulus and the experimental results of lattice parameters in cubic geometry, we obtain the strain energy density for different Fe thicknesses. A limited distortion mechanism is proposed for correlating the increasing interfacial strain energy, the surface energy, and a critical thickness. The calculation shows that the strained layers undergo a phase transition to the bulk structure above the critical thickness. The results are well consistent with experimental measurements. The strain driven phase transition and mechanism presented herein provide a fundamental understanding of strain accumulation at the bcc/fcc interface.

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Layered heterostructure of planar and buckled phases of silicene

Cited by 18 publications

References 38 publications

Temperature-Dependent Growth and Evolution of Silicene on Au Ultrathin Films—LEEM and LEED Studies

Temperature-Dependent Growth and Evolution of Silicene on Au Ultrathin Films—LEEM and LEED Studies

Magnetism in Au-Supported Planar Silicene

Strain driven phase transition and mechanism for Fe/Ir(111) films

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