Abnormal phase transition between two-dimensional high-density liquid crystal and low-density crystalline solid phases

Li, Wenbin; Kong, Lingxue; Feng, Baojie; Fu, Huixia; Li, Hui; Zeng, Xiao Cheng; Wu, Kehui; Chen, Lan

doi:10.1038/s41467-017-02634-6

Cited by 10 publications

(7 citation statements)

References 46 publications

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“…Considering that there is an electric field between the STM tip and sample, and the electric field-induced structural phase transition has been observed in other systems, − we studied the effect of the electric field on the phase transition by repeatedly scanning the same area to reveal the time-dependent topology evolution of sample 2. Figure shows the topography image scanned under the same bias voltage, 1 V, where there are two main regions covered by the β phase coated in green and yellow, respectively.…”

Section: Resultsmentioning

confidence: 99%

Role of Hollow Defects in Lattice Phase Separation and Electronic Features in Quasi-One-Dimensional Bi₄I₄ Crystals

Liu

et al. 2023

J. Phys. Chem. C

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The defects play a crucial role in the determination of the crystal structure and electronic properties of the matter, evoking tremendous interest in the manipulation of defects and exploration of underlying mechanisms. In this work, we applied scanning tunneling microscopy to investigate the influence of the defects on the lattice structure and electronic properties of Bi 4 I 4 crystals. A lattice phase separation in the nanoscale is identified in the vicinity of hollow defects, which is absent in the sample without defects. The scanning tunneling spectroscopy reveals a bandgap around 0.1 eV at the terrace of (001) surface of Bi 4 I 4 , which is consistent with the angle-resolved photoemission spectroscopy results and first-principles calculations. The hollow defects modulate the local density of the state, leading to the edge state residing in the gap region. This edge state is regarded as responsible for the varied resistivity in different Bi 4 I 4 samples in previous reports as their densities of the hollow defects are diverse. Our results shed light on the argument over the lattice phase of Bi 4 I 4 at low temperatures as well as the factors determining the electronic properties.

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Section: Resultsmentioning

confidence: 99%

Role of Hollow Defects in Lattice Phase Separation and Electronic Features in Quasi-One-Dimensional Bi₄I₄ Crystals

Liu

et al. 2023

J. Phys. Chem. C

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“…30 They also showed that free-standing gallenene can be dynamically stabilized upon the application of biaxial strain. Surface functionalization is an alternative approach to strain that can improve the stability of 2D materials and for tuning their structural, 31,32 electronic, 33,34 and magnetic 35 properties. Generally, hydrogenation is utilized experimentally for surface functionalization because it is a simple and versatile method.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Stability of Single-Layer w-Gallenene through Hydrogenation

et al. 2018

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Using density functional theory-based first-principles calculations, the effect of surface hydrogenation on the structural, dynamical, electronic, and mechanical properties of monolayer washboard-gallenene (w -gallenene) is investigated. It is found that the dynamically stabilized strained-monolayer of w -gallenene has a metallic non-magnetic ground state. Both one-sided and two-sided hydrogenation of w -gallenene suppresses its dynamical instability even when unstrained. Unlike one-sided hydrogenated monolayer w -gallenene (os-w -gallenene), two-sided hydrogenated monolayer w -gallenene (ts-w -gallenene) possesses the same crystal structure as wgallenene. Electronic band structure calculations reveal that monolayers of hydrogenated derivatives of w -gallenene exhibit also metallic non-magnetic ground state. Moreover, the linear-elastic constants, in-plane stiffness and Poisson ratio, are enhanced by hydrogenation which is opposite to the behavior of other hydrogenated monolayer crystals. Furthermore, monolayer w -gallenene and ts-w -gallenene remain dynamically stable up to relatively higher biaxial strains when compared to borophene. With its enhanced dynamical stability, robust metallic character, and enhanced linearelastic properties, hydrogenated monolayer w -gallenene is a potential candidate for nanodevice applications as a 2D flexible metal.

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“…Saturated adsorption of achiral CO molecules on various substrates have been observed to form stable phases consisting of clusters due to spontaneous condensation at low temperature. For examples, hexamer and heptamer structures have been suggested on the (111) plane of bulk α-CO [33][34][35] , as well as a CO adlayer on graphite 36 , Ag(111) 37 and Cu(111) 38 . Other chiral systems of clusters induced by symmetrybreaking adsorption process have also been reported, such as water adsorption on Ag(111) 39 and NaCl(001) 40 .…”

Section: Discussionmentioning

confidence: 99%

Condensation and asymmetric amplification of chirality in achiral molecules adsorbed on an achiral surface

Liu

et al. 2023

Nat Commun

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The origin of homochirality in nature is an important but open question. Here, we demonstrate a simple organizational chiral system constructed by achiral carbon monoxide (CO) molecules adsorbed on an achiral Au(111) substrate. Combining scanning tunneling microscope (STM) measurements with density-functional-theory (DFT) calculations, two dissymmetric cluster phases consisting of chiral CO heptamers are revealed. By applied high bias voltage, the stable racemic cluster phase can be transformed into a metastable uniform phase consisting of CO monomers. Further, during the recondensation of a cluster phase after lowering down bias voltage, an enantiomeric excess and its chiral amplification occur, resulting in a homochirality. Such asymmetry amplification is found to be both kinetically feasible and thermodynamically favorable. Our observations provide insight into the physicochemical origin of homochirality through surface adsorption and suggest a general phenomenon that can influence enantioselective chemical processes such as chiral separations and heterogeneous asymmetric catalysis.

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Abnormal phase transition between two-dimensional high-density liquid crystal and low-density crystalline solid phases

Cited by 10 publications

References 46 publications

Role of Hollow Defects in Lattice Phase Separation and Electronic Features in Quasi-One-Dimensional Bi₄I₄ Crystals

Role of Hollow Defects in Lattice Phase Separation and Electronic Features in Quasi-One-Dimensional Bi₄I₄ Crystals

Enhanced Stability of Single-Layer w-Gallenene through Hydrogenation

Condensation and asymmetric amplification of chirality in achiral molecules adsorbed on an achiral surface

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Abnormal phase transition between two-dimensional high-density liquid crystal and low-density crystalline solid phases

Cited by 10 publications

References 46 publications

Role of Hollow Defects in Lattice Phase Separation and Electronic Features in Quasi-One-Dimensional Bi4I4 Crystals

Role of Hollow Defects in Lattice Phase Separation and Electronic Features in Quasi-One-Dimensional Bi4I4 Crystals

Enhanced Stability of Single-Layer w-Gallenene through Hydrogenation

Condensation and asymmetric amplification of chirality in achiral molecules adsorbed on an achiral surface

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Product

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Role of Hollow Defects in Lattice Phase Separation and Electronic Features in Quasi-One-Dimensional Bi₄I₄ Crystals

Role of Hollow Defects in Lattice Phase Separation and Electronic Features in Quasi-One-Dimensional Bi₄I₄ Crystals