Two-dimensional honeycomb borophene oxide: strong anisotropy and nodal loop transformation

Disordered hyperuniformity (DHU) is a recently discovered novel state of many-body systems that possesses vanishing normalized infinite-wavelength density fluctuations similar to a perfect crystal and an amorphous structure like a liquid or glass. Here, we discover a hyperuniformity-preserving topological transformation in two-dimensional (2D) network structures that involves continuous introduction of Stone–Wales (SW) defects. Specifically, the static structure factor S(k) of the resulting defected networks possesses the scaling S(k)∼kα for small wave number k, where 1≤α(p)≤2 monotonically decreases as the SW defect concentration p increases, reaches α≈1 at p≈0.12, and remains almost flat beyond this p. Our findings have important implications for amorphous 2D materials since the SW defects are well known to capture the salient feature of disorder in these materials. Verified by recently synthesized single-layer amorphous graphene, our network models reveal unique electronic transport mechanisms and mechanical behaviors associated with distinct classes of disorder in 2D materials.

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Velocity statistics inside coherent vortices generated by the inverse cascade of 2-D turbulence

Journal of Fluid Mechanics ◽

10.1017/jfm.2016.699 ◽

2016 ◽

Vol 809 ◽

Cited By ~ 11

Author(s):

I. V. Kolokolov ◽

V. V. Lebedev

Keyword(s):

Velocity Profile ◽

Structure Function ◽

Correlation Functions ◽

Two Dimensional ◽

Strong Anisotropy ◽

Velocity Fluctuations ◽

Inverse Cascade ◽

Velocity Statistics ◽

Flow Fluctuations ◽

Coherent Vortices

We analyse velocity fluctuations inside coherent vortices generated as a result of the inverse cascade in the two-dimensional (2-D) turbulence in a finite box. As we demonstrated in Kolokolov & Lebedev (Phys. Rev. E, vol. 93, 2016, 033104), the universal velocity profile, established in Laurie et al. (Phys. Rev. Lett., vol. 113, 2014, 254503), corresponds to the passive regime of the flow fluctuations. This property enables one to calculate correlation functions of the velocity fluctuations in the universal region. We present the results of the calculations that demonstrate a non-trivial scaling of the structure function. In addition the calculations reveal strong anisotropy of the structure function.

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Two-Dimensional Superfluidity of Exciton Polaritons Requires Strong Anisotropy

Physical Review X ◽

10.1103/physrevx.5.011017 ◽

2015 ◽

Vol 5 (1) ◽

Cited By ~ 79

Author(s):

Ehud Altman ◽

Lukas M. Sieberer ◽

Leiming Chen ◽

Sebastian Diehl ◽

John Toner

Keyword(s):

Two Dimensional ◽

Strong Anisotropy ◽

Exciton Polaritons

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2D layered SiP as anisotropic nonlinear optical material

Scientific Reports ◽

10.1038/s41598-021-85938-4 ◽

2021 ◽

Vol 11 (1) ◽

Author(s):

Huseyin Sar ◽

Jie Gao ◽

Xiaodong Yang

Keyword(s):

Crystal Orientation ◽

Nonlinear Optical ◽

Third Harmonic Generation ◽

Optical Material ◽

Two Dimensional ◽

Nonlinear Optical Material ◽

Strong Anisotropy ◽

Third Harmonic ◽

Flake Thickness ◽

Polarized Raman

AbstractTwo-dimensional (2D) material of silicon phosphide (SiP) has recently been shown as a promising optical material with large band gap, fast photoresponse and strong anisotropy. However, the nonlinear optical properties of 2D SiP have not been investigated yet. Here, the thickness-dependent in-plane anisotropic third-harmonic generation (THG) from the mechanically exfoliated 2D layered SiP flakes is reported. The crystal orientation of the SiP flake is determined by the angle-resolved polarized Raman spectroscopy. The angular dependence of the THG emission with respect to the incident linear polarization is found to be strongly anisotropic with the two-fold polarization dependence pattern. Furthermore, the effect of the SiP flake thickness on the THG power is analyzed.

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