Single-orbital realization of high-temperature 
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 superconductivity in the square-octagon lattice

Kang, Yao-Tai; Chen, Lu; Yang, Fan; Yao, Dao‐Xin

doi:10.1103/physrevb.99.184506

Cited by 27 publications

(31 citation statements)

References 51 publications

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“…Octagon-structure materials can be expected to be a good candidate for hydrogen storage. It is a possible high-temperature superconductor [ 24 ]. In 2015, Lu et al fabricated free-standing octagon-shaped carbon nanofiber [ 25 ].…”

Section: Introductionmentioning

confidence: 99%

2D Octagon-Structure Carbon and Its Polarization Resolved Raman Spectra

Wang

2020

Nanomaterials

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We predict a new phase of two-dimensional carbon with density functional theory (DFT). It was found to be semimetal with two Dirac points. The vibrational properties and the polarization resolved Raman spectra of the carbon monolayer are predicted. There are five Raman active modes: 574 cm−1 (Eg), 1112 cm−1 (B1g), 1186 cm−1 (B2g), 1605 cm−1 (B2g) and 1734 cm−1 (A1g). We consider the incident light wave vector to be perpendicular and parallel to the plane of the carbon monolayer. By calculating Raman tensor of each Raman active mode, we obtained polarization angle dependent Raman intensities. Our results will help materials scientists to identify the existence and orientation of octagon-structure carbon monolayer when they are growing it.

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Section: Introductionmentioning

confidence: 99%

2D Octagon-Structure Carbon and Its Polarization Resolved Raman Spectra

Wang

2020

Nanomaterials

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“…The square-octagon lattice has been attracting much attention lately due to the plethora of novel phases predicted to occur in the system. They range from a quantum magnetic phase under the competition between temperature and on-site repulsive interaction [41], to topological insulating phases induced by spin-orbit coupling or non-Abelian gauge fields [42][43][44], and even high-temperature superconductivity with singlet s ± -wave paring symmetry [45]. Moreover, it has been shown that trivial and nontrivial flat bands can be tuned on the square octagon lattice by considering the addition of next-nearest neighbour hopping and an external magnetic flux [46,47].…”

Section: Introductionmentioning

confidence: 99%

Flat band superconductivity in the square-octagon lattice

Nunes,

Smith

2020

Preprint

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The discovery of superconductivity in twisted bilayer graphene has triggered a resurgence of interest in flat-band superconductivity. Here, we investigate the square-octagon lattice, which also exhibits two perfectly flat bands when next-nearest neighbour hopping or an external magnetic field are added to the system. We calculate the superconducting phase diagram in the presence of on-site attractive interactions and find two superconducting domes, as observed in several types of unconventional superconductors. The critical temperature shows a linear dependence on the coupling constant, suggesting that superconductivity might reach high temperatures in the squareoctagon lattice. Our model could be experimentally realized using photonic or ultracold atoms lattices.

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“…It is a possible high‐temperature superconductor. [ 15 ] Recently, Zhong's research group fabricated graphene‐like nanoribbons, which periodically embedded with four‐ and eight‐membered rings. [ 16 ] The Raman spectra can help people to determine the grown 2‐D materials.…”

Section: Introductionmentioning

confidence: 99%

Vibrational properties and Raman spectra of 2‐D octagon‐structure nitrogen

Wang

2020

J Raman Spectroscopy

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We studied the vibrational properties and Raman spectra of two‐dimensional (2‐D) octagon‐structure nitrogen with density functional theory (DFT). There are 10 Raman active modes whose irreducible representations are A1g, B1g, B2g, and Eg. By calculating Raman tensor of each Raman active mode, we obtained polarization angle‐dependent Raman intensities. The results show that B1g and B2g modes can show polarization angle‐dependent Raman intensities when the incident light wave vector is perpendicular to the plane of the nitrogen monolayer, which is different from some other isotropic 2‐D materials. We also discussed polarization angle‐dependent Raman intensities when the incident light wave vector is parallel to the plane of the monolayer. We found that the Raman spectra have seven peaks when the incident light wave vector is perpendicular to the monolayer, while there are four distinct peaks when the incident light wave vector is parallel to the monolayer. Our results will help experimentalists to identify the existence and orientation of octagon‐structure nitrogen monolayer when they are growing it.

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Single-orbital realization of high-temperature s± superconductivity in the square-octagon lattice

Cited by 27 publications

References 51 publications

2D Octagon-Structure Carbon and Its Polarization Resolved Raman Spectra

2D Octagon-Structure Carbon and Its Polarization Resolved Raman Spectra

Flat band superconductivity in the square-octagon lattice

Vibrational properties and Raman spectra of 2‐D octagon‐structure nitrogen

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