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Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...

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d+id' chiral superconductivity in bilayer silicene.

Feng Liu¹, Cheng-Cheng Liu, Kehui Wu

¹School of Physics, Beijing Institute of Technology, Beijing 100081, China.

Physical Review Letters

|August 27, 2013

Summary

Undoped bilayer silicene is metallic, but electron interactions reveal a topological superconductor. Strain engineering can tune this material for high superconductivity, offering exciting possibilities for future electronic devices.

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Area of Science:

Condensed Matter Physics
Materials Science
Quantum Chemistry

Background:

Bilayer silicene exhibits unique electronic properties due to its layered structure.
Understanding electron-electron interactions is crucial for predicting emergent phenomena like superconductivity.

Purpose of the Study:

To investigate the electronic structure and physical properties of undoped bilayer silicene.
To explore the potential for superconductivity in bilayer silicene under realistic conditions.
To identify mechanisms for enhancing superconducting critical temperatures.

Main Methods:

First-principles calculations were employed to model the material's behavior.
Analysis of Fermi surfaces and electron-electron interactions was performed.
The role of spin fluctuations and strain engineering was investigated.

Main Results:

The undoped bilayer silicene is intrinsically metallic with significant Fermi pocket surfaces.
Electron-electron interactions drive the system towards a chiral d+id' topological superconductor state.
Strong spin fluctuations near antiferromagnetic spin density wave order mediate superconductivity.

Conclusions:

Bilayer silicene can host a topological superconducting phase.
Strain engineering offers a viable route to tune the superconducting properties.
Achieving high superconducting critical temperatures in bilayer silicene is feasible.