scholarly journals Review on quasi-2D square planar nickelates

CrystEngComm ◽  
2021 ◽  
Author(s):  
Junjie Zhang ◽  
Xutang Tao
Keyword(s):  
Physical Properties ◽  
Degrees Of Freedom ◽  
Insulator Transition ◽  
Strongly Correlated ◽  
Metal Insulator Transition ◽  
Metal Insulator ◽  
Strongly Correlated Materials ◽  
Square Planar ◽  
Magnetic Resistance

In strongly correlated materials, lattice, charge, spin and orbital degrees of freedom interact with each other, leading to emergent physical properties such as superconductivity, colossal magnetic resistance and metal-insulator transition....

scholarly journals Identification of a monoclinic metallic state in VO2 from a modified first-principles approach

2019 ◽  
Vol 33 (12) ◽  
pp. 1950148
Author(s):  
Yongcheng Liang ◽  
Ping Qin ◽  
Zhiyong Liang ◽  
Lizhen Zhang ◽  
Xun Yuan ◽  
...  
Keyword(s):  
First Principles ◽  
Lattice Distortion ◽  
Insulator Transition ◽  
Metallic State ◽  
Strongly Correlated ◽  
Electron Systems ◽  
First Principles Calculations ◽  
Monoclinic Structure ◽  
Metal Insulator Transition ◽  
Metal Insulator

Metal-insulator transition (MIT) underlies many remarkable and technologically important phenomena in VO2. Even though its monoclinic structure had before been the reserve of the insulating state, recent experiments have observed an unexpected monoclinic metallic state. Here, we use a modified approach combining first-principles calculations with orbital-biased potentials to reproduce the correct stability ordering and electronic structures of different phases of VO2. We identify a ferromagnetic monoclinic metal that is likely to be the experimentally observed mysterious metastable state. Furthermore, the calculations show that an isostructural insulator-metal electronic transition is followed by the lattice distortion from the monoclinic structure to the rutile one. These results not only explain the experimental observations of the monoclinic metallic state and the decoupled structural and electronic transitions of VO2, but also provide a useful understanding for the metal-insulator transition in other strongly correlated d electron systems.

scholarly journals Recent Developments in the Field of the Metal-Insulator Transition in Two Dimensions

2019 ◽  
Author(s):  
Alexander Shashkin ◽  
Sergey Kravchenko
Keyword(s):  
Two Dimensions ◽  
Insulator Transition ◽  
Strongly Correlated ◽  
Electron Systems ◽  
Dimensional Electron ◽  
Metal Insulator Transition ◽  
Metal Insulator ◽  
Quantum Electron ◽  
Recent Developments ◽  
Silicon Based

We review the latest developments in the field of the metal-insulator transition in strongly-correlated two-dimensional electron systems. Particular attention is given to recent discoveries of a sliding quantum electron solid and interaction-induced spectrum flattening at the Fermi level in high-quality silicon-based structures.

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