scholarly journals Characterising the Metal-Insulator Transition in Two Dimensions

2000 ◽  
Vol 53 (4) ◽  
pp. 531 ◽  
Author(s):  
D. Neilson ◽  
J. S. Thakur ◽  
E. Tosatti
Keyword(s):  
Quantum Tunneling ◽  
Two Dimensions ◽  
Insulator Transition ◽  
Electron Systems ◽  
Electron Correlations ◽  
Metal Insulator Transition ◽  
Metal Insulator ◽  
Potential Barriers ◽  
Electron Density And Temperature ◽  
Good Agreement

We investigate the metal—insulator transition in 2D electron systems assuming a percolation mechanism connecting through a network of metallic domains. The size of the domains is determined by the level of disorder and the strength of the electron correlations. The domains are linked through quantum tunneling. We determine the dependence of the resistivity on electron density and temperature by calculating the tunnelling transmission through the potential barriers between the domains. The results are in good agreement with recent experimental measurements.

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.

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

2019 ◽  
Vol 9 (6) ◽  
pp. 1169 ◽  
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.

scholarly journals A METAL–INSULATOR TRANSITION IN 2D: ESTABLISHED FACTS AND OPEN QUESTIONS

2010 ◽  
Vol 24 (12n13) ◽  
pp. 1640-1663 ◽  
Author(s):  
S. V. Kravchenko ◽  
M. P. Sarachik
Keyword(s):  
Two Dimensions ◽  
Insulator Transition ◽  
Metallic State ◽  
Electron Systems ◽  
Significant Progress ◽  
Metal Insulator Transition ◽  
Metallic Behavior ◽  
Metal Insulator ◽  
Open Questions ◽  
Experimental Findings

The discovery of a metallic state and a metal–insulator transition (MIT) in two-dimensional (2D) electron systems challenges one of the most influential paradigms of modern mesoscopic physics, namely, that "there is no true metallic behavior in two dimensions". However, this conclusion was drawn for systems of noninteracting or weakly interacting carriers, while in all 2D systems exhibiting the metal–insulator transition, the interaction energy greatly exceeds all other energy scales. We review the main experimental findings and show that, although significant progress has been achieved in our understanding of the MIT in 2D, many open questions remain.

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.

QUANTUM CRITICAL BEHAVIOUR IN THE INSULATING REGION OF THE 2D METAL INSULATOR TRANSITION

2006 ◽  
Vol 20 (30n31) ◽  
pp. 5229-5238
Author(s):  
DAVID NEILSON ◽  
D. J. WALLACE GELDART
Keyword(s):  
Critical Region ◽  
Insulator Transition ◽  
Critical Dynamics ◽  
Two Dimensional ◽  
Electron Systems ◽  
Dimensional Electron ◽  
Metal Insulator Transition ◽  
Metal Insulator ◽  
New Information ◽  
Quantum Critical

We show the insulating region of the metal-insulator transition phenomena in disordered two-dimensional electron systems contains new information about the quantum critical dynamics at low T because the insulating region and the quantum critical region are two aspects of the localized phase.

The Behavior of the Spin-One-Half Falicov–Kimball Model Close to the Metal–Insulator Transition

1998 ◽  
Vol 12 (26) ◽  
pp. 2709-2716 ◽  
Author(s):  
Pavol Farkašovský
Keyword(s):  
Experimental Data ◽  
Electrical Conductivity ◽  
Exact Diagonalization ◽  
Two Dimensions ◽  
Insulator Transition ◽  
Rare Earth Compounds ◽  
Qualitative Explanation ◽  
Metal Insulator Transition ◽  
Metal Insulator ◽  
Exhaustive Study

The spin-one-half Falicov–Kimball model for electronically driven valence and metal–insulator transitions is studied in one and two dimensions using small-cluster exact-diagonalization calculations. Performing an exhaustive study of the model close to the metal–insulator transition we have found that the spin-one-half Falicov–Kimball model can describe much of experimental data of transition-metal and rare-earth compounds. Particularly, except the discontinuous transitions it can provide the qualitative explanation for all typical behaviors of the electrical conductivity observed experimentally in these materials.

scholarly journals Possible metal-insulator transition atB=0 in two dimensions

1994 ◽  
Vol 50 (11) ◽  
pp. 8039-8042 ◽  
Author(s):  
S. V. Kravchenko ◽  
G. V. Kravchenko ◽  
J. E. Furneaux ◽  
V. M. Pudalov ◽  
M. D’Iorio
Keyword(s):  
Two Dimensions ◽  
Insulator Transition ◽  
Metal Insulator Transition ◽  
Metal Insulator
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