scholarly journals Metallic phase in a two-dimensional disordered Fermi system with singular interactions

2005 ◽  
Vol 72 (21) ◽  
Author(s):  
Victor M. Galitski
Keyword(s):  
Fermi System ◽  
Metallic Phase ◽  
Two Dimensional ◽  
Singular Interactions

scholarly journals Robust anomalous metallic states and vestiges of self-duality in two-dimensional granular In-InOx composites

2021 ◽  
Vol 6 (1) ◽  
Author(s):  
Xinyang Zhang ◽  
Bar Hen ◽  
Alexander Palevski ◽  
Aharon Kapitulnik
Keyword(s):  
Magnetic Field ◽  
Metallic Phase ◽  
Broadband Noise ◽  
Two Dimensional ◽  
Conventional Theory ◽  
Logarithmic Divergence ◽  
Self Duality ◽  
Low Field ◽  
Wide Range ◽  
Low Temperature Resistance

AbstractMany experiments investigating magnetic-field tuned superconductor-insulator transition (H-SIT) often exhibit low-temperature resistance saturation, which is interpreted as an anomalous metallic phase emerging from a ‘failed superconductor’, thus challenging conventional theory. Here we study a random granular array of indium islands grown on a gateable layer of indium-oxide. By tuning the intergrain couplings, we reveal a wide range of magnetic fields where resistance saturation is observed, under conditions of careful electromagnetic filtering and within a wide range of linear response. Exposure to external broadband noise or microwave radiation is shown to strengthen the tendency of superconductivity, where at low field a global superconducting phase is restored. Increasing magnetic field unveils an ‘avoided H-SIT’ that exhibits granularity-induced logarithmic divergence of the resistance/conductance above/below that transition, pointing to possible vestiges of the original emergent duality observed in a true H-SIT. We conclude that anomalous metallic phase is intimately associated with inherent inhomogeneities, exhibiting robust behavior at attainable temperatures for strongly granular two-dimensional systems.

scholarly journals Calculation of the Exchange Constant in 2D Wigner Liquid

1999 ◽  
Vol 52 (5) ◽  
pp. 845
Author(s):  
V. V. Flambaum ◽  
I. V. Ponomarev ◽  
O. P. Sushkov
Keyword(s):  
Magnetic Order ◽  
Recent Observation ◽  
Metallic Phase ◽  
Range Order ◽  
Spin Interaction ◽  
Exchange Constant ◽  
Two Dimensional ◽  
Metal Insulator ◽  
Theoretical Question ◽  
Antiferromagnetic Spin

The recent observation of a two-dimensional (2D) metal–insulator transition in semiconductor devices and the strong influence of a magnetic field on the metallic phase has attracted a great deal of interest. This gives rise to the important theoretical question about the nature and the magnetic order of insulating and conducting phases. In the present paper we calculate (both analytically and numerically) the exchange constant for a two-dimensional Wigner liquid— the state with destroyed long-range order but preserved short-range order. It is demonstrated that there is an antiferromagnetic spin–spin interaction between nearest electrons. We also discuss a possible pairing of the electrons in a 2D Wigner crystal by the spin-Peierls mechanism.

Localized electrons in the metallic phase of the two-dimensional electron system at (Al,Ga)As-GaAs heterojunctions

1997 ◽  
Vol 55 (12) ◽  
pp. R7339-R7342 ◽  
Author(s):  
V. T. Dolgopolov ◽  
A. A. Shashkin ◽  
M. Wendel ◽  
J. P. Kotthaus ◽  
L. W. Molenkamp ◽  
...  
Keyword(s):  
Electron System ◽  
Metallic Phase ◽  
Two Dimensional ◽  
Dimensional Electron ◽  
Dimensional Electron System ◽  
Localized Electrons

scholarly journals Instability of the two-dimensional metallic phase to a parallel magnetic field

JETP Letters ◽  
1997 ◽  
Vol 65 (12) ◽  
pp. 932-937 ◽  
Author(s):  
V. M. Pudalov ◽  
G. Brunthaler ◽  
A. Prinz ◽  
G. Bauer
Keyword(s):  
Magnetic Field ◽  
Metallic Phase ◽  
Two Dimensional ◽  
Parallel Magnetic Field

TWO-DIMENSIONAL LOCALIZATION: SYNTHESIS OF OLD AND NEW RESULTS

2003 ◽  
Vol 17 (25) ◽  
pp. 4491-4507 ◽  
Author(s):  
VIPIN SRIVASTAVA ◽  
RAISHMA KRISHNAN
Keyword(s):  
Electron Density ◽  
Disordered Systems ◽  
Metallic Phase ◽  
Experimental Results ◽  
Two Dimensional ◽  
Central Question ◽  
Electron Densities ◽  
Insulating Phase

We have addressed the central question in two-dimensional disordered systems: whether all states are localized even at infinitesimal disorder, as has been believed for over two decades but has come in question after recent experiments. We argue that the answer could still be yes since above a certain density the electrons can be treated effectively as non-interacting. Below this density, though the interactions among electrons get weaker they become more and more important as the electron density reduces. This can cause delocalization and produce a metallic phase. Some recent experimental results have been analysed to understand the nature of the newly found metallic phase at low electron-densities, and also the insulating phase at lower densities.

scholarly journals Recent Progress in Two-Dimensional MoTe2 Hetero-Phase Homojunctions

Nanomaterials ◽  
2021 ◽  
Vol 12 (1) ◽  
pp. 110
Author(s):  
Jing Guo ◽  
Kai Liu
Keyword(s):  
High Performance ◽  
Recent Progress ◽  
Field Effect Transistors ◽  
Metallic Phase ◽  
Research Field ◽  
Two Dimensional ◽  
Small Energy ◽  
Potential Applications ◽  
Clean Interface ◽  
Two Phases

With the demand for low contact resistance and a clean interface in high-performance field-effect transistors, two-dimensional (2D) hetero-phase homojunctions, which comprise a semiconducting phase of a material as the channel and a metallic phase of the material as electrodes, have attracted growing attention in recent years. In particular, MoTe2 exhibits intriguing properties and its phase is easily altered from semiconducting 2H to metallic 1T′ and vice versa, owing to the extremely small energy barrier between these two phases. MoTe2 thus finds potential applications in electronics as a representative 2D material with multiple phases. In this review, we briefly summarize recent progress in 2D MoTe2 hetero-phase homojunctions. We first introduce the properties of the diverse phases of MoTe2, demonstrate the approaches to the construction of 2D MoTe2 hetero-phase homojunctions, and then show the applications of the homojunctions. Lastly, we discuss the prospects and challenges in this research field.

scholarly journals Long-lived trimers in a quasi-two-dimensional Fermi system

2018 ◽  
Vol 97 (4) ◽  
Author(s):  
Emma K. Laird ◽  
Thomas Kirk ◽  
Meera M. Parish ◽  
Jesper Levinsen
Keyword(s):  
Fermi System ◽  
Two Dimensional

scholarly journals Magnetic-field-induced Metallic Phase at Low Temperature in Two-dimensional Superconductors

2015 ◽  
Vol 65 ◽  
pp. 101-104
Author(s):  
E. Murakami ◽  
A. Ochi ◽  
Y. Kawamura ◽  
S. Kaneko ◽  
S. Okuma
Keyword(s):  
Magnetic Field ◽  
Low Temperature ◽  
Metallic Phase ◽  
Two Dimensional
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