The Anderson transition

An outline is given of the electrical properties expected in a disordered solid or fluid which shows a metal-insulator transition of Anderson type. This is one in which the Fermi energy of the electrons passes through a mobility edge separating extended states from states localized by disorder, as the composition or some other parameter is changed. Some of the experimental evidence for this kind of transition is described. In particular, a relatively detailed account is given of the two dimensional inversion layer system in which the relevant parameters may be varied in a single device by direct electrical means.

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PHOTOINDUCED CHARGE CARRIERS IN INSULATING CUPRATES: FERMI GLASS INSULATOR, METAL-INSULATOR TRANSITION AND SUPERCONDUCTIVITY

International Journal of Modern Physics B ◽

10.1142/s0217979293003498 ◽

1993 ◽

Vol 07 (22) ◽

pp. 3751-3815 ◽

Cited By ~ 31

Author(s):

GANG YU ◽

ALAN J. HEEGER

Keyword(s):

Fermi Energy ◽

Spectral Response ◽

Insulator Transition ◽

Metal Insulator Transition ◽

Mobility Edge ◽

Metal Insulator ◽

Time Resolved ◽

Electronic Phase ◽

Glass Insulator ◽

Metallic Droplets

The results of photoexcitation experiments in partially doped, insulating cuprates are reviewed, and the physical implications of these “photodoping” experiments are discussed. The existence of a Fermi-glass insulating state at intermediate doping levels is thoroughly explored. The localized electronic states near the Fermi energy (EF) are characterized through transport, steady-state photoconductivity (including spectral response) and time resolved transient photodoping experiments (sub-nanosecond through microsecond). The experimental results indicate an Anderson-type metal-insulator transition in the doped cuprates; i.e., the transition from metal to insulator is dominated by disorder-induced localization. The Fermi energy can be shifted across the mobility edge either by increasing the doping level or by transient photoexcitation at high pump intensities, thereby causing the metal-insulator transition. The high-Tc superconductors, therefore, can be characterized as disordered metals with the Fermi energy relatively close to the mobility edge (Ec). Although the photo-generated carriers are generated homogeneously, the data indicate electronic phase separation into metallic “droplets”. The temperature dependence of the photoinduced conductivity implies that these droplets become superconducting below the intrinsic transition temperature observed in the heavily doped metallic regime.

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Crystal growth and metal-insulator transition in two-dimensional layered rare-earth palladates

Physical Review Materials ◽

10.1103/physrevmaterials.2.085003 ◽

2018 ◽

Vol 2 (8) ◽

Cited By ~ 2

Author(s):

Yoshiko Nanao ◽

Yoshiharu Krockenberger ◽

Ai Ikeda ◽

Yoshitaka Taniyasu ◽

Michio Naito ◽

...

Keyword(s):

Rare Earth ◽

Crystal Growth ◽

Insulator Transition ◽

Two Dimensional ◽

Metal Insulator Transition ◽

Metal Insulator

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Single-particle scenario of the metal–insulator transition in two-dimensional systems at T=0

Low Temperature Physics ◽

10.1063/1.1542377 ◽

2003 ◽

Vol 29 (1) ◽

pp. 45-54 ◽

Cited By ~ 5

Author(s):

Yu. V. Tarasov

Keyword(s):

Single Particle ◽

Insulator Transition ◽

Two Dimensional ◽

Metal Insulator Transition ◽

Metal Insulator

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EFFECT OF DISORDER ON THE ELECTRICAL PROPERTIES OF AMORPHOUS CONDUCTING CARBON FILMS: OBSERVANCE OF FIELD INDUCED METAL-INSULATOR TRANSITION?

International Journal of Modern Physics B ◽

10.1142/s0217979200000224 ◽

2000 ◽

Vol 14 (02n03) ◽

pp. 224-229 ◽

Cited By ~ 4

Author(s):

V. MEENAKSHI ◽

S. V. SUBRAMANYAM

Keyword(s):

Magnetic Field ◽

Electrical Properties ◽

External Magnetic Field ◽

Low Temperature ◽

Carbon Films ◽

Electronic Systems ◽

Metal Insulator Transition ◽

Preparation Temperature ◽

Metal Insulator ◽

Effect Of Disorder

In this work, the influence of disorder on the electrical properties (DC conductivity and Magnetoresistance) of amorphous conducting carbon films, prepared by the pyrolysis of Tetra chloro phthalic anhydride, is reported and discussed. The low temperature electrical properties are analyzed in terms of the various models developed for disordered electronic systems. The results indicate the possibility of a metal - insulator (M-I) transition, both as a function of preparation temperature and an external magnetic field.

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