Reentrant Insulator-Metal-Insulator Transition at<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi mathvariant="italic">B</mml:mi><mml:mspace /><mml:mo>=</mml:mo><mml:mspace /><mml:mn>0</mml:mn><mml:mn /></mml:math>in a Two-Dimensional Hole Gas

Hamilton, A. R.; Simmons, M. Y.; Pepper, M.; Linfield, Edmund H.; Rose, P. D.; Ritchie, D. A.

doi:10.1103/physrevlett.82.1542

Cited by 71 publications

(68 citation statements)

References 12 publications

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“…Data for n n c is shown in Fig. 77 and agrees quite well with the theoretical curves as shown; similar results for n close to n c are also reported [119]. More recent low-temperature data in GaAs heterostructures [184] is reproduced in Fig.…”

Section: Experiments In a Perpendicular ÿEldsupporting

confidence: 78%

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Singular or non-Fermi liquids

2002

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Section: Experiments In a Perpendicular ÿEldsupporting

confidence: 78%

“…71-73 is for Si-MOSFET samples. The data for GaAs heterostructures, and Si in other geometries is qualitatively similar [120,62,63,210,119,184]. Fig.…”

Section: Methodssupporting

confidence: 66%

Singular or non-Fermi liquids

2002

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“…Firstly, the large values of the persistent current measured in metallic mesoscopic rings [2,3,4] cannot be accounted by the theoretical predictions based on the single electron picture [5], nor by perturbative approaches taking into account (to infinite order) the effect of electron-electron interactions [6,7]. Secondly, the discovery of a metallic behavior in two-dimensional gases of electrons (Si-MOSFET [8]) or holes (GaAs heterostructures [9] and SiGe quantum wells [10]) is at odds with the conclusions of non-interacting theories that predict an insulating behavior for any value of the disorder strength [11]. For a recent review on the metal-insulator transition in 2D electron and hole gases see Ref.…”

Section: Introductionmentioning

confidence: 99%

Delocalization effects and charge reorganizations induced by repulsive interactions in strongly disordered chains

Weinmann

Schmitteckert²,

Jalabert³

et al. 2001

Eur. Phys. J. B

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Abstract. We study the delocalization effect of a short-range repulsive interaction on the ground state of a finite density of spinless fermions in strongly disordered one dimensional lattices. The density matrix renormalization group method is used to explore the charge density and the sensitivity of the ground state energy with respect to the boundary condition (the persistent current) for a wide range of parameters (carrier density, interaction and disorder). Analytical approaches are developed and allow to understand some mechanisms and limiting conditions. For weak interaction strength, one has a Fermi glass of Anderson localized states, while in the opposite limit of strong interaction, one has a correlated array of charges (Mott insulator). In the two cases, the system is strongly insulating and the ground state energy is essentially invariant under a twist of the boundary conditions. Reducing the interaction strength from large to intermediate values, the quantum melting of the solid array gives rise to a more homogeneous distribution of charges, and the ground state energy changes when the boundary conditions are twisted. In individual chains, this melting occurs by abrupt steps located at sample-dependent values of the interaction where an (avoided) level crossing between the ground state and the first excitation can be observed. Important charge reorganizations take place at the avoided crossings and the persistent currents are strongly enhanced around the corresponding interaction value. These large delocalization effects become smeared and reduced after ensemble averaging. They mainly characterize half filling and strong disorder, but they persist away of this optimal condition. PACS. 72.15.-v Electronic conduction in metals and alloy -73.20.Dx Electron states in low-dimensional structures -72.10.Bg General formulation of transport theory -05.60.Gg Quantum transport

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“…Erst bei sehr großer Dichte wird in solchen Systemen wieder isolierendes Verhalten gefunden [2]. Die Existenz einer metallischen Phase in zwei Dimensionen erregt Aufmerksamkeit, weil man noch bis vor kurzem glaubte, dass alle zweidimensionalen Systeme, jedenfalls solange kein externes Magnetfeld anliegt, auch bei noch so schwacher Unordnung Isolatoren seien.…”

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Mesoskopische Systeme mit Wechselwirkung und Unordnung: Erhöht die Coulomb‐Wechselwirkung die Leitfähigkeit ungeordneter Festkörper?

Weinmann

2000

Phys. Bl.

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Kürzlich wurde metallisches Verhalten in zweidimensionalen Elektronensystemen mit geringer Störstellenkonzentration gemessen. Dies war überraschend, weil die Theorie vorhergesagt hatte, dass solche Systeme generell Isolatoren sein sollten, und das selbst bei noch so geringer – aber in allen Proben vorhandener – Störstellenkonzentration. Zum Verständnis der Experimente müssen neuartige theoretische Zugänge entwickelt werden.

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Reentrant Insulator-Metal-Insulator Transition atB=0in a Two-Dimensional Hole Gas

Cited by 71 publications

References 12 publications

Singular or non-Fermi liquids

Singular or non-Fermi liquids

Delocalization effects and charge reorganizations induced by repulsive interactions in strongly disordered chains

Mesoskopische Systeme mit Wechselwirkung und Unordnung: Erhöht die Coulomb‐Wechselwirkung die Leitfähigkeit ungeordneter Festkörper?

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