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Finite Size Effect in Amorphous Indium oxide
Sreemanta Mitra, Girish C. Tewari, Diana Mahalu +1
We study the low temperature magneto-transport properties of several highly disordered amorphous Indium oxide(a:InO) samples. Simultaneously fabricated devices comprising a 2-dimen…
Two-Dimensional Electron Gas in InGaAs/InAlAs Quantum Wells
E. Diez, Y. P. Chen, S. Avesque +6
We designed and performed low temperature DC transport characterization studies on two-dimensional electron gases confined in lattice-matched InGaAs/InAl…
Symmetries of the Resistance of Mesoscopic Samples in the Quantum Hall Regime
E. Peled, Y. Chen, E. Diez +4
The symmetry properties of the resistance of mesoscopic samples in the quantum Hall regime are investigated. In addition to the reciprocity relation, our samples obey new symmetrie…
Near-Perfect Correlation of the Resistance Components of Mesoscopic Samples at the Quantum Hall Regime
E. Peled, D. Shahar, Y. Chen +3
We study the four-terminal resistance fluctuations of mesoscopic samples near the transition between the and the quantum Hall states. We observe near-perfect correlatio…
The quantized Hall effect in the presence of resistance fluctuations
E. Peled, D. Shahar, Y. Chen +2
We present an experimental study of mesoscopic, two-dimensional electronic systems at high magnetic fields. Our samples, prepared from a low-mobility InGaAs/InAlAs wafer, exhibit r…
Phase diagram of the integer quantum Hall effect in p-type Germanium
M. Hilke, D. Shahar, S. H. Song +2
We experimentally study the phase diagram of the integer quantized Hall effect, as a function of density and magnetic field. We used a two dimensional hole system confined in a Ge/…
Semicircle: An exact relation in the Integer and Fractional Quantum Hall Effect
M. Hilke, D. Shahar, S. H. Song +3
We present experimental results on the quantized Hall insulator in two dimensions. This insulator, with vanishing conductivities, is characterized by the quantization (within exper…
The Quantized Hall Insulator: A New Insulator in Two-Dimensions
M. Hilke, D. Shahar, S. H. Song +3
Quite generally, an insulator is theoretically defined by a vanishing conductivity tensor at the absolute zero of temperature. In classical insulators, such as band insulators, van…
Microwave Resonance and Carrier-Carrier Interaction in Two-Dimensional Hole Systems at High Magnetic Field
C. -C. Li, J. Yoon, L. W. Engel +3
Microwave frequency conductivity, Re(), of high quality two-dimensional hole systems (2DHS) in a large perpendicular magnetic field (B) is measured with the carrier density…
Observation of the Metal-Insulator Transition in Two-Dimensional n-type GaAs
Y. Hanein, D. Shahar, J. Yoon +3
The observation of a carrier-density driven metal-insulator transition in n-type GaAs-based heterostructure is reported. Although weaker than in comparable-quality p-type GaAs samp…
Universality at integer quantum Hall transitions
Kun Yang, D. Shahar, R. N. Bhatt +2
We report in this paper results of experimental and theoretical studies of transitions between different integer quantum Hall phases, as well as transition between the insulating p…
Novel Properties of The Apparent Metal-Insulator Transition in Two-Dimensional Systems
Y. Hanein, D. Shahar, J. Yoon +3
The low-temperature conductivity of low-density, high-mobility, two-dimensional hole systems in GaAs was studied. We explicitly show that the metal-insulator transition, observed i…
The Metallic-Like Conductivity of a Two-Dimensional Hole System
Y. Hanein, U. Meirav, D. Shahar +3
We report on a zero magnetic field transport study of a two-dimensional, variable-density, hole system in GaAs. As the density is varied we observe, for the first time in GaAs-base…
Symmetry in the insulator - quantum Hall - insulator transitions observed in a Ge/SiGe quantum well
M. Hilke, D. Shahar, S. H. Song +3
We examine the magnetic field driven insulator-quantum Hall-insulator transitions of the two dimensional hole gas in a Ge/SiGe quantum well. We observe direct transitions between l…
A New Transport Regime in the Quantum Hall Effect
D. Shahar, M. Hilke, C. C. Li +3
This paper describes an experimental identification and characterization of a new low temperature transport regime near the quantum Hall-to-insulator transition. In this regime, a…
A different view of the quantum Hall plateau-to-plateau transitions
D. Shahar, D. C. Tsui, M. Shayegan +2
We demonstrate experimentally that the transitions between adjacent integer quantum Hall (QH) states are equivalent to a QH-to-insulator transition occurring in the top Landau leve…
Duality Near Quantum Hall Transitions
E. Shimshoni, S. L. Sondhi, D. Shahar
A recent experiment by Shahar et al, on the phase transitions between quantum Hall states and the insulator, found that the current-voltage characteristics in the two phases are re…