5 papers
Vertical Graphene Base Transistor
Wolfgang Mehr, J. Christoph Scheytt, Jarek Dabrowski +5
We present a novel, graphene-based device concept for high-frequency operation: a hot electron graphene base transistor (GBT). Simulations show that GBTs have high current on/off r…
Termination of two-dimensional metallic conduction near metal-insulator transition in a Si/SiGe quantum well
T. M. Lu, W. Pan, D. C. Tsui +3
We report in this Letter our recent low temperature transport results in a Si/SiGe quantum well with moderate peak mobility. An apparent metal-insulating transition is observed. Wi…
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…
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…