54 citations · 260 across the 15 of their papers we have counts for
7 papers · 1 filter
Quantum Lifetime in Ultra-High Quality GaAs Quantum Wells: Relationship to and Impact of Density Fluctuations
Qi Qian, James R. Nakamura, Saeed Fallahi +6
We consider quantum lifetime derived from low-field Shubnikov-de Haas oscillations as a metric of quality of the two-dimensional electron gas in GaAs quantum wells that expresses l…
New topological excitations and melting transitions in quantum Hall systems
Tzu-ging Lin, George Simion, John D. Watson +4
We discover a new topological excitation of two dimensional electrons in the quantum Hall regime. The strain dependence of resistivity is shown to change sign upon crossing filling…
Negative Differential Resistance and Astability of the Wigner Solid
G. A. Csathy, D. C. Tsui, L. N. Pfeiffer +1
We report an unusual breakdown of the magnetically induced Wigner solid in an exceptional two-dimensional electron gas. The current-voltage characteristic is found to be hysteretic…
Tilt Induced Localization and Delocalization in the Second Landau Level
G. A. Csathy, J. S. Xia, C. L. Vicente +6
We have investigated the behavior of electronic phases of the second Landau level under tilted magnetic fields. The fractional quantum Hall liquids at 2+1/5 and 2+4/5 and the s…
Transition from a fractional quantum Hall liquid to an electron solid at Landau level filling nu = 1/3 in tilted magnetic fields
W. Pan, G. A. Csathy, D. C. Tsui +2
We have observed in a low density two-dimensional hole system (2DHS) of extremely high quality (with hole density p=1.6x10^{10} cm^{-2} and mobility μ=0.8x10^6 cm^2/Vs) that, as th…
Magnetic Field Induced Insulating Phases at Large
G. A. Csáthy, Hwayong Noh, D. C. Tsui +2
Exploring a backgated low density two-dimensional hole sample in the large regime we found a surprisingly rich phase diagram. At the highest densities, beside the , 2/…