We have developed a model of the high-current breakdown of the integer quantum Hall effect, as measured in contactless experiments using a highly-sensitive torsion balance magnetometer. The model predicts that, for empirically “low-mobility” samples sm,75 m2 V−1 s−1d, the critical current for breakdown should decrease with, and have a linear dependence on, temperature. This prediction is verifi...

We report on the magnetotransport measurement on a single-layer graphene in pulsed magnetic fields up to B = 53 T. With either electronor hole-type charge carriers, the Hall resistance RH is quantized into RH = (h/e )ν with ν = ±2, ±6, and ±10, which demonstrates the observation of a half-integer quantum Hall effect (QHE). At B = 50 T, the half-integer QHE is even observed at room temperature i...

We show that at zero temperature the Coulomb drag between two layers of Landau level filling factor ν = 1/2 is finite in the incompressible paired quantum Hall liquid limit. The temperature dependence of the Coulomb drag exhibits a minimum near the temperature where the transition between the incompressible double layer quantum Hall liquid state and the weakly coupled compressible state takes p...

The thermally activated behavior of the gate defined narrow Hall bars is studied by analyzing the existence of the incompressible strips within a Hartree-type approximation. We perform self-consistent calculations considering the linear response regime, supported by a local conductivity model. We investigate the variation of the activation energy depending on the width of samples in the range o...

Damped Doppler shift oscillations have been observed in emission lines from ions formed at flare temperatures with the Solar Ultraviolet Measurements of Emitted Radiation spectrometer on the Solar and Heliospheric Observatory and with the Bragg Crystal Spectrometer on Yohkoh. This Letter reports the detection of low-amplitude damped oscillations in coronal emission lines formed at much lower te...