arXiv subjects

J. L. Reno

Publications and source records attributed to J. L. Reno.

38 records · Page 3Linked to original sources

arXiv1999

Magnetic Field Induced Charged Exciton Studies in a GaAs/Al(0.3)Ga(0.7)As Single Heterojunction

The magnetophotoluminescence (MPL) behavior of a GaAs/Al(0.3)Ga(0.7)As single heterojunction has been investigated to 60T. We observed negatively charged singlet and triplet exciton states that are formed at high magnetic fields beyond the nu=1 quantum Hall state. The variation of the charged exciton binding energies are in good agreement with theoretical predictions. The MPL transition intensities for these states showed intensity variations (maxima and minima) at the nu=1/3 and 1/5 fractional quantum Hall (FQH) state as a consequence of a large reduction of electron-hole screening at these filling factors.

cond-mat.mes-hall↗

arXiv1997

Microwave Photoresistance Measurements of Magneto-excitations near a 2D Fermi Surface

We report the detection of the cyclotron(CR) and magneto-plasmon(MPR) resonances near the Fermi surface of high-mobility 2DES, by microwave photoresistance measurements. We observe large amplitude photoresistance oscillations originating from higher-order CR, transitions between non-adjacent Landau levels. Such transitions are drastically enhanced in low magnetic field as compared to those previously known in the high field limit. The scattering time of the CR is found to be nearly one order of magnitude higher than that of Shubnikov-de-Haas oscillations. Finally, distinct photoresistance peaks are observed in addition to the CR features. These are identified as resonances of the low-frequency MP modes at a cut-off wavelength determined by the width of the 2DES sample.

cond-mat.str-el↗