Observation of an Even-Odd Asymmetric Transport in High Landau Levels

Magnetotransport experiments including tilt fields are performed on ultrahigh mobility L-shaped Hall-bar samples of GaAs/AlGaAs quantum wells. The low-temperature longitudinal resistivity (rho(xx)) data demonstrate that a striking even-odd asymmetric transport exists along the [1 (1) over bar0] direction at half filling in N >= 2 high Landau levels. Although the origin for the peculiar even-odd asymmetry remains unclear, we propose that the coupling strength between electrons within the same Landau level and between the neighboring two Landau levels should be considered in future studies. The tilt field data show that the in-plane field can suppress the formation of both bubble and stripe phases.National Basic Research Program of China [2014CB920904, 2013CB921702]; National Natural Science Foundation of China [11174340, 11174357, 91221203, 91421303]; Strategic Priority Research Program B of the Chinese Academy of Sciences [XDB07010100]; Gordon and Betty Moore Foundation through the EPiQS initiative [GBMF4420]; National Science Foundation of MRSEC [DMR-1420541]SCI(E)ARTICLE33