Temperature dependence of conductance fluctuations in quantum Hall multilayers

H. A. Walling, E. G. Gwinn, J. Xu, K. D. Maranowski, A. C. Gossard
2004 Physical Review B  
We study conductance fluctuations in low-temperature, vertical transport through quantum Hall multilayers. The mesas studied are fabricated from a 50-period multilayer in which 150 Å GaAs wells alternate with 150 Å AlGaAs barriers that are delta-doped at their centers. We find qualitatively different temperature dependences of the variance, ␦G 2 , measured near the centers of the = 2 and = 1 quantum Hall states, with non-monotonic variation in ␦G 2 ͑T͒ at = 1. The observed temperature
more » ... mperature dependence of the correlation field is also surprising in light of theoretical predictions for fluctuations of the edge state sheath. Including the temperature dependence of the mean conductance and the effects of flux cancellation improves agreement between observed and predicted temperature dependences.
doi:10.1103/physrevb.70.235343 fatcat:k33mujypfzcplhegkv2jhcic2a