Magnetotransport anomalies in dilute two-dimensional electron systems: An experiment and a model
UNSPECIFIED (1996) Magnetotransport anomalies in dilute two-dimensional electron systems: An experiment and a model. In: 11th International Conference on the Electronic Properties of 2-Dimensional Systems (EP2DS XI), UNIV NOTTINGHAM, NOTTINGHAM, ENGLAND, AUG 07-11, 1995. Published in: Surface Science, 362 (1-3). pp. 933-936.Full text not available from this repository.
Magnetotransport characteristics of dilute two-dimensional hole gases (2DHGs) in Si/SiGe heterostructures are shown to have two types of anomalous behaviour. (1) With increasing magnetic field, the normal sequence of quantum Hall effect states is interrupted by the appearance of the insulating state in the region of filling factor two, which in turn is replaced by the i=1 quantum Hall effect state. Tilting the sample plane relative to the magnetic field direction increases dramatically the degree of insulating behaviour. (2) In a similar heterostructure, but with a higher areal density of holes, the insulating state is not observed. However the measured, almost quantised, value of the Hall conductivity turns out So be different from that expected from the shubnikov-de Haas oscillation periodicity. A new model which describes quantum transport in terms of percolation phenomena, predicting a nonmonotonic dependence of Hall conductivity on magnetic field, is shown to be capable of explaining the data.
|Item Type:||Conference Item (UNSPECIFIED)|
|Subjects:||Q Science > QD Chemistry
Q Science > QC Physics
|Journal or Publication Title:||Surface Science|
|Publisher:||ELSEVIER SCIENCE BV|
|Number of Pages:||4|
|Page Range:||pp. 933-936|
|Title of Event:||11th International Conference on the Electronic Properties of 2-Dimensional Systems (EP2DS XI)|
|Location of Event:||UNIV NOTTINGHAM, NOTTINGHAM, ENGLAND|
|Date(s) of Event:||AUG 07-11, 1995|
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