Hopping in a low-mobility GaAs-AlGaAs heterojunction in the limit of low electronic concentrations
- 3 September 1990
- journal article
- design note
- Published by IOP Publishing in Journal of Physics: Condensed Matter
- Vol. 2 (35) , 7367-7371
- https://doi.org/10.1088/0953-8984/2/35/013
Abstract
A gated low-mobility GaAs-Al0.3Ga0.7As delta-doped heterojunction of large area is used to demonstrate a transition from diffusive to hopping transport as the electron concentration in the two-dimensional conducting layer is reduced. At helium temperatures (1.30 exp-(T0/T)1/2 expected when electron-electron interactions are strong. At very low temperatures (T approximately=100 mK), conductance fluctuations are seen, indicating that under these conditions size effects are important and a description of transport by a macroscopic model of conduction is inappropriate.Keywords
This publication has 17 references indexed in Scilit:
- Activationless hopping of correlated electrons inn-type GaAsPhysical Review B, 1989
- Threshold transport of high-mobility two-dimensional electron gas in GaAs/AlGaAs heterostructuresApplied Physics Letters, 1988
- Magnetic-field-induced metal-nonmetal transition in GaAs-As heterostructuresPhysical Review B, 1986
- Quantum corrections and the metal-insulator transition as a function of dimensionality in the GaAs impurity bandPhilosophical Magazine Part B, 1985
- Fermi-liquid theory of the electron-electron interaction effects in disordered metalsSolid State Communications, 1983
- Hopping conduction in the Landau level tails in GaAs-AlxGa1-xAs heterostructures at low temperaturesSolid State Communications, 1983
- Zero resistance state and origin of the quantized Hall effect in two-dimensional electron systemsSurface Science, 1982
- The Anderson transitionProceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences, 1975
- Coulomb gap and low temperature conductivity of disordered systemsJournal of Physics C: Solid State Physics, 1975
- Conduction in glasses containing transition metal ionsJournal of Non-Crystalline Solids, 1968