Potential fluctuations in heterostructure devices
- 15 April 1990
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 41 (11) , 7929-7932
- https://doi.org/10.1103/physrevb.41.7929
Abstract
The random positions of ionized-impurity ions in doped heterostructures give rise to a random potential, which we have analyzed using a self-consistent method that includes nonlinear screening. A two-dimensional electron gas becomes highly inhomogeneous as its average density is lowered, eventually breaking into isolated puddles and undergoing a classical metal-insulator transition. A quantum wire formed by split gates is strongly distorted by the random potential, impeding ballistic propagation. The wire becomes discontinuous before it is narrow enough to support monomode propagation.Keywords
This publication has 19 references indexed in Scilit:
- Optimisation of (Al,Ga)As/GaAs two-dimensional electron gas structures for low carrier densities and ultrahigh mobilities at low temperaturesSemiconductor Science and Technology, 1989
- Fluctuations in submicrometer semiconducting devices caused by the random positions of dopantsPhysical Review B, 1989
- Non-linear screening and the background density of 2DEG states in magnetic fieldSolid State Communications, 1988
- One-dimensional transport and the quantisation of the ballistic resistanceJournal of Physics C: Solid State Physics, 1988
- Quantized conductance of point contacts in a two-dimensional electron gasPhysical Review Letters, 1988
- Localisation effects caused by the remote donors in modulation-doped quantum wellsSemiconductor Science and Technology, 1988
- Barrier height fluctuations in very small devices due to the discreteness of the dopantsJournal of Applied Physics, 1987
- Resistance fluctuations in ohmic contacts due to discreteness of dopantsApplied Physics Letters, 1986
- Electronic Properties of Doped SemiconductorsPublished by Springer Nature ,1984
- Electronic properties of two-dimensional systemsReviews of Modern Physics, 1982