| EPSRC Reference: |
GR/M46419/01 |
| Title: |
NOISE STUDY NEAR THE METAL TO INSULATOR TRANSITION IN TWO-DIMENSIONAL SEMICONDUCTOR STRUCTURES |
| Principal Investigator: |
Savchenko, Professor A |
| Other Investigators: |
|
| Researcher Co-Investigators: |
|
| Project Partners: |
|
| Department: |
Physics |
| Organisation: |
University of Exeter |
| Scheme: |
Standard Research (Pre-FEC) |
| Starts: |
15 July 1999 |
Ends: |
14 July 2002 |
Value (£): |
212,033
|
| EPSRC Research Topic Classifications: |
|
| EPSRC Industrial Sector Classifications: |
| Electronics |
No relevance to Underpinning Sectors |
|
| Related Grants: |
|
| Panel History: |
|
|
Summary on Grant Application Form |
|
An intriguing behaviour of resistance noise near the Metal to Insulator Transition (MIT) has been seen on thin films and not understood, so there is a need for new experiments on advanced two-dimensional systems where the degree of disorder is varied in a controlled way by changing the carrier concentration. This becomes even more important now, when a new type of the MIT in 2D, with a critical behaviour, has been unexpectedly observed on clean systems with heavy charge carriers. Its origin is unclear, although it is thought to be a result of a strong Coulomb interaction. We propose to perform a comparative study of noise in two-dimensional gases of holes and electrons in GaAs with very different manifestations of the MIT in conductance: with and without critical behaviour. With the help of noise measurements we want to test the suggestion that the insulating regime of p-GaAs is in fact a strongly correlated state - pinned Wigner crystal. In the insulating regime of n-GaAs, we are aimed at understanding the origin of 1/f noise in hopping-unresolved problem, with several theories suggested which we are going to examine by measuring the structures with different geometry.
|
|
Key Findings |
|
This information can now be found on Gateway to Research (GtR) http://gtr.rcuk.ac.uk
|
|
Potential use in non-academic contexts |
|
This information can now be found on Gateway to Research (GtR) http://gtr.rcuk.ac.uk
|
|
Impacts |
|
| Description |
This information can now be found on Gateway to Research (GtR) http://gtr.rcuk.ac.uk |
| Summary |
|
| Date Materialised |
|
|
|
|
Sectors submitted by the Researcher |
|
This information can now be found on Gateway to Research (GtR) http://gtr.rcuk.ac.uk
|
| Project URL: |
|
| Further Information: |
|
| Organisation Website: |
http://www.ex.ac.uk |