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Coherent backscattering near the two-dimensional metal-insulator transition.
Maryam Rahimi1, S Anissimova, M R Sakr
1Physics Department, Northeastern University, Boston, Massachusetts 02115, USA.
Physical Review Letters
|October 4, 2003
Summary
Corrections to conductivity from coherent backscattering diminish near the metal-insulator transition in silicon. This suggests electron localization is suppressed at the critical density, even without an external magnetic field.
Area of Science:
- Condensed matter physics
- Quantum mechanics
Background:
- Two-dimensional electron systems (2DES) in silicon are crucial for understanding electronic properties.
- The metal-insulator transition (MIT) in disordered systems is a fundamental phenomenon.
- Coherent backscattering (CBS) effects influence conductivity in disordered electronic systems.
Purpose of the Study:
- To investigate conductivity corrections due to CBS in low-disordered 2DES in silicon.
- To examine these corrections across various electron densities, particularly near the MIT.
- To understand the role of spin susceptibility in these phenomena.
Main Methods:
- Studying conductivity in silicon-based 2DES.
- Analyzing data across a range of electron densities.
- Observing phenomena near the metal-insulator transition.
Main Results:
- Conductivity corrections from CBS were observed in the metallic phase.
- These corrections weakened significantly as the electron density approached the critical density.
- The corrections effectively vanished at the critical density.
Conclusions:
- Electron localization appears to be suppressed near and at the metal-insulator transition in zero magnetic field.
- The observed behavior of CBS corrections provides insight into the nature of the MIT.
- Findings contribute to the understanding of electron transport in disordered quantum systems.