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Aging effects across the metal-insulator transition in two dimensions
J Jaroszyński1, Dragana Popović
1National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, USA.
Physical Review Letters
|February 1, 2008
Summary
Aging effects in silicon
Area of Science:
- Condensed matter physics
- Materials science
Background:
- Investigating aging phenomena in two-dimensional electron systems (2DES) is crucial for understanding complex electronic behaviors.
- The metal-insulator transition (MIT) in 2DES presents a unique regime for studying glassy dynamics.
Purpose of the Study:
- To examine aging effects in conductivity relaxations of 2DES in silicon.
- To characterize the behavior of the glassy phase around the MIT as a function of carrier density.
Main Methods:
- Studied aging effects in conductivity relaxations.
- Analyzed the impact of carrier density on the glassy phase dynamics.
- Investigated relaxation amplitudes and noise characteristics.
Main Results:
- Observed full aging in the insulating regime, with deviations on the metallic side of the MIT.
- Found that the amplitude of relaxations peaks near the MIT and is suppressed in the insulating phase.
- Noted significant departures from full aging in the metallic regime before the glassy phase disappears.
Conclusions:
- The nature of the glassy phase changes abruptly at the metal-insulator transition.
- Aging dynamics are strongly influenced by carrier density and proximity to the MIT.
- The findings suggest similarities between 2DES aging and spin glass behavior.
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