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Microwave-induced dephasing in one-dimensional metal wires
J Wei1, S Pereverzev, M E Gershenson
1Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854, USA.
Physical Review Letters
|April 12, 2006
Summary
Monochromatic microwave radiation affects conductivity in silver wires by influencing electron dephasing. This study confirms theoretical predictions and suggests low-power microwave noise can impact dephasing time in low-temperature experiments.
Area of Science:
- Condensed Matter Physics
- Quantum Transport Phenomena
- Low-Dimensional Systems
Background:
- Weak localization (WL) corrections significantly influence the conductivity of quasi-one-dimensional (1D) systems.
- Electron cooling in narrow wires can mitigate overheating effects during electromagnetic radiation experiments.
- Understanding dephasing mechanisms is crucial for controlling electron transport in nanoscale devices.
Purpose of the Study:
- To investigate the impact of monochromatic microwave (MW) radiation on weak-localization corrections in quasi-1D silver wires.
- To examine the relationship between MW power, frequency, and MW-induced dephasing.
- To validate theoretical models describing electron dephasing in confined systems.
Main Methods:
- Experimental application of monochromatic microwave radiation to quasi-1D silver wires.
- Measurement of conductivity changes under varying microwave power (P(MW)) and frequency (f).
- Analysis of electron cooling effects and dephasing rates in response to MW exposure.
Main Results:
- MW radiation was observed to induce dephasing in silver wires without significant electron overheating.
- The observed dependencies of conductivity and dephasing rate on P(MW) and f align with theoretical predictions.
- The study identified a potential cause for the saturation of dephasing time temperature dependence.
Conclusions:
- Monochromatic MW radiation effectively influences weak-localization effects in quasi-1D silver wires.
- Experimental findings support the theoretical framework by Altshuler, Aronov, and Khmelnitsky.
- Low-power (sub-pW) MW electromagnetic noise may be responsible for dephasing time saturation in low-temperature 1D wire experiments.
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