Related Experiment Video
Updated: Jul 19, 2026
15:58
Measurement of Coherence Decay in GaMnAs Using Femtosecond Four-wave Mixing
Published on: December 3, 2013
Dephasing in (Ga,Mn)As nanowires and rings
K Wagner1, D Neumaier, M Reinwald
1Institut für Experimentelle und Angewandte Physik, Universität Regensburg, Regensburg, Germany. konrad.wagner@physik.uni-regensburg.de
Physical Review Letters
|October 10, 2006
Summary
Researchers observed universal conductance fluctuations in ferromagnetic (Ga,Mn)As, a key quantum phenomenon. This finding provides insights into the dephasing mechanisms and phase coherence length in these materials.
Area of Science:
- Condensed Matter Physics
- Quantum Mechanics
- Materials Science
Background:
- Understanding quantum mechanical transport in ferromagnetic semiconductors requires knowledge of phase coherence length and dephasing mechanisms.
- Experimental access to these quantities has been limited due to the lack of observable quantum phenomena.
Purpose of the Study:
- To investigate quantum mechanical transport in ferromagnetic semiconductors.
- To experimentally determine the phase coherence length and dephasing mechanisms in ferromagnetic (Ga,Mn)As.
Main Methods:
- Observation of universal conductance fluctuations in ferromagnetic (Ga,Mn)As.
- Analysis of the length and temperature dependence of these fluctuations.
Main Results:
- Universal conductance fluctuations were observed in ferromagnetic (Ga,Mn)As.
- The dephasing time was found to exhibit a T(-1) dependence, where T is temperature.
Conclusions:
- The study provides experimental access to quantum transport properties in ferromagnetic semiconductors.
- The observed T(-1) dependence of dephasing time offers crucial insights into the dephasing mechanisms in (Ga,Mn)As.
