CPM Seminar
Electron-electron interactions mediated by magnetic
impurities
Anne Anthore
Quantronics group
CEA Saclay
Quantum coherence effects in electronic transport are limited by the
finite phase coherence time of electrons. At sub-Kelvin temperatures,
Coulomb electron-electron interactions are expected to determine
Τφ, and energy exchanges between electrons.
Previous spectroscopic measurements of energy exchanges proved that
another interaction process dominates in most of cases. Theoretically, a
new mechanism in which energy exchanges are mediated by Kondo magnetic
impurities has been proposed to explain these results. The presence of a
small amount of magnetic impurities could furthermore explain the
long-standing issue of the saturation of Τφ observed at low
temperature in many experiments.
We have performed measurements of energy exchanges in a magnetic field in
order to probe if even a minute concentration of magnetic impurities could
indeed contribute efficiently to energy exchanges.
Thursday, June 5th 2003, 15:30
Ernest Rutherford Physics Building, R.E. Bell Conference Room (room 103)
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