Physics – Condensed Matter – Disordered Systems and Neural Networks
Scientific paper
2005-03-06
Phys. Rev. B, 72, 024203 (2005).
Physics
Condensed Matter
Disordered Systems and Neural Networks
8 pages, 7 figures
Scientific paper
10.1103/PhysRevB.72.024203
The anomalous response of glasses in the echo amplitude experiment is explained in the presence of a magnetic field. We have considered the low energy excitations in terms of an effective two level system. The effective model is constructed on the flip-flop configuration of two interacting two level systems. The magnetic field affects the tunneling amplitude through the Aharanov-Bohm effect. The effective model has a lower scale of energy in addition to the new distribution of tunneling parameters which depend on the interaction. We are able to explain some features of echo amplitude versus a magnetic field, namely, the dephasing effect at low magnetic fields, dependence on the strength of the electric field, pulse separation effect and the influence of temperature. However this model fails to explain the isotope effects which essentially can be explained by the nuclear quadrupole moment. We will finally discuss the features of our results.
Akbari Ali
Langari A.
No associations
LandOfFree
The effect of Aharanov-Bohm phase on the magnetic-field dependence of two-pulse echos in glasses at low temperatures does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with The effect of Aharanov-Bohm phase on the magnetic-field dependence of two-pulse echos in glasses at low temperatures, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The effect of Aharanov-Bohm phase on the magnetic-field dependence of two-pulse echos in glasses at low temperatures will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-88442