Magnetic Field Dependent Tunneling in Glasses

Details Magnetic Field Dependent Tunneling in Glasses Magnetic Field Dependent Tunneling in Glasses

1999-09-29

arxiv.org/abs/cond-mat/9909425v1

Physics

Condensed Matter

4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.84.1938

We report on experiments giving evidence for quantum effects of electromagnetic flux in barium alumosilicate glass. In contrast to expectation, below 100 mK the dielectric response becomes sensitive to magnetic fields. The experimental findings include both, the complete lifting of the dielectric saturation by weak magnetic fields and oscillations of the dielectric response in the low temperature resonant regime. As origin of these effects we suggest that the magnetic induction field violates the time reversal invariance leading to a flux periodicity in the energy levels of tunneling systems. At low temperatures, this effect is strongly enhanced by the interaction between tunneling systems and thus becomes measurable.

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