2005
DOI: 10.1103/physrevb.72.024203
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Effect of the Aharanov-Bohm phase on the magnetic-field dependence of two-pulse echoes in glasses at low temperatures

Abstract: 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… Show more

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Cited by 5 publications
(4 citation statements)
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References 34 publications
(57 reference statements)
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“…The absence of a magnetoacoustic response in such glasses with ATS can be understood in terms of the much higher resonance frequencies of the NM-pockets and channels, and experiments should be done in such conditions. As for the PE-experiments, the orbital-coupling approach with the inclusion of TS-TS interactions has been shown to provide a partial explanation for the B-dependence of the PE-amplitude at ultralow temperatures [18]. The present theory, interaction improved, is expected to also provide an explanation for such data, the so-called isotope effect [8] being, possibly, fabrication-rather than isotope-related.…”
mentioning
confidence: 66%
“…The absence of a magnetoacoustic response in such glasses with ATS can be understood in terms of the much higher resonance frequencies of the NM-pockets and channels, and experiments should be done in such conditions. As for the PE-experiments, the orbital-coupling approach with the inclusion of TS-TS interactions has been shown to provide a partial explanation for the B-dependence of the PE-amplitude at ultralow temperatures [18]. The present theory, interaction improved, is expected to also provide an explanation for such data, the so-called isotope effect [8] being, possibly, fabrication-rather than isotope-related.…”
mentioning
confidence: 66%
“…All theoretical models that have been proposed to explain the above-mentioned magnetic anomalies are based on modifications of the standard tunnelling model [3], leading to the Bdependence of the energy spectrum of a certain subsystem of TS ensemble. These models and their applications are described in [4,8,[10][11][12][13][14][15].…”
Section: Figurementioning
confidence: 99%
“…Several generalizations of the standard TLS model have been reported after the anomalous behavior of glasses in a magnetic field. According to these solutions, the models can be divided into "orbital" 10,11,12,13 and "spin" models (nuclear quadrupole effect) 14,15,16,17 . The "orbital" models can provide an explanation for some of the magnetic field effects by considering the flux dependence of the tunneling splitting.…”
Section: Introductionmentioning
confidence: 99%