Journal
PHYSICAL REVIEW B
Volume 86, Issue 13, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.86.134414
Keywords
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Funding
- Triangle de la physique [2007-36, ANR-06-BLAN-0218, ECS-0608842, ARO W911-09-1-0395, DARPA HR0011-09-1-0009]
- Institute of Quantum Information under NSF Grant [PHY-0803371]
- Agence Nationale de la Recherche (ANR) [ANR-06-BLAN-0218] Funding Source: Agence Nationale de la Recherche (ANR)
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We develop a technique to compute the high-frequency asymptotics of spin correlators in weakly interacting disordered spin systems. We show that the dynamical spin correlator decreases exponentially at high frequencies < SS >(omega) similar to exp(-tau(*)omega) and compute the characteristic time tau* of this dependence. In a typical random configuration, some fraction of spins form strongly coupled pairs, which behave as two- level systems. Their switching dynamics is driven by the high- frequency noise from the surrounding spins, resulting in low- frequency 1/f noise in the magnetic susceptibility and other physical quantities. We discuss application of these results to the problem of susceptibility and flux noise in superconducting circuits at mK temperatures.
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